[animation-trigger] Make TimelineTrigger support multiple timelines [chromium/src : main]

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AI Code Reviewer (Gerrit)

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Jan 6, 2026, 3:31:48 PM (5 days ago) Jan 6
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File third_party/blink/renderer/core/animation/timeline_trigger.h
Line 63, Patchset 1 (Latest): AnimationTimeline* GetTimelineInternal() {
AI Code Reviewer . unresolved

nit: Precede setters with the word “Set”; use bare words for getters. Consider renaming 'GetTimelineInternal' to 'TimelineInternal' as there is no naming conflict with a type. (Blink Style Guide: Naming - Precede setters with the word “Set”; use bare words for getters)

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File third_party/blink/renderer/core/animation/timeline_trigger_range.h
Line 60, Patchset 1 (Latest): AnimationTimeline* GetTimelineInternal() { return timeline_.Get(); }
AI Code Reviewer . unresolved

nit: Precede setters with the word “Set”; use bare words for getters. Consider renaming 'GetTimelineInternal' to 'TimelineInternal' as there is no naming conflict with a type. (Blink Style Guide: Naming - Precede setters with the word “Set”; use bare words for getters)

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Jan 7, 2026, 12:03:27 PM (4 days ago) Jan 7
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AI Code Reviewer added 2 comments

File third_party/blink/renderer/core/animation/timeline_trigger.h
Line 30, Patchset 1 (Latest): TimelineTrigger(const Member<TimelineTriggerRanges>& ranges,
AI Code Reviewer . unresolved

nit: Prefer raw pointers for function parameters. `Member<T>` is intended for class member variables. Use `TimelineTriggerRanges*` instead of `const Member<TimelineTriggerRanges>&`.

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File third_party/blink/renderer/core/animation/timeline_trigger.cc
Line 334, Patchset 1 (Latest):TimelineTrigger::TimelineTrigger(const Member<TimelineTriggerRanges>& ranges,
AI Code Reviewer . unresolved

nit: Prefer raw pointers for function parameters. `Member<T>` is intended for class member variables. Use `TimelineTriggerRanges*` instead of `const Member<TimelineTriggerRanges>&`.

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David Awogbemila (Gerrit)

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2 comments

File third_party/blink/renderer/core/animation/timeline_trigger.h
Line 30, Patchset 1: TimelineTrigger(const Member<TimelineTriggerRanges>& ranges,
AI Code Reviewer . resolved

nit: Prefer raw pointers for function parameters. `Member<T>` is intended for class member variables. Use `TimelineTriggerRanges*` instead of `const Member<TimelineTriggerRanges>&`.

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David Awogbemila

Acknowledged. Pre-existing function; will consider renaming in future patch.

File third_party/blink/renderer/core/animation/timeline_trigger.cc
Line 334, Patchset 1:TimelineTrigger::TimelineTrigger(const Member<TimelineTriggerRanges>& ranges,
AI Code Reviewer . resolved

nit: Prefer raw pointers for function parameters. `Member<T>` is intended for class member variables. Use `TimelineTriggerRanges*` instead of `const Member<TimelineTriggerRanges>&`.

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David Awogbemila

Acknowledged. Will fix.

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    Robert Flack (Gerrit)

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    Jan 8, 2026, 10:49:44 AM (3 days ago) Jan 8
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    Commit Message
    Line 12, Patchset 4 (Latest):(I'll delete this from the description: timeline_trigger_range.cc is empty in this patch because I left the implementation of TimelineTriggerRange in timeline_trigger.cc as that may make it easier to see what code is actually changing; I had originally separated the implementation in https://chromium-review.googlesource.com/c/chromium/src/+/7365245)
    Robert Flack . unresolved

    Thanks, please move the implementation over for landing. You can always leave a note like this as a file comment on the file.

    File third_party/blink/renderer/core/animation/timeline_trigger.idl
    Line 21, Patchset 4 (Latest):] interface TimelineTriggerRanges {
    Robert Flack . unresolved

    We tend to not pluralist type names - maybe call this TimelineTriggerRangeList similar to NodeList.

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      Robert Flack (Gerrit)

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      File third_party/blink/renderer/core/animation/timeline_trigger.idl
      Line 23, Patchset 4 (Latest): getter TimelineTriggerRange item(unsigned long index);
      Robert Flack . unresolved

      Also add `iterable<TimelineTriggerRange>;` as we should be able to iterate through the ranges in this type.

