cc : Fix transform calculation bug while calculating clip rects

cc : Fix transform calculation bug while calculating clip rects

The bug is while calculating the transform from a clip parent's target
to clip child's target. We weren't taking into account the surface
contents scale at both targets. This CL fixes that.
Also verified that the new clip rects path (which is behind a flag)
doesn't have this bug, we do the correct scaling there already.

BUG=693213
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2712053002
Cr-Commit-Position: refs/heads/master@{#452987}
(cherry picked from commit 264a0dd42bb8612ab0d2d60645e722a7758b013e)

Review-Url: https://codereview.chromium.org/2715243008 .
Cr-Commit-Position: refs/branch-heads/2987@{#709}
Cr-Branched-From: ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed: https://chromium.googlesource.com/chromium/src/+/cc9450f1ad81cda200b6c1a42a2348d80753a0d6

[jaydasika, 2017-02-28 00:59:34]

Description was changed from

==========
cc : Fix transform calculation bug while calculating clip rects

The bug is while calculating the transform from a clip parent's target
to clip child's target. We weren't taking into account the surface
contents scale at both targets. This CL fixes that.
Also verified that the new clip rects path (which is behind a flag)
doesn't have this bug, we do the correct scaling there already.

BUG=693213
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2712053002
Cr-Commit-Position: refs/heads/master@{#452987}
(cherry picked from commit 264a0dd42bb8612ab0d2d60645e722a7758b013e)
==========

to

==========
cc : Fix transform calculation bug while calculating clip rects

The bug is while calculating the transform from a clip parent's target
to clip child's target. We weren't taking into account the surface
contents scale at both targets. This CL fixes that.
Also verified that the new clip rects path (which is behind a flag)
doesn't have this bug, we do the correct scaling there already.

BUG=693213
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_trusty_blink_rel

Review-Url: https://codereview.chromium.org/2712053002
Cr-Commit-Position: refs/heads/master@{#452987}
(cherry picked from commit 264a0dd42bb8612ab0d2d60645e722a7758b013e)

Review-Url: https://codereview.chromium.org/2715243008 .
Cr-Commit-Position: refs/branch-heads/2987@{#709}
Cr-Branched-From:
ad51088c0e8776e8dcd963dbe752c4035ba6dab6-refs/heads/master@{#444943}
Committed:
https://chromium.googlesource.com/chromium/src/+/cc9450f1ad81cda200b6c1a42a23...
==========

[jaydasika, 2017-02-28 00:59:35]

Committed patchset #1 (id:1) manually as
cc9450f1ad81cda200b6c1a42a2348d80753a0d6.