cc: Remove all remaining use of WebCore Rect/Point/Size types from the compositor.

cc/proxy.h

Index: cc/proxy.h
diff --git a/cc/proxy.h b/cc/proxy.h
index 8b5287dc705a838cce1b97667d2427872d528981..ac6154013ada114d66a7bc0906d44c3051697c03 100644
--- a/cc/proxy.h
+++ b/cc/proxy.h
@@ -13,12 +13,12 @@
 
 namespace gfx {
 class Rect;
+class Vector2d;
 }
 
 namespace cc {
 
 class Thread;
-class IntSize;
 struct RenderingStats;
 struct RendererCapabilities;
 
@@ -40,7 +40,7 @@ public:
 
     virtual bool compositeAndReadback(void *pixels, const gfx::Rect&) = 0;
 
-    virtual void startPageScaleAnimation(const IntSize& targetPosition, bool useAnchor, float scale, base::TimeDelta duration) = 0;
+    virtual void startPageScaleAnimation(gfx::Vector2d targetOffset, bool useAnchor, float scale, base::TimeDelta duration) = 0;
 
     virtual void finishAllRendering() = 0;