cc: Don't activate pending tree until all tiles are ready

cc: Don't activate pending tree until all tiles are ready

Previously, we'd activate the pending tree if there were similar numbers of
checkerboards, but this could cause unfortunate flashing.  Now, only activate
the tree if all the tiles in the 'now' bin (high-res, visible) are ready.

NOTRY=true
R=nduca@chromium.org
BUG=155209
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=175295

[nduca, 2013-01-05 04:51:49]

lgtm, but

https://codereview.chromium.org/11734007/diff/1/cc/layer_tree_host_impl.cc
File cc/layer_tree_host_impl.cc (left):

https://codereview.chromium.org/11734007/diff/1/cc/layer_tree_host_impl.cc#ol...
cc/layer_tree_host_impl.cc:1011: int total_active =
m_tileManager->GetTilesInBinCount(NOW_BIN, ACTIVE_TREE);
The more I stare at this, the more I think we should give per-layer activation a
try...

[enne (OOO), 2013-01-05 06:21:50]

I hear you.  I'll land this for now and will think about per-layer activation.

[commit-bot: I haz the power, 2013-01-05 06:22:06]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/enne@chromium.org/11734007/1

[commit-bot: I haz the power, 2013-01-05 06:42:19]

Retried try job too often on ios_dbg_simulator for step(s) sync_unit_tests,
unit_tests

[commit-bot: I haz the power, 2013-01-05 06:46:34]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/enne@chromium.org/11734007/1

[commit-bot: I haz the power, 2013-01-05 07:03:07]

Retried try job too often on ios_dbg_simulator for step(s) sync_unit_tests,
unit_tests

[commit-bot: I haz the power, 2013-01-05 14:40:08]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/enne@chromium.org/11734007/1

[commit-bot: I haz the power, 2013-01-05 14:50:32]

Retried try job too often on ios_dbg_simulator for step(s) sync_unit_tests,
unit_tests

[commit-bot: I haz the power, 2013-01-05 20:38:09]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/enne@chromium.org/11734007/1

[commit-bot: I haz the power, 2013-01-05 20:48:43]

Retried try job too often on ios_dbg_simulator for step(s) sync_unit_tests,
unit_tests

[commit-bot: I haz the power, 2013-01-06 04:32:38]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/enne@chromium.org/11734007/1

[commit-bot: I haz the power, 2013-01-06 05:08:19]

Change committed as 175295