Fix DecompressionTask with power-of-two expanded thumbnails.

Fix DecompressionTask with power-of-two expanded thumbnails.

Older versions of Chrome expanded thumbnails to 1024x1024 to work around
an IMG driver bug.  When these were processed through DecompressionTask,
they got corrupted because this method assumed the content size and
buffer size were the same.  This patch changes it to decompress into a
potentially larger buffer then copy if needed.

BUG=416437
Committed: https://crrev.com/93778c0cb6edfe0d5b1146e2797fbac9abadaf14
Cr-Commit-Position: refs/heads/master@{#296341}

[aelias_OOO_until_Jul13, 2014-09-23 23:27:28]

aelias@chromium.org changed reviewers:
+ clholgat@chromium.org, tedchoc@chromium.org, yusufo@chromium.org

[aelias_OOO_until_Jul13, 2014-09-23 23:28:35]

PTAL.  tedchoc@ for OWNERS, yusufo@ and clholgat@ for initial review.

[Yusuf, 2014-09-23 23:52:49]

lgtm with a styling nit

https://codereview.chromium.org/598593003/diff/1/chrome/browser/android/thumb...
File chrome/browser/android/thumbnail/thumbnail_store.cc (right):

https://codereview.chromium.org/598593003/diff/1/chrome/browser/android/thumb...
chrome/browser/android/thumbnail/thumbnail_store.cc:877:
raw_data_small.allocPixels(SkImageInfo::Make(content_size.width(),
indent +4

[Ted C, 2014-09-24 02:40:43]

lgtm

[aelias_OOO_until_Jul13, 2014-09-24 02:56:02]

The CQ bit was checked by aelias@chromium.org

[commit-bot: I haz the power, 2014-09-24 02:56:46]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/598593003/80001

[commit-bot: I haz the power, 2014-09-24 03:47:27]

Committed patchset #5 (id:80001) as 82ec87938e3d539b2cad36503f75d907dcead280

[commit-bot: I haz the power, 2014-09-24 03:48:03]

Patchset 5 (id:??) landed as
https://crrev.com/93778c0cb6edfe0d5b1146e2797fbac9abadaf14
Cr-Commit-Position: refs/heads/master@{#296341}