mix-blend-mode implementation for accelerated layers - blink part

public/platform/WebBlendMode.h

Index: public/platform/WebBlendMode.h
diff --git a/public/platform/WebGraphicsContext3DProvider.h b/public/platform/WebBlendMode.h
similarity index 77%
copy from public/platform/WebGraphicsContext3DProvider.h
copy to public/platform/WebBlendMode.h
index 7f70cfd71182b0facf246fbfb0c69ef9ca8f7a2f..16d7c1928011d6f270ad23e2c2587c3ff428973d 100644
--- a/public/platform/WebGraphicsContext3DProvider.h
+++ b/public/platform/WebBlendMode.h
@@ -28,22 +28,30 @@
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
-#ifndef WebGraphicsContext3DProvider_h
-#define WebGraphicsContext3DProvider_h
+#ifndef WebBlendMode_h
+#define WebBlendMode_h
 
 #include "WebCommon.h"
 
-class GrContext;
-
 namespace blink {
-class WebGraphicsContext3D;
-
-class WebGraphicsContext3DProvider {
-public:
-    virtual ~WebGraphicsContext3DProvider() { }
 
-    virtual WebGraphicsContext3D* context3d() = 0;
-    virtual GrContext* grContext() = 0;
+enum WebBlendMode {
+    WebBlendModeNormal,
+    WebBlendModeMultiply,
+    WebBlendModeScreen,
+    WebBlendModeOverlay,
+    WebBlendModeDarken,
+    WebBlendModeLighten,
+    WebBlendModeColorDodge,
+    WebBlendModeColorBurn,
+    WebBlendModeHardLight,
+    WebBlendModeSoftLight,
+    WebBlendModeDifference,
+    WebBlendModeExclusion,
+    WebBlendModeHue,
+    WebBlendModeSaturation,
+    WebBlendModeColor,
+    WebBlendModeLuminosity
 };
 
 } // namespace blink