cc: Split out calcDrawEtc from drawLayers

cc/layer_impl.h

Index: cc/layer_impl.h
diff --git a/cc/layer_impl.h b/cc/layer_impl.h
index c39cd6da54ab73f0c139420874daed59f33898ed..8fd402907e2a40bf7585138419eb70ec4e2b7631 100644
--- a/cc/layer_impl.h
+++ b/cc/layer_impl.h
@@ -78,7 +78,7 @@ public:
     bool replicaHasMask() const { return m_replicaLayer && (m_maskLayer || m_replicaLayer->m_maskLayer); }
 
     LayerTreeHostImpl* layerTreeHostImpl() const { return m_layerTreeHostImpl; }
-    void setLayerTreeHostImpl(LayerTreeHostImpl* hostImpl) { m_layerTreeHostImpl = hostImpl; }
+    void setLayerTreeHostImpl(LayerTreeHostImpl* hostImpl);
 
     scoped_ptr<SharedQuadState> createSharedQuadState() const;
     // willDraw must be called before appendQuads. If willDraw is called,
@@ -161,6 +161,9 @@ public:
 
     bool showDebugBorders() const;
 
+    // These invalidate the host's render surface layer list.  The caller
+    // is responsible for calling setNeedsUpdateDrawProperties on the host
+    // so that its list can be recreated.

[danakj, 2012/12/06 19:32:20]

Thanks, this comment is very clear.

     void createRenderSurface();
     void clearRenderSurface() { m_drawProperties.render_surface.reset(); }
 
@@ -295,6 +298,8 @@ private:
     friend class TreeSynchronizer;
     void clearChildList(); // Warning: This does not preserve tree structure invariants and so is only exposed to the tree synchronizer.
 
+    void noteLayerSurfacePropertyChanged();
+    void noteLayerPropertyChanged();
     void noteLayerPropertyChangedForSubtree();
 
     // Note carefully this does not affect the current layer.