cc: Clear the invalidation history when moving between compositors.

cc: Clear the invalidation history when moving between compositors.

When a layer is moved to a new compositor, the source frame number can
change non-monotonically. When this happens to PicturePile's
invalidation history it DCHECKs due to this. To support PicturePile's
use of the source frame number, when the source frame number's base
changes we inform the PicturePile and have it reset its invalidation
history.

R=enne
BUG=369653
Committed: https://crrev.com/5537a42c2b6bf70a9c1fa6fed5092747235f1aa4
Cr-Commit-Position: refs/heads/master@{#318326}

[enne (OOO), 2015-02-26 20:46:04]

https://codereview.chromium.org/959003002/diff/1/cc/layers/picture_layer_unit...
File cc/layers/picture_layer_unittest.cc (right):

https://codereview.chromium.org/959003002/diff/1/cc/layers/picture_layer_unit...
cc/layers/picture_layer_unittest.cc:115: TEST(PictureLayerTest,
NonMonotonicSourceFrameNumber) {
How would this fail before the change?

[danakj, 2015-02-26 21:10:23]

https://codereview.chromium.org/959003002/diff/1/cc/layers/picture_layer_unit...
File cc/layers/picture_layer_unittest.cc (right):

https://codereview.chromium.org/959003002/diff/1/cc/layers/picture_layer_unit...
cc/layers/picture_layer_unittest.cc:115: TEST(PictureLayerTest,
NonMonotonicSourceFrameNumber) {
On 2015/02/26 20:46:04, enne wrote:
> How would this fail before the change?

It would DCHECK.

[enne (OOO), 2015-02-26 21:15:47]

lgtm with a test-level comment that describes what the test is doing.

[danakj, 2015-02-26 21:17:25]

https://codereview.chromium.org/959003002/diff/1/cc/layers/picture_layer_unit...
File cc/layers/picture_layer_unittest.cc (right):

https://codereview.chromium.org/959003002/diff/1/cc/layers/picture_layer_unit...
cc/layers/picture_layer_unittest.cc:115: TEST(PictureLayerTest,
NonMonotonicSourceFrameNumber) {
On 2015/02/26 21:10:23, danakj wrote:
> On 2015/02/26 20:46:04, enne wrote:
> > How would this fail before the change?
> 
> It would DCHECK.

Added comment.

[danakj, 2015-02-26 21:17:54]

The CQ bit was checked by danakj@chromium.org

[danakj, 2015-02-26 21:17:55]

The patchset sent to the CQ was uploaded after l-g-t-m from enne@chromium.org
Link to the patchset: https://codereview.chromium.org/959003002/#ps20001 (title:
"picturemovemonitor: .")

[commit-bot: I haz the power, 2015-02-26 21:18:30]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/959003002/20001

[commit-bot: I haz the power, 2015-02-26 22:09:49]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2015-02-26 22:11:04]

Patchset 2 (id:??) landed as
https://crrev.com/5537a42c2b6bf70a9c1fa6fed5092747235f1aa4
Cr-Commit-Position: refs/heads/master@{#318326}