PCScan: Allocate mojo::Channel on non-scannable partition
The CL introduces a non-scannable partition, the purpose of which is to exclude objects that are known to not contain pointers and thereby speed up the scanning. mojo::Channel::Message is currently the only type, allocation of which is moved to the new partition. All mojo messages amount to roughly 4-5% of the overall browser memory (tested in cnn:2020). Bug: 11297512 Change-Id: I0159f7c01d36174cba54f710a82aa86672862efc Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2678949 Commit-Queue: Anton Bikineev <bikineev@chromium.org> Reviewed-by:Bartek Nowierski <bartekn@chromium.org> Reviewed-by:
Benoit L <lizeb@chromium.org> Reviewed-by:
Daniel Cheng <dcheng@chromium.org> Reviewed-by:
Kentaro Hara <haraken@chromium.org> Reviewed-by:
Michael Lippautz <mlippautz@chromium.org> Cr-Commit-Position: refs/heads/master@{#859600}
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