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 d980cfcf2027101c00788701a5c226ca46752291..0a16d0f719fd7875f6d01d5cdaf1a3ae2cf7b8da 100644
--- a/cc/heads_up_display_layer.h
+++ b/cc/heads_up_display_layer.h
@@ -24,6 +24,8 @@ public:
     virtual scoped_ptr<LayerImpl> createLayerImpl() OVERRIDE;
     virtual void pushPropertiesTo(LayerImpl*) OVERRIDE;
 
+    bool hasFontAtlas() const { return m_hasFontAtlas; }
+
 protected:
     HeadsUpDisplayLayer();
 
@@ -32,6 +34,8 @@ private:
 
     scoped_ptr<FontAtlas> m_fontAtlas;
     bool m_showFPSCounter;
+
+    bool m_hasFontAtlas;
 };
 
 }  // namespace cc