Refactor CCLayerTreeHostCommon - merge visible rect computation into calc draw transforms.

cc/CCOcclusionTrackerTest.cpp

Index: cc/CCOcclusionTrackerTest.cpp
diff --git a/cc/CCOcclusionTrackerTest.cpp b/cc/CCOcclusionTrackerTest.cpp
index 627e63b923b54bdf0d78c9485ab8c5f0e26ecc27..ccc135546b3256664a961260138b82d82f9591d6 100644
--- a/cc/CCOcclusionTrackerTest.cpp
+++ b/cc/CCOcclusionTrackerTest.cpp
@@ -241,7 +241,6 @@ protected:
         ASSERT(!root->renderSurface());
 
         CCLayerTreeHostCommon::calculateDrawTransforms(root, root->bounds(), 1, &layerSorter, dummyMaxTextureSize, m_renderSurfaceLayerListImpl);
-        CCLayerTreeHostCommon::calculateVisibleRects(m_renderSurfaceLayerListImpl);
 
         m_layerIterator = m_layerIteratorBegin = Types::LayerIterator::begin(&m_renderSurfaceLayerListImpl);
     }
@@ -254,7 +253,6 @@ protected:
         ASSERT(!root->renderSurface());
 
         CCLayerTreeHostCommon::calculateDrawTransforms(root, root->bounds(), 1, dummyMaxTextureSize, m_renderSurfaceLayerListChromium);
-        CCLayerTreeHostCommon::calculateVisibleRects(m_renderSurfaceLayerListChromium);
 
         m_layerIterator = m_layerIteratorBegin = Types::LayerIterator::begin(&m_renderSurfaceLayerListChromium);
     }