Add some plumbing for the color management of canvases

third_party/WebKit/public/platform/WebExternalBitmap.h

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 15 matching lines @@
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #ifndef WebExternalBitmap_h
 #define WebExternalBitmap_h
 
 #include "WebSize.h"
 
+class SkColorSpace;
+
 namespace blink {
 
 class WebExternalBitmap {
 public:
     virtual WebSize size() = 0;
 
     // Sets the size of the bitmap. This may reallocate the bitmap and
     // invalidate the pointer returned from pixels if the size changes.
     virtual void setSize(WebSize) = 0;
 
     // Returns the pixels for the bitmap. The buffer that's returned will
     // contain size().width * size().height * 4 bytes and will use Skia's byte
     // order.
     virtual uint8_t* pixels() = 0;
 };
 
 } // namespace blink
 
 #endif // WebExternalBitmap_h