Is there a way to change browser FPS from 60 to 30?

[Site Mao]

Interested in doing this for testing reasons on chrome shell.

I've attempted just a few things:

I've tried adjusting the default value of renderer_settings.cc, tried modifying the interval in begin_frame_source.cc, I've tried modifying kDefaultRefreshRate in compositor.cc, and I've tried adjusting the DefaultInterval() inside begin_frame_args.cc.

In addition, I've also tried modifying VSyncMonitor.java to skip half the "doFrame()"s. This breaks the renderer and I need to do some investigation into what is going on.

Has anybody tried this before? Does anybody have a working way to adjust the FPS?

[Dana Jansens]

+brianderson would know

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[Brian C. Anderson]

I put together a hacky patch, which should work on all platforms, and verified it on my local machine:

https://codereview.chromium.org/1101603003

It does the following:

1) Add begin_frame_count_ to cc::Scheduler

2) If !Scheduler::settings_::main_thread_should_always_be_low_latency, then...

3) Increment begin_frame_count_ at the start of Scheduler::OnBeginFrameMixInDelegate and use it to skip some frames by returning early.

Scheduler::settings_::main_thread_should_always_be_low_latency being false is an indirect way of detecting if you are in the Renderer.

[Site Mao]

Hi Brian.

Thanks for the patch. It worked for me.