Change the BMP decoder to not reject paletted images which use color indexes

Change the BMP decoder to not reject paletted images which use color indexes
beyond the end of the color table.  Instead, draw these pixels as black.

This matches Firefox and IE.

BUG=176678
TEST=none
R=abarth@chromium.org, hclam@chromium.org

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=170193

[Peter Kasting, 2014-03-26 21:35:52]

https://codereview.chromium.org/213613002/diff/1/Source/platform/image-decode...
File Source/platform/image-decoders/bmp/BMPImageReader.h (left):

https://codereview.chromium.org/213613002/diff/1/Source/platform/image-decode...
Source/platform/image-decoders/bmp/BMPImageReader.h:335: size_t
m_tableSizeInBytes;
This is just cleanup unconnected to the bugfix: we don't need this to be a
member, it can be a function-local.

[Alpha Left Google, 2014-03-26 21:41:38]

lgtm

[Peter Kasting, 2014-03-26 21:46:35]

Apparently only the trunk/ OWNERS can approve changes in this dir... that seems
suboptimal.

+abarth for OWNERS.  Adam, test for this is at
https://chromereviews.googleplex.com/32007014/ .

[abarth-chromium, 2014-03-27 03:39:43]

rslgtm

[abarth-chromium, 2014-03-27 03:40:00]

The CQ bit was checked by abarth@chromium.org

[commit-bot: I haz the power, 2014-03-27 03:40:10]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/pkasting@chromium.org/213613002/1

[commit-bot: I haz the power, 2014-03-27 03:45:47]

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

[commit-bot: I haz the power, 2014-03-27 03:45:47]

Try jobs failed on following builders:
  tryserver.blink on mac_blink_compile_dbg

[Peter Kasting, 2014-03-27 18:38:01]

Committed patchset #1 manually as r170193 (presubmit successful).