The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/b4de20aaeabfe3d6476d9d431992079c9d09486a

commit b4de20aaeabfe3d6476d9d431992079c9d09486a
Author: bashi <bashi@chromium.org>
Date: Mon Apr 10 03:09:28 2017

bindings: Pass is_null flag to attribute setters when they are nullable

Some types can express null by itself (e.g. pointers) but some others
are not (e.g. bool). Ideally we should wrap these types with Nullable<T>
to make it nullable. However, changing to use Nullable<T> requires a lot
of changes in the binding layer. As a workaround, use a flag to indicate
it is null or not.

BUG= 709833 

Review-Url: https://codereview.chromium.org/2809543002
Cr-Commit-Position: refs/heads/master@{#463169}

[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/bindings/scripts/v8_attributes.py
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/bindings/templates/attributes.cpp.tmpl
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/bindings/tests/idls/core/TestObject.idl
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/bindings/tests/results/core/V8TestObject.h
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/Animation.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/Animation.h
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/AnimationTest.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/AnimationTimeline.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/AnimationTimeline.h
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/AnimationTimelineTest.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/EffectStackTest.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/animation/css/CSSAnimations.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/html/HTMLInputElement.cpp
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/html/HTMLInputElement.h
[modify] https://crrev.com/b4de20aaeabfe3d6476d9d431992079c9d09486a/third_party/WebKit/Source/core/inspector/InspectorAnimationAgent.cpp