Gallery.app: Fix image rotation in the image editor.

Gallery.app: Fix image rotation in the image editor.

There patch fixes the following two bugs.

1. The main cause: we assign null to metadata if we failed to fetch the data.
   But old code check the existance of data by using the 'in' operator and null
   value passes the check unexpectedlly.

2. Specifying OVER_FILL instead of FILL for an image in a tile of the mosaic
   view in case that the thumbnail image is samller than the tile.

BUG=375676
TEST=manually

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=273139

[hirono, 2014-05-26 09:02:17]

PTAL the CL? Thank you!

[mtomasz, 2014-05-27 06:12:24]

LGTM. Sorry for the belated response!

[hirono, 2014-05-27 06:13:25]

The CQ bit was checked by hirono@chromium.org

[commit-bot: I haz the power, 2014-05-27 06:13:37]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hirono@chromium.org/297323003/1

[hirono, 2014-05-27 06:13:45]

On 2014/05/27 06:12:24, mtomasz wrote:
> LGTM. Sorry for the belated response!

No problem, thank you!

[commit-bot: I haz the power, 2014-05-27 08:11:43]

FYI, CQ is re-trying this CL (attempt #1).
Please consider checking whether the failures are real,
and report flakes to chrome-troopers@google.com.
The failing builders are:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[commit-bot: I haz the power, 2014-05-27 09:33:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-05-27 09:33:06]

Try jobs failed on following builders:
  android_dbg_triggered_tests on tryserver.chromium
(http://build.chromium.org/p/tryserver.chromium/builders/android_dbg_triggered...)

[hirono, 2014-05-28 02:04:02]

The CQ bit was checked by hirono@chromium.org

[commit-bot: I haz the power, 2014-05-28 02:04:46]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/hirono@chromium.org/297323003/1

[commit-bot: I haz the power, 2014-05-28 03:17:48]

Change committed as 273139