Use WebBlendMode in FEBlend

Use WebBlendMode in FEBlend

This replaces the BlendModeType enumeration with the WebBlendMode for
FEBlend::m_mode. The former is moved to SVGFEBlendElement.
This enables FEBlend to use all of the blend modes available in
WebBlendMode, and leave any subset selection to the client of FEBlend
(which is SVGFEBlendElement).
The BlendModeType->string mapping is replaced by compositeOperatorName().

BUG=389594
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=179029

[Stephen White, 2014-07-25 17:00:43]

LGTM

[Rik, 2014-07-25 17:40:44]

On 2014/07/25 16:50:25, fs wrote:

Do you have plans to implement the full set of blend modes?
They were already added to WK and we're planning on adding them to firefox as
well

[fs, 2014-07-28 08:11:07]

On 2014/07/25 17:40:44, Rik wrote:
> On 2014/07/25 16:50:25, fs wrote:
> 
> Do you have plans to implement the full set of blend modes?
> They were already added to WK and we're planning on adding them to firefox as
> well

See referenced bug =).

[fs, 2014-07-28 08:11:34]

The CQ bit was checked by fs@opera.com

[commit-bot: I haz the power, 2014-07-28 08:12:38]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/fs@opera.com/419253002/20001

[commit-bot: I haz the power, 2014-07-28 08:49:03]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/19180)

[commit-bot: I haz the power, 2014-07-28 09:52:31]

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

[commit-bot: I haz the power, 2014-07-28 09:52:32]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/19189)

[fs, 2014-07-28 12:10:05]

The CQ bit was checked by fs@opera.com

[commit-bot: I haz the power, 2014-07-28 12:10:42]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/fs@opera.com/419253002/40001

[commit-bot: I haz the power, 2014-07-28 12:14:00]

Change committed as 179029