GitLab

This patch adds a new Blink feature flag - BloatedRendererDetection.
When the flag is enabled, Blink uses the new V8 API to install
a callback that is invoked when V8's heap reaches the heap limit.

The callback notifies the BloatedRendererDetector controller that in
future will dispatch a message to the browser process for reloading the
tab and showing an infobar explaining that the tab ran out of memory.

The patch also adds a new UMA histograms
- "BloatedRenderer.V8.NearV8HeapLimitHandling"

Bug: 835806
Change-Id: I2f1bcefaaf8a553517de9a1bb2dc9d084f4eca4b
Reviewed-on: https://chromium-review.googlesource.com/1024033
Commit-Queue: Ulan Degenbaev <ulan@chromium.org>
Reviewed-by: Mark Pearson <mpearson@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Cr-Commit-Position: refs/heads/master@{#558275}