Canvas 2D: Remove CompositeOperator and WebBlendMode parameters in drawImageInternal().

Canvas 2D: Remove CompositeOperator and WebBlendMode parameters in drawImageInternal().

fillInternal() and strokeInternal() don't have those parameters.
CompositeOperator and WebBlendMode parameters exists due to
drawImageFromRect(), which is non-standard API and will maybe deprecated.
Give up the optimization for only drawImageFromRect(), because it's confused
why drawImageInternal() doesn't set current global composite before calling
drawVideo().

In addition, include some clean-up.
1. remove redundant "blink::".
2. merge fullCanvasCompositedFill() with fullCanvasCompositedStroke().

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=183704

[dshwang, 2014-10-14 15:32:32]

dongseong.hwang@intel.com changed reviewers:
+ junov@chromium.org

[dshwang, 2014-10-14 15:32:32]

Could you review this clean-up?

[Justin Novosad, 2014-10-14 15:44:42]

On 2014/10/14 15:32:32, dshwang wrote:
> Could you review this clean-up?

lgtm

[dshwang, 2014-10-14 16:34:57]

On 2014/10/14 15:44:42, junov wrote:
> On 2014/10/14 15:32:32, dshwang wrote:
> > Could you review this clean-up?
> 
> lgtm

Thank you for fast review!

[dshwang, 2014-10-14 16:35:00]

The CQ bit was checked by dongseong.hwang@intel.com

[commit-bot: I haz the power, 2014-10-14 16:36:12]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/645693004/20001

[commit-bot: I haz the power, 2014-10-14 19:26:20]

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

[commit-bot: I haz the power, 2014-10-14 19:26:28]

Try jobs failed on following builders:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/31757)

[dshwang, 2014-10-14 21:53:39]

The CQ bit was checked by dongseong.hwang@intel.com

[commit-bot: I haz the power, 2014-10-14 21:55:10]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/645693004/20001

[commit-bot: I haz the power, 2014-10-14 23:08:38]

Committed patchset #2 (id:20001) as 183704