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      David Awogbemila (Gerrit)

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      Commit Message
      Line 12, Patchset 4:(I'll delete this from the description: timeline_trigger_range.cc is empty in this patch because I left the implementation of TimelineTriggerRange in timeline_trigger.cc as that may make it easier to see what code is actually changing; I had originally separated the implementation in https://chromium-review.googlesource.com/c/chromium/src/+/7365245)
      Robert Flack . resolved

      Thanks, please move the implementation over for landing. You can always leave a note like this as a file comment on the file.

      David Awogbemila

      Ack. Will do.

      File third_party/blink/renderer/core/animation/timeline_trigger.idl
      Line 21, Patchset 4:] interface TimelineTriggerRanges {
      Robert Flack . resolved

      We tend to not pluralist type names - maybe call this TimelineTriggerRangeList similar to NodeList.

      David Awogbemila

      Sounds good. Done.

      Line 23, Patchset 4: getter TimelineTriggerRange item(unsigned long index);
      Robert Flack . resolved

      Also add `iterable<TimelineTriggerRange>;` as we should be able to iterate through the ranges in this type.

      David Awogbemila

      Done

      File third_party/blink/renderer/core/animation/timeline_trigger_range.cc
      Line 7, Patchset 7 (Latest):namespace blink {} // namespace blink
      David Awogbemila . resolved

      For ease of review, the implementation of
      TimelineTriggerRange is left in timeline_trigger.cc as it is mostly a copy
      of code that was previously implemented in TimelineTrigger. The code will
      be moved here before landing.

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        Robert Flack (Gerrit)

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        David Awogbemila (Gerrit)

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          Gerrit-Owner: David Awogbemila <awogb...@chromium.org>
          Gerrit-Reviewer: David Awogbemila <awogb...@chromium.org>
          Gerrit-Reviewer: Robert Flack <fla...@chromium.org>
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          Gerrit-CC: Blink W3C Test Autoroller <blink-w3c-te...@chromium.org>
          Gerrit-CC: Kentaro Hara <har...@chromium.org>
          Gerrit-CC: Menard, Alexis <alexis...@intel.com>
          Gerrit-CC: Olga Gerchikov <gerc...@microsoft.com>
          Gerrit-CC: Raphael Kubo da Costa <ku...@igalia.com>
          Gerrit-Comment-Date: Fri, 09 Jan 2026 17:02:16 +0000
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          Chromium LUCI CQ (Gerrit)

          unread,
          Jan 9, 2026, 12:58:38 PM (2 days ago) Jan 9
          to David Awogbemila, Blink W3C Test Autoroller, Robert Flack, AyeAye, AI Code Reviewer, Menard, Alexis, chromium...@chromium.org, Olga Gerchikov, Kentaro Hara, Raphael Kubo da Costa, cblume...@chromium.org, penghuan...@chromium.org, android-web...@chromium.org, ashleynewson+w...@chromium.org, blink-revie...@chromium.org, blink-revie...@chromium.org, blink-revie...@chromium.org, blink-...@chromium.org, jmedle...@chromium.org

          Chromium LUCI CQ submitted the change

          Change information

          Commit message:
          [animation-trigger] Make TimelineTrigger support multiple timelines

          We got a resolution[1] to future-proof the TimelineTrigger interface
          towards supporting multiple timelines. This cl makes this change.


          (I'll delete this from the description: timeline_trigger_range.cc is empty in this patch because I left the implementation of TimelineTriggerRange in timeline_trigger.cc as that may make it easier to see what code is actually changing; I had originally separated the implementation in https://chromium-review.googlesource.com/c/chromium/src/+/7365245)

