Fix frame coordinate translation issue with scroll views.

Fix frame coordinate translation issue with scroll views.

The absolute position was being used (which is in content coordinates)
but we were passing the root frame coordinates in. Translate the root
frame coordinates into content coordinates before applying the transform
from the LayoutObject. This matches the implementation of
RootFrameToLocalPoint methods.

BUG=710165
Review-Url: https://codereview.chromium.org/2814473003
Cr-Commit-Position: refs/heads/master@{#464170}
(cherry picked from commit d99b8375dd7a1f9f69f8bcc5bde50ad2669b2b72)

Review-Url: https://codereview.chromium.org/2813903006 .
Cr-Commit-Position: refs/branch-heads/3029@{#695}
Cr-Branched-From: 939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed: https://chromium.googlesource.com/chromium/src/+/e64f95fdc842b8a37fa12ab375f82805f87f32d0

[dtapuska, 2017-04-13 19:48:55]

Description was changed from

==========
Fix frame coordinate translation issue with scroll views.

The absolute position was being used (which is in content coordinates)
but we were passing the root frame coordinates in. Translate the root
frame coordinates into content coordinates before applying the transform
from the LayoutObject. This matches the implementation of
RootFrameToLocalPoint methods.

BUG=710165

Review-Url: https://codereview.chromium.org/2814473003
Cr-Commit-Position: refs/heads/master@{#464170}
(cherry picked from commit d99b8375dd7a1f9f69f8bcc5bde50ad2669b2b72)
==========

to

==========
Fix frame coordinate translation issue with scroll views.

The absolute position was being used (which is in content coordinates)
but we were passing the root frame coordinates in. Translate the root
frame coordinates into content coordinates before applying the transform
from the LayoutObject. This matches the implementation of
RootFrameToLocalPoint methods.

BUG=710165

Review-Url: https://codereview.chromium.org/2814473003
Cr-Commit-Position: refs/heads/master@{#464170}
(cherry picked from commit d99b8375dd7a1f9f69f8bcc5bde50ad2669b2b72)

Review-Url: https://codereview.chromium.org/2813903006 .
Cr-Commit-Position: refs/branch-heads/3029@{#695}
Cr-Branched-From:
939b32ee5ba05c396eef3fd992822fcca9a2e262-refs/heads/master@{#454471}
Committed:
https://chromium.googlesource.com/chromium/src/+/e64f95fdc842b8a37fa12ab375f8...
==========

[dtapuska, 2017-04-13 19:48:57]

Committed patchset #1 (id:1) manually as
e64f95fdc842b8a37fa12ab375f82805f87f32d0.