cc: switch to new WebLayerTreeViewClient API for requesting font atlas

cc/heads_up_display_layer.h

Index: cc/heads_up_display_layer.h
diff --git a/cc/heads_up_display_layer.h b/cc/heads_up_display_layer.h
index 52de0f4daa2040ce3e7c0de130b1561e9ea5d01c..ff276b5386b1b4b13435980d8673783dad3f506c 100644
--- a/cc/heads_up_display_layer.h
+++ b/cc/heads_up_display_layer.h
@@ -23,6 +23,8 @@ public:
     virtual scoped_ptr<LayerImpl> createLayerImpl() OVERRIDE;
     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
 
+    bool hasFontAtlas() const { return m_hasFontAtlas; }
+
 protected:
     HeadsUpDisplayLayer();
 
@@ -30,6 +32,7 @@ private:
     virtual ~HeadsUpDisplayLayer();
 
     scoped_ptr<FontAtlas> m_fontAtlas;
+    bool m_hasFontAtlas;
 };
 
 }  // namespace cc