cc: switch to new WebLayerTreeViewClient API for requesting font atlas

cc/layer_tree_host_client.h

Index: cc/layer_tree_host_client.h
diff --git a/cc/layer_tree_host_client.h b/cc/layer_tree_host_client.h
index f6cb7028ab18606bdeca5d4e0c38107e6bc453fb..ad2844339e3c735aa1d0a59ae325323719ba6a2c 100644
--- a/cc/layer_tree_host_client.h
+++ b/cc/layer_tree_host_client.h
@@ -16,6 +16,7 @@ class WebCompositorOutputSurface;
 }
 
 namespace cc {
+class FontAtlas;
 class InputHandler;
 
 class LayerTreeHostClient {
@@ -37,6 +38,9 @@ public:
     // Used only in the single-threaded path.
     virtual void scheduleComposite() = 0;
 
+    // Creates a font atlas to use for debug visualizations.
+    virtual scoped_ptr<FontAtlas> createFontAtlas() = 0;
+
 protected:
     virtual ~LayerTreeHostClient() { }
 };