The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/0787b78381f3abb74a078bde05a6084bf0ed8d2c

commit 0787b78381f3abb74a078bde05a6084bf0ed8d2c
Author: keishi <keishi@chromium.org>
Date: Tue Jun 27 07:03:42 2017

Low memory page navigation GC for low end devices

Until now we have avoided running GCs during page loads but for low end devices in low memory situations we should do a page navigation GC to reduce peak memory usage. system_health.memory_mobile showed that we can expect >10MB peak RSS reduction on certain sites.

Design doc: https://docs.google.com/document/d/13f25LGfpWWOOWk9U44it9Gva6i4JRsrQDlnxAJeSEZo/edit?usp=sharing

BUG=732664

Review-Url: https://codereview.chromium.org/2948983002
Cr-Commit-Position: refs/heads/master@{#482556}

[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/LocalWindowProxy.h
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/RemoteWindowProxy.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/RemoteWindowProxy.h
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/V8GCForContextDispose.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/V8GCForContextDispose.h
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/WindowProxy.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/WindowProxy.h
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/WindowProxyManager.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/bindings/core/v8/WindowProxyManager.h
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/core/exported/WebFrame.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/core/exported/WebMemoryStatistics.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/platform/wtf/allocator/Partitions.cpp
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/third_party/WebKit/Source/platform/wtf/allocator/Partitions.h
[modify] https://crrev.com/0787b78381f3abb74a078bde05a6084bf0ed8d2c/tools/metrics/histograms/histograms.xml