Correction:
In step 1: Freshly launch chrome browser to reproduce the issue.

Manual regression range:
Good Build: 52.0.2725.0
Bad Build:  52.0.2726.0

Narrow Bisect:
https://chromium.googlesource.com/chromium/src/+log/931c0e91a7501df49fb488d978e64e1632cef37a..575a9b96a2b2776a6a4ae81f2e20c2bf3e975250?pretty=fuller&n=10

Suspecting: r391733 

Note: Issue not seen on Win & Linux OS.

Deleted: ActualPdf.png 279 KB

	ActualPdf.png 279 KB View Download

Deleted: Actual_Pdf.mov 1.1 MB

Actual_Pdf.mov 1.1 MB Download

Deleted: Expected_Pdf.mov 1.0 MB

Expected_Pdf.mov 1.0 MB Download

Note:
Similarly issue is seen on gmail.com and traces of previously open page appears on dev tools window.

Please refer attached screencast.

Deleted: Actual_gmail.mov 3.4 MB

Actual_gmail.mov 3.4 MB Download

Deleted: Actual_Traces.mov 2.6 MB

Actual_Traces.mov 2.6 MB Download

Marking the above issue as RB-BETA as this is a recent regression and this affect dev tool.

Feel free to lower if someone feels otherwise.

Thank you!

Update: Marking the above issue as Dev blocker as this is seen on variety of sites where there are embedded videos on facebook and other sites, blank screen is observed or huge flickering is observed on the same.  This is affecting Google services like Gmail, when clicked on name icon in gmail page gets displayed with white screen.

I have attach the video for the same.  Feel free to lower if someone feels otherwise.

Thank you!

Deleted: Rendering not proper for embedded video.mp4 8.0 MB

Rendering not proper for embedded video.mp4 8.0 MB Download

John, could you please get the CL reverted if its the real culprit.

Marking as 'ReleaseBlock-Beta' as this is impacting Mac OS X only.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/fef422a0e8492b766d0713d9a6f5e3298c563081

commit fef422a0e8492b766d0713d9a6f5e3298c563081
Author: jbauman <jbauman@chromium.org>
Date: Mon May 09 22:17:45 2016

Revert of Correctly handle damage involving filters in SurfaceAggregator (patchset #6 id:100001 of https://codereview.chromium.org/1927413002/ )

Reason for revert:
Seems to cause rendering issues on mac.

BUG= 610181 

Original issue's description:
> Correctly handle damage involving filters in SurfaceAggregator
>
> There are two main issues with the handling of damage of contents
> affected by RenderPassDrawQuad filters:
> 1) Damage of a small part of a source Surface can affect a large part
> of the destination and
> 2) To draw damage on the destination, an unexpectedly large portion
> of the source must be used.
>
> To deal with these, the SurfaceAggregator must keep track of all output
> render passes affected by filters. Any Surface in an affected RenderPass
> will cause its parent Surface to be completely damaged (handling #1
> above).
>
> To handle #2, affected RenderPasses will have their damage rects set to
> contain the entire output_rect. Then DirectRenderer can use that damage
> rect to determine what to draw.
>
> CopyRequests can also cause areas outside the damage rect to be read, so
> any RenderPass inside a CopyRequest (directly or indirectly) will have
> its damage rect set to the output rect.
>
> This system is very pessimistic about what should be drawn, but in
> general it shouldn't affect that many cases and should always be
> correct.
>
> BUG= 602941 
> CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel
>
> Committed: https://crrev.com/575a9b96a2b2776a6a4ae81f2e20c2bf3e975250
> Cr-Commit-Position: refs/heads/master@{#391733}

TBR=piman@chromium.org
# Not skipping CQ checks because original CL landed more than 1 days ago.
BUG= 602941 

Review-Url: https://codereview.chromium.org/1963693003
Cr-Commit-Position: refs/heads/master@{#392445}

[modify] https://crrev.com/fef422a0e8492b766d0713d9a6f5e3298c563081/cc/output/direct_renderer.cc
[modify] https://crrev.com/fef422a0e8492b766d0713d9a6f5e3298c563081/cc/surfaces/surface_aggregator.cc
[modify] https://crrev.com/fef422a0e8492b766d0713d9a6f5e3298c563081/cc/surfaces/surface_aggregator.h
[modify] https://crrev.com/fef422a0e8492b766d0713d9a6f5e3298c563081/cc/surfaces/surface_aggregator_unittest.cc
[modify] https://crrev.com/fef422a0e8492b766d0713d9a6f5e3298c563081/cc/trees/layer_tree_host_impl.cc

Thanks for the revert, could you please revert the patch in 2729 branch.