This CL implements the first draft of Canvas 2D Context Attributes, aka getContext('2d', { alpha: f…

Source/core/platform/graphics/chromium/Canvas2DLayerBridge.h

Index: Source/core/platform/graphics/chromium/Canvas2DLayerBridge.h
diff --git a/Source/core/platform/graphics/chromium/Canvas2DLayerBridge.h b/Source/core/platform/graphics/chromium/Canvas2DLayerBridge.h
index 7cfc309498cab9e5312d4ae59c0a2b742f40187c..ad139ae51f2f6e27ed4a406f5efb05de40042e20 100644
--- a/Source/core/platform/graphics/chromium/Canvas2DLayerBridge.h
+++ b/Source/core/platform/graphics/chromium/Canvas2DLayerBridge.h
@@ -44,14 +44,19 @@ namespace WebCore {
 class Canvas2DLayerBridge : public WebKit::WebExternalTextureLayerClient, public SkDeferredCanvas::NotificationClient, public DoublyLinkedListNode<Canvas2DLayerBridge> {
     WTF_MAKE_NONCOPYABLE(Canvas2DLayerBridge);
 public:
+    enum OpacityMode {
+        Opaque,
+        NonOpaque
+    };
+
     enum ThreadMode {
         SingleThread,
         Threaded
     };
 
-    static PassOwnPtr<Canvas2DLayerBridge> create(PassRefPtr<GraphicsContext3D> context, const IntSize& size, ThreadMode threading, unsigned textureId)
+    static PassOwnPtr<Canvas2DLayerBridge> create(PassRefPtr<GraphicsContext3D> context, const IntSize& size, OpacityMode opacityMode, ThreadMode threading, unsigned textureId)
     {
-        return adoptPtr(new Canvas2DLayerBridge(context, size, threading, textureId));
+        return adoptPtr(new Canvas2DLayerBridge(context, size, opacityMode, threading, textureId));
     }
 
     virtual ~Canvas2DLayerBridge();
@@ -82,7 +87,7 @@ public:
     unsigned backBufferTexture();
 
 protected:
-    Canvas2DLayerBridge(PassRefPtr<GraphicsContext3D>, const IntSize&, ThreadMode, unsigned textureId);
+    Canvas2DLayerBridge(PassRefPtr<GraphicsContext3D>, const IntSize&, OpacityMode, ThreadMode, unsigned textureId);
 
     unsigned m_backBufferTexture;
     IntSize m_size;