Building v8_context_snapshot.bin

[geo...@amazon.com]

I recently upleveled my workspace  and noticed when I run headless_shell I am getting an error like
#
# Fatal error in ../../v8/src/api.cc, line 8410
# Check failed: (isolate->snapshot_blob()) == nullptr.
#
which will cause my headless_shell to segfault.
I noticed that adding in a build flag use_v8_context_snapshot=false seemed to allow me to run the headless shell without issue.
I generated the v8_context_snapshot by building v8_context_snapshot_generator and running it pointing to the root of my output directory to generate the v8_context_snapshot.bin and everything seems to work.
What exactly is the purpose of this file? Is this the correct way to generate it? I have a headless_lib.pak file also in the root, which if I am not mistaken contains the snapshot_blob.bin that this file is generated from.

[Sami Kyostila]

Usually headless_shell is meant to be used with use_v8_context_snapshot=false (see build/args/headless.gn). However making the shell work with external v8 resources is pretty straightforward so I've uploaded a patch to do that: https://chromium-review.googlesource.com/c/chromium/src/+/906750

- Sami

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