Rebuild property_tree after LayerImpl::SetTransform() is called in tests

Rebuild property_tree after LayerImpl::SetTransform() is called in tests

This fixes test LayerTreeHostCommonTest.MaximumAnimationScaleFactor

If LayerImpl::SetTransform() is called, we need to rebuild/update the
property_tree.

In practice, LayerImpl::SetTransform() is only called through
LayerImpl::OnTransformAnimated(), where we already do property tree
update.

In test LayerImpl::SetTranform() can be triggered by itself, in
this case, lets just force a property rebuild.

CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/843080ca2357f8441b77e3dd8a5aa32184f7b47a
Cr-Commit-Position: refs/heads/master@{#334050}

[Yufeng Shen (Slow to review), 2015-06-11 18:51:29]

miletus@chromium.org changed reviewers:
+ enne@chromium.org

[enne (OOO), 2015-06-11 20:44:16]

lgtm if you fix all the "tranform" typos in the CL title and description

I think just updating the tests is the right answer here.  We could also fix
things like SetTransform to update property trees, but then that would happen
during activation and commit.  My hope for property trees is that we can just
copy the trees and not have to do an extra update.

[Yufeng Shen (Slow to review), 2015-06-11 21:21:07]

The CQ bit was checked by miletus@chromium.org

[commit-bot: I haz the power, 2015-06-11 21:22:29]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1179003002/1

[commit-bot: I haz the power, 2015-06-11 22:11:08]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-06-11 22:11:56]

Patchset 1 (id:??) landed as
https://crrev.com/843080ca2357f8441b77e3dd8a5aa32184f7b47a
Cr-Commit-Position: refs/heads/master@{#334050}