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

cc/thread_proxy.cc

Index: cc/thread_proxy.cc
diff --git a/cc/thread_proxy.cc b/cc/thread_proxy.cc
index ac58216e651e66277fc41e6bac8bc508816f4c4c..76272e708a75164748a8d6223b7ce7500c9ba9bd 100644
--- a/cc/thread_proxy.cc
+++ b/cc/thread_proxy.cc
@@ -117,17 +117,17 @@ void ThreadProxy::requestReadbackOnImplThread(ReadbackRequest* request)
     m_schedulerOnImplThread->setNeedsForcedRedraw();
 }
 
-void ThreadProxy::startPageScaleAnimation(const IntSize& targetPosition, bool useAnchor, float scale, base::TimeDelta duration)
+void ThreadProxy::startPageScaleAnimation(gfx::Vector2d targetOffset, bool useAnchor, float scale, base::TimeDelta duration)
 {
     DCHECK(Proxy::isMainThread());
-    Proxy::implThread()->postTask(base::Bind(&ThreadProxy::requestStartPageScaleAnimationOnImplThread, base::Unretained(this), targetPosition, useAnchor, scale, duration));
+    Proxy::implThread()->postTask(base::Bind(&ThreadProxy::requestStartPageScaleAnimationOnImplThread, base::Unretained(this), targetOffset, useAnchor, scale, duration));
 }
 
-void ThreadProxy::requestStartPageScaleAnimationOnImplThread(IntSize targetPosition, bool useAnchor, float scale, base::TimeDelta duration)
+void ThreadProxy::requestStartPageScaleAnimationOnImplThread(gfx::Vector2d targetOffset, bool useAnchor, float scale, base::TimeDelta duration)
 {
     DCHECK(Proxy::isImplThread());
     if (m_layerTreeHostImpl.get())
-        m_layerTreeHostImpl->startPageScaleAnimation(targetPosition, useAnchor, scale, base::TimeTicks::Now(), duration);
+        m_layerTreeHostImpl->startPageScaleAnimation(targetOffset, useAnchor, scale, base::TimeTicks::Now(), duration);
 }
 
 void ThreadProxy::finishAllRendering()