cc: Make GetViewportForTilePriorityInContentSpace() not need intersect.

cc: Make GetViewportForTilePriorityInContentSpace() not need intersect.

Currently we always intersect GetViewportForTilePriorityInContentSpace()
with the visible_content_rect(), so instead just intersect before
returning so we can always use that value more simply.

R=boliu

Committed: https://crrev.com/cc4e60d8239b6e8b2cddb44e929cd39ff8e63722
Cr-Commit-Position: refs/heads/master@{#294727}

[boliu, 2014-09-12 21:26:57]

lgtm

[danakj, 2014-09-12 21:38:25]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-09-12 21:38:48]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/571653003/1

[commit-bot: I haz the power, 2014-09-12 22:10:35]

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

[commit-bot: I haz the power, 2014-09-12 22:10:36]

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...)

[danakj, 2014-09-13 02:03:12]

The CQ bit was checked by danakj@chromium.org

[commit-bot: I haz the power, 2014-09-13 02:04:21]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patchset/571653003/1

[commit-bot: I haz the power, 2014-09-13 02:45:31]

Committed patchset #1 (id:1) as 25dc1e72fdfc6be19b5b5695bf9a86dee6c0231f

[commit-bot: I haz the power, 2014-09-13 02:47:06]

Patchset 1 (id:??) landed as
https://crrev.com/cc4e60d8239b6e8b2cddb44e929cd39ff8e63722
Cr-Commit-Position: refs/heads/master@{#294727}