Allow DrawingBuffer to present to a bitmap.

public/platform/WebExternalBitmap.h

Index: public/platform/WebExternalBitmap.h
diff --git a/public/platform/WebGraphicsContext3DProvider.h b/public/platform/WebExternalBitmap.h
similarity index 80%
copy from public/platform/WebGraphicsContext3DProvider.h
copy to public/platform/WebExternalBitmap.h
index dba2216773526377c53b27a9d6830bce0c25fc48..cba09240f8f75c91b9be5362dcee8cff505170b8 100644
--- a/public/platform/WebGraphicsContext3DProvider.h
+++ b/public/platform/WebExternalBitmap.h
@@ -28,24 +28,24 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebGraphicsContext3DProvider_h
-#define WebGraphicsContext3DProvider_h
+#ifndef WebExternalBitmap_h
+#define WebExternalBitmap_h
 
-#include "WebCommon.h"
-
-class GrContext;
+#include "WebSize.h"

[jochen (gone - plz use gerrit), 2013/07/02 22:37:01]

I think it should be enough to forward declare WebSize?

 
 namespace WebKit {
-class WebGraphicsContext3D;
 
-class WebGraphicsContext3DProvider {
+class WebExternalBitmap {
 public:
-    virtual ~WebGraphicsContext3DProvider() { }
+    virtual WebSize getSize() = 0;
+
+    // Sets the size of the bitmap. This will reallocate the bitmap and
+    // invalidate the pointer returned from getPointer if the size changes.

[jochen (gone - plz use gerrit), 2013/07/02 22:37:01]

how will you guarantee this (given that this is a pure virtual interface?)

This API looks very opaque to me, I'm not sure whether that's the best solution

+    virtual void setSize(WebSize) = 0;
 
-    virtual WebGraphicsContext3D* context3d() = 0;
-    virtual GrContext* grContext() = 0;
+    virtual void* getPointer() = 0;
 };
 
 } // namespace WebKit
 
-#endif
+#endif // WebExternalBitmap_h