[chromium] ContentLayer's texture updater deleted during paint when compositing turns...

[chromium] ContentLayer's texture updater deleted during paint when compositing turns off in the middle of paint
https://bugs.webkit.org/show_bug.cgi?id=68405

Patch by James Robinson <jamesr@chromium.org> on 2011-09-19
Reviewed by Kenneth Russell.

Make TiledLayerChromium's textureUpdater refcounted and hold an explicit reference during paint in case
compositing is turned off halfway through a paint.

* platform/graphics/chromium/ContentLayerChromium.h:
* platform/graphics/chromium/ImageLayerChromium.cpp:
(WebCore::ImageLayerTextureUpdater::create):
* platform/graphics/chromium/ImageLayerChromium.h:
* platform/graphics/chromium/LayerTextureUpdater.h:
* platform/graphics/chromium/LayerTextureUpdaterCanvas.cpp:
(WebCore::LayerTextureUpdaterBitmap::create):
(WebCore::LayerTextureUpdaterSkPicture::create):
* platform/graphics/chromium/LayerTextureUpdaterCanvas.h:
* platform/graphics/chromium/TiledLayerChromium.cpp:
(WebCore::TiledLayerChromium::prepareToUpdate):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@95506 268f45cc-cd09-0410-ab3c-d52691b4dbfc