Refactor GraphicsLayer::setContentsToImage().

Refactor GraphicsLayer::setContentsToImage().

This has three parts:
1) setContentsToImage() uses setContentsTo() like setContentsToNinePatch(),
setContentsToCanvas(), and setContentsToMedia().
2) get rid of duplicated code to setContentsTo() in setContentsToImage().
3) remove unused ContentsLayerPurpose enum.

BUG=114658
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=162541

[jamesr, 2013-11-21 20:46:02]

lgtm

https://codereview.chromium.org/75113003/diff/1/Source/core/platform/graphics...
File Source/core/platform/graphics/GraphicsLayer.cpp (right):

https://codereview.chromium.org/75113003/diff/1/Source/core/platform/graphics...
Source/core/platform/graphics/GraphicsLayer.cpp:1008: void
GraphicsLayer::setContentsToCanvas(WebLayer* layer)
i assume you'll remove these functions in a follow-up?

[dshwang, 2013-11-22 11:41:06]

On 2013/11/21 20:46:02, jamesr wrote:
> lgtm

Thank you for review.

>
https://codereview.chromium.org/75113003/diff/1/Source/core/platform/graphics...
> File Source/core/platform/graphics/GraphicsLayer.cpp (right):
> 
>
https://codereview.chromium.org/75113003/diff/1/Source/core/platform/graphics...
> Source/core/platform/graphics/GraphicsLayer.cpp:1008: void
> GraphicsLayer::setContentsToCanvas(WebLayer* layer)
> i assume you'll remove these functions in a follow-up?

yes, I'll do. :-)

[commit-bot: I haz the power, 2013-11-22 11:41:17]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/dongseong.hwang@intel.com/75113003/1

[commit-bot: I haz the power, 2013-11-22 13:07:10]

Change committed as 162541