Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we can avoid large changes of any existing C++ code. Layout tests has
been created to reflect this additional option.

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713
Committed: https://crrev.com/ecf58aa7eb349ab2b4beaec613183810c4edf135
Cr-Commit-Position: refs/heads/master@{#379302}

[xidachen, 2016-03-03 15:08:51]

The CQ bit was checked by xidachen@chromium.org to run a CQ dry run

[commit-bot: I haz the power, 2016-03-03 15:09:22]

Dry run: CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1756963003/1
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1756963003/1

[xidachen, 2016-03-03 15:19:15]

Description was changed from

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we don't need to change any existing C++ code. Layout tests has
been created to reflect this additional option.

BUG=591713
==========

to

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we don't need to change any existing C++ code. Layout tests has
been created to reflect this additional option. This option will also
be added to all the existing WebGL conformance tests.

BUG=591713
==========

[xidachen, 2016-03-03 16:15:48]

Description was changed from

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we don't need to change any existing C++ code. Layout tests has
been created to reflect this additional option. This option will also
be added to all the existing WebGL conformance tests.

BUG=591713
==========

to

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we don't need to change any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.

BUG=591713
==========

[xidachen, 2016-03-03 16:33:05]

The CQ bit was unchecked by xidachen@chromium.org

[xidachen, 2016-03-03 17:45:02]

Description was changed from

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we don't need to change any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.

BUG=591713
==========

to

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we don't need to change any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713
==========

[xidachen, 2016-03-03 18:01:18]

xidachen@chromium.org changed reviewers:
+ junov@chromium.org

[xidachen, 2016-03-03 18:01:18]

PTAL.

[xidachen, 2016-03-03 20:57:45]

Description was changed from

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we don't need to change any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713
==========

to

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we can avoid large changes of any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713
==========

[xidachen, 2016-03-04 15:39:43]

On 2016/03/03 18:01:18, xidachen wrote:
> PTAL.

gentle ping, this CL adds the "premultiply", so we can change "default" to
"premultiply" in all the WebGL conformance tests.

[Justin Novosad, 2016-03-04 15:47:36]

lgtm

[xidachen, 2016-03-04 15:49:23]

The CQ bit was checked by xidachen@chromium.org

[commit-bot: I haz the power, 2016-03-04 15:49:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1756963003/20001
View timeline at
 https://chromium-cq-status.appspot.com/patch-timeline/1756963003/20001

[commit-bot: I haz the power, 2016-03-04 16:56:41]

Description was changed from

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we can avoid large changes of any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713
==========

to

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we can avoid large changes of any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713
==========

[commit-bot: I haz the power, 2016-03-04 16:56:42]

Committed patchset #2 (id:20001)

[commit-bot: I haz the power, 2016-03-04 16:57:55]

Description was changed from

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we can avoid large changes of any existing C++ code. Layout tests has
been created to reflect this additional option. 

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713
==========

to

==========
Add "premultiply" in ImageBitmapOptions enum PremultiplyAlpha

At this moment, there are two options of "none" and "default", this CL
adds "premultiply". The code path for "premultiply" and "default" is the
same so we can avoid large changes of any existing C++ code. Layout tests has
been created to reflect this additional option.

Locally I have added this option to all the conformance tests for
ImageBitmap hosted by KhronosGroup/WebGL, and they all pass.
Once this CL landed, there will be a pull request to update those tests.

BUG=591713

Committed: https://crrev.com/ecf58aa7eb349ab2b4beaec613183810c4edf135
Cr-Commit-Position: refs/heads/master@{#379302}
==========

[commit-bot: I haz the power, 2016-03-04 16:57:56]

Patchset 2 (id:??) landed as
https://crrev.com/ecf58aa7eb349ab2b4beaec613183810c4edf135
Cr-Commit-Position: refs/heads/master@{#379302}