          Bug: 390314945, 473568234
          Change-Id: Ia8026d9fb5b8e9b5598a4d7af76169bcc68c5d7e
          Reviewed-by: Robert Flack <fla...@chromium.org>
          Reviewed-by: David Awogbemila <awogb...@chromium.org>
          Commit-Queue: David Awogbemila <awogb...@chromium.org>
          Cr-Commit-Position: refs/heads/main@{#1567022}
          Files:
          • M android_webview/test/data/web_tests/webexposed/global-interface-listing-expected.txt
          • M third_party/blink/renderer/bindings/generated_in_core.gni
          • M third_party/blink/renderer/core/animation/BUILD.gn
          • M third_party/blink/renderer/core/animation/animation_test.cc
          • M third_party/blink/renderer/core/animation/animation_trigger_test.cc
          • M third_party/blink/renderer/core/animation/css/css_animations.cc
          • M third_party/blink/renderer/core/animation/css/css_animations_test.cc
          • M third_party/blink/renderer/core/animation/timeline_trigger.cc
          • M third_party/blink/renderer/core/animation/timeline_trigger.h
          • M third_party/blink/renderer/core/animation/timeline_trigger.idl
          • A third_party/blink/renderer/core/animation/timeline_trigger_range.cc
          • A third_party/blink/renderer/core/animation/timeline_trigger_range.h
          • A third_party/blink/renderer/core/animation/timeline_trigger_range_list.cc
          • A third_party/blink/renderer/core/animation/timeline_trigger_range_list.h
          • M third_party/blink/web_tests/external/wpt/scroll-animations/animation-trigger/animation-trigger-addAnimation.tentative.html
          • M third_party/blink/web_tests/external/wpt/scroll-animations/animation-trigger/animation-trigger-disarmed-by-apis.tentative.html
          • M third_party/blink/web_tests/external/wpt/scroll-animations/animation-trigger/animation-trigger-multiple-animations.tentative.html
          • M third_party/blink/web_tests/external/wpt/scroll-animations/animation-trigger/animation-trigger-multiple-triggers.tentative.html
          • M third_party/blink/web_tests/external/wpt/scroll-animations/animation-trigger/animation-trigger-range-px-roundtrip.tentative.html
          • M third_party/blink/web_tests/external/wpt/scroll-animations/animation-trigger/support/support.js
          • M third_party/blink/web_tests/external/wpt/web-animations/interfaces/TimelineTrigger/constructor.html
          • M third_party/blink/web_tests/webexposed/global-interface-listing-expected.txt
          Change size: XL
          Delta: 22 files changed, 803 insertions(+), 455 deletions(-)
          Branch: refs/heads/main
          Submit Requirements:
          • requirement satisfiedCode-Review: +1 by Robert Flack, +1 by David Awogbemila
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          Gerrit-MessageType: merged
          Gerrit-Project: chromium/src
          Gerrit-Branch: main
          Gerrit-Change-Id: Ia8026d9fb5b8e9b5598a4d7af76169bcc68c5d7e
          Gerrit-Change-Number: 7399329
          Gerrit-PatchSet: 12
          Gerrit-Owner: David Awogbemila <awogb...@chromium.org>
          Gerrit-Reviewer: Chromium LUCI CQ <chromiu...@luci-project-accounts.iam.gserviceaccount.com>
          Gerrit-Reviewer: David Awogbemila <awogb...@chromium.org>
          Gerrit-Reviewer: Robert Flack <fla...@chromium.org>
          Gerrit-CC: AI Code Reviewer <peep-gen...@system.gserviceaccount.com>
          Gerrit-CC: Blink W3C Test Autoroller <blink-w3c-te...@chromium.org>
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          Blink W3C Test Autoroller (Gerrit)

          unread,
          Jan 9, 2026, 2:17:49 PM (2 days ago) Jan 9
          to David Awogbemila, Chromium LUCI CQ, Robert Flack, AyeAye, AI Code Reviewer, Menard, Alexis, chromium...@chromium.org, Olga Gerchikov, Kentaro Hara, Raphael Kubo da Costa, cblume...@chromium.org, penghuan...@chromium.org, android-web...@chromium.org, ashleynewson+w...@chromium.org, blink-revie...@chromium.org, blink-revie...@chromium.org, blink-revie...@chromium.org, blink-...@chromium.org, jmedle...@chromium.org

          Message from Blink W3C Test Autoroller

          The WPT PR for this CL has been merged upstream! https://github.com/web-platform-tests/wpt/pull/57110

          Open in Gerrit

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          Gerrit-MessageType: comment
          Gerrit-Project: chromium/src
          Gerrit-Branch: main
          Gerrit-Change-Id: Ia8026d9fb5b8e9b5598a4d7af76169bcc68c5d7e
          Gerrit-Change-Number: 7399329
          Gerrit-PatchSet: 12
          Gerrit-Owner: David Awogbemila <awogb...@chromium.org>
          Gerrit-Reviewer: Chromium LUCI CQ <chromiu...@luci-project-accounts.iam.gserviceaccount.com>
          Gerrit-Reviewer: David Awogbemila <awogb...@chromium.org>
          Gerrit-Reviewer: Robert Flack <fla...@chromium.org>
          Gerrit-CC: AI Code Reviewer <peep-gen...@system.gserviceaccount.com>
          Gerrit-CC: Blink W3C Test Autoroller <blink-w3c-te...@chromium.org>
          Gerrit-CC: Kentaro Hara <har...@chromium.org>
          Gerrit-CC: Menard, Alexis <alexis...@intel.com>
          Gerrit-CC: Olga Gerchikov <gerc...@microsoft.com>
          Gerrit-CC: Raphael Kubo da Costa <ku...@igalia.com>
          Gerrit-Comment-Date: Fri, 09 Jan 2026 19:17:43 +0000
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