Ensure the current frame is not lost during testing of whether a style
update is needed.

BUG=315889

Review URL: https://codereview.chromium.org/109263007

git-svn-id: svn://svn.chromium.org/blink/trunk@164006 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Generate existing casting functions with DEFINE_TYPE_CASTS macro.

* Rename toPluginContainerImpl to toWebPluginContainerImpl for consistency.
* Remove unnecessary WebViewImpl->WebViewImpl casts.

BUG=309516

Review URL: https://codereview.chromium.org/105943008

git-svn-id: svn://svn.chromium.org/blink/trunk@164007 bbb929c8-8fbe-4397-9dbb-9b2b20218538
Add Oilpan HeapContainsCache, HeapStats, FreeListEntry, HeapPage,
ThreadHeap and Visitor.

Stub out parts of the implementation to not have to drag in even more.

BUG=

Review URL: https://codereview.chromium.org/113973004

git-svn-id: svn://svn.chromium.org/blink/trunk@164008 bbb929c8-8fbe-4397-9dbb-9b2b20218538