Revert of cc: Delete all the RendererCapabilities.

cc/trees/proxy.h

Index: cc/trees/proxy.h
diff --git a/cc/trees/proxy.h b/cc/trees/proxy.h
index 54a3770fcb515352dbe01acb98a320bf587c6fb4..be3a1ec11b17dccf642b7eac2167df57dabfe119 100644
--- a/cc/trees/proxy.h
+++ b/cc/trees/proxy.h
@@ -28,6 +28,7 @@
 class LayerTreeDebugState;
 class LayerTreeMutator;
 class OutputSurface;
+struct RendererCapabilities;
 
 // Abstract interface responsible for proxying commands from the main-thread
 // side of the compositor over to the compositor implementation.
@@ -45,6 +46,8 @@
   virtual void ReleaseOutputSurface() = 0;
 
   virtual void SetVisible(bool visible) = 0;
+
+  virtual const RendererCapabilities& GetRendererCapabilities() const = 0;
 
   virtual void SetNeedsAnimate() = 0;
   virtual void SetNeedsUpdateLayers() = 0;