[blink] Request compositing update when canvas hibernates/wakes up.

[blink] Request compositing update when canvas hibernates/wakes up.

Not requesting the update can lead to the canvas not
being shown, as in the bug referenced below.

BUG=708445
Review-Url: https://codereview.chromium.org/2808493002
Cr-Commit-Position: refs/heads/master@{#465206}
(cherry picked from commit 5047940999a9cf13e8635e61112fdaa7db885726)

Review-Url: https://codereview.chromium.org/2828693002 .
Cr-Commit-Position: refs/branch-heads/3071@{#47}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/0009f9a6c1416b2a23a33f69a86f5d21dccbf620

[Eric Seckler, 2017-04-19 12:41:48]

Description was changed from

==========
[blink] Request compositing update when canvas hibernates/wakes up.

Not requesting the update can lead to the canvas not
being shown, as in the bug referenced below.

BUG=708445

Review-Url: https://codereview.chromium.org/2808493002
Cr-Commit-Position: refs/heads/master@{#465206}
(cherry picked from commit 5047940999a9cf13e8635e61112fdaa7db885726)
==========

to

==========
[blink] Request compositing update when canvas hibernates/wakes up.

Not requesting the update can lead to the canvas not
being shown, as in the bug referenced below.

BUG=708445

Review-Url: https://codereview.chromium.org/2808493002
Cr-Commit-Position: refs/heads/master@{#465206}
(cherry picked from commit 5047940999a9cf13e8635e61112fdaa7db885726)

Review-Url: https://codereview.chromium.org/2828693002 .
Cr-Commit-Position: refs/branch-heads/3071@{#47}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/0009f9a6c1416b2a23a33f69a86f...
==========

[Eric Seckler, 2017-04-19 12:41:50]

Committed patchset #1 (id:1) manually as
0009f9a6c1416b2a23a33f69a86f5d21dccbf620.