cc: Rename picture layer tiling method to reflect its new functionality.

cc: Rename picture layer tiling method to reflect its new functionality.

After latest changes, PictureLayerTiling::UpdateTileAndTwinPriority does
not update twin priority. It should thus be called UpdateTilePriority.

Committed: https://crrev.com/1e28a7e08bf7d714db4c7687a56f8327c7152819
Cr-Commit-Position: refs/heads/master@{#328301}

[USE eero AT chromium.org, 2015-04-27 14:21:38]

e.hakkinen@samsung.com changed reviewers:
+ danakj@chromium.org, vmpstr@chromium.org

[USE eero AT chromium.org, 2015-04-27 14:21:39]

PTAL.

[vmpstr, 2015-05-04 17:34:53]

lgtm

[USE eero AT chromium.org, 2015-05-05 07:53:39]

The CQ bit was checked by e.hakkinen@samsung.com

[commit-bot: I haz the power, 2015-05-05 07:54:06]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1107033002/20001

[commit-bot: I haz the power, 2015-05-05 09:08:22]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-05-05 09:09:24]

Patchset 2 (id:??) landed as
https://crrev.com/1e28a7e08bf7d714db4c7687a56f8327c7152819
Cr-Commit-Position: refs/heads/master@{#328301}