Add methods to GPU extensions to precisely determine visual viewport dimensions.

Add methods to GPU extensions to precisely determine visual viewport properties.

Gesture code in telemetry relies on the ability to calculate the bounding rect
of an element within the visual viewport. It's currently incorrect because it
doesn't have enough information to be able to calculate that. Namely, it needs
to know the visual viewport's offset within the layout viewport. I've also
added an explicit method for getting the page scale factor. Telemetry code
currently uses window.outerWidth / window.innerWidth which *mostly* works but
is a roundabout hack and has some edge cases.

BUG=564008
Committed: https://crrev.com/7ef0e8bf2f09d4b2cbae994a944c99ac0eba56a7
Cr-Commit-Position: refs/heads/master@{#385894}

[bokan, 2016-04-07 03:49:36]

Description was changed from

==========
Add methods to GPU extensions to precisely determine visual viewport dimensions.

BUG=
==========

to

==========
Add methods to GPU extensions to precisely determine visual viewport dimensions.

BUG=564008
==========

[bokan, 2016-04-07 16:23:42]

Description was changed from

==========
Add methods to GPU extensions to precisely determine visual viewport dimensions.

BUG=564008
==========

to

==========
Add methods to GPU extensions to precisely determine visual viewport properties.

Gesture code in telemetry relies on the ability to calculate the bounding rect
of an element within the visual viewport. It's currently incorrect because it
doesn't have enough information to be able to calculate that. Namely, it needs
to know the visual viewport's offset within the layout viewport. I've also
added an explicit method for getting the page scale factor. Telemetry code
currently uses window.outerWidth / window.innerWidth which *mostly* works but
is a roundabout hack and has some edge cases.

BUG=564008
==========

[bokan, 2016-04-07 16:24:37]

bokan@chromium.org changed reviewers:
+ avi@chromium.org

[bokan, 2016-04-07 16:24:37]

Hi Avi, ptal.

[Avi (use Gerrit), 2016-04-07 18:03:11]

lgtm

[bokan, 2016-04-07 18:03:36]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2016-04-07 18:04:02]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1866793003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1866793003/1

[commit-bot: I haz the power, 2016-04-07 19:15:58]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2016-04-07 19:15:59]

Try jobs failed on following builders:
  linux_chromium_chromeos_rel_ng on tryserver.chromium.linux (JOB_FAILED,
http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[bokan, 2016-04-07 20:46:41]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2016-04-07 20:47:19]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1866793003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1866793003/1

[commit-bot: I haz the power, 2016-04-07 22:07:44]

Description was changed from

==========
Add methods to GPU extensions to precisely determine visual viewport properties.

Gesture code in telemetry relies on the ability to calculate the bounding rect
of an element within the visual viewport. It's currently incorrect because it
doesn't have enough information to be able to calculate that. Namely, it needs
to know the visual viewport's offset within the layout viewport. I've also
added an explicit method for getting the page scale factor. Telemetry code
currently uses window.outerWidth / window.innerWidth which *mostly* works but
is a roundabout hack and has some edge cases.

BUG=564008
==========

to

==========
Add methods to GPU extensions to precisely determine visual viewport properties.

Gesture code in telemetry relies on the ability to calculate the bounding rect
of an element within the visual viewport. It's currently incorrect because it
doesn't have enough information to be able to calculate that. Namely, it needs
to know the visual viewport's offset within the layout viewport. I've also
added an explicit method for getting the page scale factor. Telemetry code
currently uses window.outerWidth / window.innerWidth which *mostly* works but
is a roundabout hack and has some edge cases.

BUG=564008
==========

[commit-bot: I haz the power, 2016-04-07 22:07:45]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2016-04-07 22:09:26]

Description was changed from

==========
Add methods to GPU extensions to precisely determine visual viewport properties.

Gesture code in telemetry relies on the ability to calculate the bounding rect
of an element within the visual viewport. It's currently incorrect because it
doesn't have enough information to be able to calculate that. Namely, it needs
to know the visual viewport's offset within the layout viewport. I've also
added an explicit method for getting the page scale factor. Telemetry code
currently uses window.outerWidth / window.innerWidth which *mostly* works but
is a roundabout hack and has some edge cases.

BUG=564008
==========

to

==========
Add methods to GPU extensions to precisely determine visual viewport properties.

Gesture code in telemetry relies on the ability to calculate the bounding rect
of an element within the visual viewport. It's currently incorrect because it
doesn't have enough information to be able to calculate that. Namely, it needs
to know the visual viewport's offset within the layout viewport. I've also
added an explicit method for getting the page scale factor. Telemetry code
currently uses window.outerWidth / window.innerWidth which *mostly* works but
is a roundabout hack and has some edge cases.

BUG=564008

Committed: https://crrev.com/7ef0e8bf2f09d4b2cbae994a944c99ac0eba56a7
Cr-Commit-Position: refs/heads/master@{#385894}
==========

[commit-bot: I haz the power, 2016-04-07 22:09:27]

Patchset 1 (id:??) landed as
https://crrev.com/7ef0e8bf2f09d4b2cbae994a944c99ac0eba56a7
Cr-Commit-Position: refs/heads/master@{#385894}