Automatically applying components based on crash stacktrace and information from OWNERS files.

If this is incorrect, please apply the Test-Predator-Wrong-Components label.

Automatically assigning owner based on suspected regression changelist https://chromium.googlesource.com/chromium/src/+/635201011d3d7c4cccad0f31a571a153e3cf5694 (Add implicit rootScroller feature).

If this is incorrect, please remove the owner and apply the Test-Predator-Wrong-CLs label.

FYI: The patch in question has been reverted for other reasons. I'll make sure to fix this before relanding though.

ClusterFuzz has detected this issue as fixed in range 527329:527330.

Detailed report: https://clusterfuzz.com/testcase?key=4779360384188416

Fuzzer: inferno_twister_c
Job Type: linux_ubsan_vptr_content_shell_drt
Platform Id: linux

Crash Type: Null-dereference READ
Crash Address: 0x000000000000
Crash State:
  blink::LocalFrameView::UpdateGeometry
  blink::RootScrollerController::UpdateIFrameGeometryAndLayoutSize
  blink::RootScrollerController::RecomputeEffectiveRootScroller
  
Sanitizer: undefined (UBSAN)

Regressed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=527280:527281
Fixed: https://clusterfuzz.com/revisions?job=linux_ubsan_vptr_content_shell_drt&range=527329:527330

Reproducer Testcase: https://clusterfuzz.com/download?testcase_id=4779360384188416

See https://github.com/google/clusterfuzz-tools for more information.

If you suspect that the result above is incorrect, try re-doing that job on the test case report page.

ClusterFuzz testcase 4779360384188416 is verified as fixed, so closing issue as verified.

If this is incorrect, please add ClusterFuzz-Wrong label and re-open the issue.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/3f0b9946f52dc4e146e90e7377974e12a76404b5

commit 3f0b9946f52dc4e146e90e7377974e12a76404b5
Author: David Bokan <bokan@chromium.org>
Date: Mon Jan 22 15:29:23 2018

Fix rootScroller when iframe's view is swapped.

This CL fixes an issue when the rootScroller is set to an iframe. An
iframe is a special case for rootScroller and requires some changes to
be made on the FrameView. This happens in
RootScrollerController::ApplyRootScrollerProperties. However, in some
cases, when the iframe is navigated we can end up swapping the FrameView
used by the Frame. Currently, we don't call ApplyRootScrollerProperties
on it since the effective rootScroller in the parent document hasn't
changed.

This CL adds a hook in HTMLFrameOwnerElement to let the
RootScrollerController know that it needs to reapply any properties
on the FrameView. I added a test set-rootscroller-before-load.html that
exercises this case.

A related change also fixes  issue 799577  which is caused by differences
in (frame_owner->ContentFrame())->View() and
frame_owner->OwnedEmbeddedContentView(). This CL change
ApplyRootScrollerProperties to use the latter.

I also made a small change to the older nested-rootscroller* tests to
deflake them.

Bug:  798719 ,  799577 
Change-Id: I1c1ba8ed3d2be80fbbfbb16e8c17e1734b066801
Reviewed-on: https://chromium-review.googlesource.com/867652
Commit-Queue: David Bokan <bokan@chromium.org>
Reviewed-by: Steve Kobes <skobes@chromium.org>
Cr-Commit-Position: refs/heads/master@{#530868}
[add] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/LayoutTests/rootscroller/set-rootscroller-before-load-expected.html
[add] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/LayoutTests/rootscroller/set-rootscroller-before-load.html
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/LayoutTests/virtual/android/rootscroller/nested-rootscroller-browser-controls-bounds-hidden.html
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/LayoutTests/virtual/android/rootscroller/nested-rootscroller-browser-controls-bounds-shown.html
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/Source/core/html/HTMLFrameOwnerElement.cpp
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/Source/core/page/scrolling/RootScrollerController.cpp
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/Source/core/page/scrolling/RootScrollerController.h
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/Source/core/page/scrolling/TopDocumentRootScrollerController.cpp
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/Source/core/testing/Internals.cpp
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/Source/core/testing/Internals.h
[modify] https://crrev.com/3f0b9946f52dc4e146e90e7377974e12a76404b5/third_party/WebKit/Source/core/testing/Internals.idl