GTK: Move CairoCachedSurface from being owned by GtkThemeService to gfx::Image.

ui/gfx/image/image.h

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // An Image wraps an image any flavor, be it platform-native GdkBitmap/NSImage,
 // or a SkBitmap. This also provides easy conversion to other image types
 // through operator overloading. It will cache the converted representations
 // internally to prevent double-conversion.
 //
 // The lifetime of both the initial representation and any converted ones are
@@ skipping 17 matching lines @@
 
 class SkBitmap;
 
 namespace {
 class ImageTest;
 class ImageMacTest;
 }
 
 namespace gfx {
 
+#if defined(TOOLKIT_USES_GTK)
+class CairoCachedSurface;
+#endif
+
 namespace internal {
 class ImageRep;
 class ImageStorage;
 }
 
 class UI_EXPORT Image {
  public:
   enum RepresentationType {
     kImageRepGdk,
     kImageRepCocoa,
+    kImageRepCairoCache,
     kImageRepSkia,
   };
 
   typedef std::map<RepresentationType, internal::ImageRep*> RepresentationMap;
 
   // Creates a new image with the default representation. The object will take
   // ownership of the image.
   explicit Image(const SkBitmap* bitmap);
 
   // To create an Image that supports multiple resolutions pass a vector
@@ skipping 19 matching lines @@
   // Deletes the image and, if the only owner of the storage, all of its cached
   // representations.
   ~Image();
 
   // Converts the Image to the desired representation and stores it internally.
   // The returned result is a weak pointer owned by and scoped to the life of
   // the Image.
   const SkBitmap* ToSkBitmap() const;
 #if defined(TOOLKIT_USES_GTK)
   GdkPixbuf* ToGdkPixbuf() const;
+  CairoCachedSurface* const ToCairo() const;
 #elif defined(OS_MACOSX)
   NSImage* ToNSImage() const;
 #endif
 
   // Performs a conversion, like above, but returns a copy of the result rather
   // than a weak pointer. The caller is responsible for deleting the result.
   // Note that the result is only a copy in terms of memory management; the
   // backing pixels are shared amongst all copies (a fact of each of the
   // converted representations, rather than a limitation imposed by Image) and
   // so the result should be considered immutable.
@@ skipping 49 matching lines @@
   // be cheaply copied.
   scoped_refptr<internal::ImageStorage> storage_;
 
   friend class ::ImageTest;
   friend class ::ImageMacTest;
 };
 
 }  // namespace gfx
 
 #endif  // UI_GFX_IMAGE_IMAGE_H_