Move page scale animation from LayerTreeHostImpl to LayerTreeImpl

Move page scale animation from LayerTreeHostImpl to LayerTreeImpl

When a text field is focused on Android, the keyboard comes up and the field
is zoomed into the viewport. The page scale animation that is created would
happen in LayerTreeHostImpl, however, the resized viewport layers were still
in the sync_tree until it got activated. This led to incorrect clamping of
the viewport when the text field was near the bottom of the document and
becomes more visible when virtual viewport pinch to zoom is turned on.

BUG=364217, 419450
Committed: https://crrev.com/915bf3594a53100adf71c2546aee0eaf63958291
Cr-Commit-Position: refs/heads/master@{#297913}

[bokan, 2014-10-01 21:02:49]

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

[bokan, 2014-10-01 21:02:49]

PTAL

[bokan, 2014-10-01 21:10:19]

On 2014/10/01 21:02:49, bokan wrote:
> PTAL

Also note this fixes the issue in the non-virtual viewport case.

[aelias_OOO_until_Jul13, 2014-10-02 00:41:59]

lgtm

[bokan, 2014-10-02 12:28:30]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2014-10-02 12:29:39]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615953005/20001

[commit-bot: I haz the power, 2014-10-02 12:33:10]

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

[commit-bot: I haz the power, 2014-10-02 12:33:11]

Try jobs failed on following builders:
  ios_rel_device on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device/bu...)
  ios_rel_device_ninja on tryserver.chromium.mac
(http://build.chromium.org/p/tryserver.chromium.mac/builders/ios_rel_device_ni...)
  win8_chromium_rel on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win8_chromium_rel...)
  win_chromium_x64_rel_swarming on tryserver.chromium.win
(http://build.chromium.org/p/tryserver.chromium.win/builders/win_chromium_x64_...)

[bokan, 2014-10-02 13:50:59]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2014-10-02 13:51:44]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615953005/40001

[commit-bot: I haz the power, 2014-10-02 13:58:54]

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

[commit-bot: I haz the power, 2014-10-02 13:58:56]

Try jobs failed on following builders:
  android_chromium_gn_compile_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_chromiu...)
  linux_chromium_gn_rel on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/linux_chromium_...)

[bokan, 2014-10-02 14:09:44]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2014-10-02 14:10:51]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615953005/60001

[commit-bot: I haz the power, 2014-10-02 14:27:19]

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

[commit-bot: I haz the power, 2014-10-02 14:27:21]

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

[bokan, 2014-10-02 18:41:48]

The CQ bit was checked by bokan@chromium.org

[commit-bot: I haz the power, 2014-10-02 18:42:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615953005/80001

[commit-bot: I haz the power, 2014-10-02 21:57:26]

Committed patchset #5 (id:80001) as 675eefcb8ced04a1ad2349296058268abd29535f

[commit-bot: I haz the power, 2014-10-02 21:58:16]

Patchset 5 (id:??) landed as
https://crrev.com/915bf3594a53100adf71c2546aee0eaf63958291
Cr-Commit-Position: refs/heads/master@{#297913}