Merge "Fix form validation bubble positioning at hidpi." to M56

Merge "Fix form validation bubble positioning at hidpi." to M56

Since use-zoom-for-dsf launched, when Blink converts to screen
coordinates it needs to take the device scale factor into account.
Normally it would do this by calling viewportToScreen or a similar
function. However, because the validation bubble anchor is in viewport
coordinates instead of screen coordinates, the positioning code needs to
use device scale factor explicitly.

The reason we can't just convert the anchor to screen coordinates in
Blink is because the same anchor is used for cocoa. It needs to y-flip
the anchor for OSX and converting to screen coordinates too early messes
up that calculation.

BUG=660840
Review-Url: https://codereview.chromium.org/2491113002
Cr-Commit-Position: refs/heads/master@{#433349}
(cherry picked from commit 5debc705a0b892bd2dcf82ec7672147268083957)

Committed: https://chromium.googlesource.com/chromium/src/+/1f010f3da574e93bfafb68a0149ae8d350202e71

[tkent, 2016-12-20 01:56:46]

Description was changed from

==========
Merge "Fix form validation bubble positioning at hidpi." to M56

Since use-zoom-for-dsf launched, when Blink converts to screen
coordinates it needs to take the device scale factor into account.
Normally it would do this by calling viewportToScreen or a similar
function. However, because the validation bubble anchor is in viewport
coordinates instead of screen coordinates, the positioning code needs to
use device scale factor explicitly.

The reason we can't just convert the anchor to screen coordinates in
Blink is because the same anchor is used for cocoa. It needs to y-flip
the anchor for OSX and converting to screen coordinates too early messes
up that calculation.

BUG=660840

Review-Url: https://codereview.chromium.org/2491113002
Cr-Commit-Position: refs/heads/master@{#433349}
(cherry picked from commit 5debc705a0b892bd2dcf82ec7672147268083957)
==========

to

==========
Merge "Fix form validation bubble positioning at hidpi." to M56

Since use-zoom-for-dsf launched, when Blink converts to screen
coordinates it needs to take the device scale factor into account.
Normally it would do this by calling viewportToScreen or a similar
function. However, because the validation bubble anchor is in viewport
coordinates instead of screen coordinates, the positioning code needs to
use device scale factor explicitly.

The reason we can't just convert the anchor to screen coordinates in
Blink is because the same anchor is used for cocoa. It needs to y-flip
the anchor for OSX and converting to screen coordinates too early messes
up that calculation.

BUG=660840

Review-Url: https://codereview.chromium.org/2491113002
Cr-Commit-Position: refs/heads/master@{#433349}
(cherry picked from commit 5debc705a0b892bd2dcf82ec7672147268083957)

Committed:
https://chromium.googlesource.com/chromium/src/+/1f010f3da574e93bfafb68a0149a...
==========

[tkent, 2016-12-20 01:56:48]

Committed patchset #1 (id:1) manually as
1f010f3da574e93bfafb68a0149ae8d350202e71.