cc: Make sure to issue IsReadyToDraw when we're out of memory.

cc: Make sure to issue IsReadyToDraw when we're out of memory.

This patch ensures that when we run out of memory, we still issue both
ready to activate and ready to draw signals. The activation signal was
already there, since we rely on it to activate. However, we also rely
on the draw signal in the browser to draw. This patch adds the missing
signal. Instead of freezing, we will now checkerboard/drop quads.

BUG=551983
R=reveman
CQ_INCLUDE_TRYBOTS=tryserver.blink:linux_blink_rel

Committed: https://crrev.com/7b89137245b37365c8b09c4cd417b0946c59ae1c
Cr-Commit-Position: refs/heads/master@{#358671}

[vmpstr, 2015-11-09 19:22:34]

Please take a look.

[reveman, 2015-11-09 20:34:04]

lgtm

[vmpstr, 2015-11-09 20:37:32]

The CQ bit was checked by vmpstr@chromium.org

[commit-bot: I haz the power, 2015-11-09 20:40:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1430313002/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1430313002/1

[commit-bot: I haz the power, 2015-11-09 21:56:00]

Committed patchset #1 (id:1)

[commit-bot: I haz the power, 2015-11-09 21:56:35]

Patchset 1 (id:??) landed as
https://crrev.com/7b89137245b37365c8b09c4cd417b0946c59ae1c
Cr-Commit-Position: refs/heads/master@{#358671}