[blink] Fix crashes in CanvasRenderingContext2DTests.

[blink] Fix crashes in CanvasRenderingContext2DTests.

ElementRequestsCompositingUpdateOnHibernateAndWakeUp caused crashes
after finishing. It seems this is caused by resetting the testing
platform after TearDown() runs. This patch makes sure that it is reset
before.

BUG=713352
Review-Url: https://codereview.chromium.org/2826403002
Cr-Commit-Position: refs/heads/master@{#466604}
(cherry picked from commit d5521d9d44f51d4372ac4246747761c437739e9d)

Review-Url: https://codereview.chromium.org/2836283002 .
Cr-Commit-Position: refs/branch-heads/3071@{#199}
Cr-Branched-From: a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed: https://chromium.googlesource.com/chromium/src/+/f67183d3d0bc00c432556d98ae989759dca2d7dc

[Eric Seckler, 2017-04-25 10:59:05]

Description was changed from

==========
[blink] Fix crashes in CanvasRenderingContext2DTests.

ElementRequestsCompositingUpdateOnHibernateAndWakeUp caused crashes
after finishing. It seems this is caused by resetting the testing
platform after TearDown() runs. This patch makes sure that it is reset
before.

BUG=713352

Review-Url: https://codereview.chromium.org/2826403002
Cr-Commit-Position: refs/heads/master@{#466604}
(cherry picked from commit d5521d9d44f51d4372ac4246747761c437739e9d)
==========

to

==========
[blink] Fix crashes in CanvasRenderingContext2DTests.

ElementRequestsCompositingUpdateOnHibernateAndWakeUp caused crashes
after finishing. It seems this is caused by resetting the testing
platform after TearDown() runs. This patch makes sure that it is reset
before.

BUG=713352

Review-Url: https://codereview.chromium.org/2826403002
Cr-Commit-Position: refs/heads/master@{#466604}
(cherry picked from commit d5521d9d44f51d4372ac4246747761c437739e9d)

Review-Url: https://codereview.chromium.org/2836283002 .
Cr-Commit-Position: refs/branch-heads/3071@{#199}
Cr-Branched-From:
a106f0abbf69dad349d4aaf4bcc4f5d376dd2377-refs/heads/master@{#464641}
Committed:
https://chromium.googlesource.com/chromium/src/+/f67183d3d0bc00c432556d98ae98...
==========

[Eric Seckler, 2017-04-25 10:59:06]

Committed patchset #1 (id:1) manually as
f67183d3d0bc00c432556d98ae989759dca2d7dc.