cc: Don't rasterize large layers at maximum scale before scale animations

cc: Don't rasterize large layers at maximum scale before scale animations

Layers with a scale animation are currently rasterized at the animation's
maximum scale when the animation starts. However, for large layers, this
approach consumes an excessive amount of memory.

This CL restricts the 'rasterize at maximum scale' approach to layers
that grow no larger than the viewport at maximum scale.

BUG=395760
Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=285656

[ajuma, 2014-07-25 15:58:32]

This is one part of a two-part plan for fixing memory usage during scale
animations which produce large layers at maximum scale.

The second part of this plan is to re-enable re-rastering during scale
animations when using GPU rasterization, but only for layers that don't have
text.

[enne (OOO), 2014-07-25 18:47:29]

I'm sad about how many heuristics we have about rastering at the right scale,
but this makes a lot of sense.  lgtm

[ajuma, 2014-07-25 18:54:35]

The CQ bit was checked by ajuma@chromium.org

[commit-bot: I haz the power, 2014-07-25 18:55:33]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/ajuma@chromium.org/420523002/20001

[commit-bot: I haz the power, 2014-07-25 20:12:57]

Change committed as 285656