https://bugs.webkit.org/show_bug.cgi?id=83611

Reviewed by Alejandro G. Castro.

Source/WebCore:

No new tests. This is just a refactoring. This shouldn't change
functionality.

Added class that wraps Cairo images surfaces to serve as the "native image"
type for the Cairo platform. This will allow the addition of caching resampled
images as well as versions of the image for non-image Cairo backends. Also
split out BitmapImageCairo.cpp from ImageCairo.cpp since these classes are
defined in two headers.

* GNUmakefile.list.am: Added new files.
* platform/graphics/BitmapImage.h: Added a factory method that takes an image surface to
reduce code churn.
* platform/graphics/ImageSource.h: NativeImagePtr is now NativeImageCairo*.
(WebCore):
* platform/graphics/cairo/BitmapImageCairo.cpp: Copied from Source/WebCore/platform/graphics/cairo/ImageCairo.cpp.
* platform/graphics/cairo/GraphicsContext3DCairo.cpp: Updated to reflect use of NativeImageCairo.
* platform/graphics/cairo/ImageCairo.cpp: Ditto.
* platform/graphics/cairo/NativeImageCairo.cpp: Added.
* platform/graphics/cairo/NativeImageCairo.h: Added.
* platform/graphics/cairo/PatternCairo.cpp: Updated to reflect use of NativeImageCairo.
* platform/graphics/gtk/ImageGtk.cpp: Ditto.
* platform/image-decoders/cairo/ImageDecoderCairo.cpp: Ditto.

Source/WebKit/efl:

* ewk/ewk_history.cpp: Updated to reflect addition of NativeImageCario.
* ewk/ewk_settings.cpp: Ditto.

Source/WebKit2:

* Shared/gtk/ArgumentCodersGtk.cpp: Updated to reflect the addition of NativeImageCairo.

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@115385 268f45cc-cd09-0410-ab3c-d52691b4dbfc