cc: switch to new WebLayerTreeViewClient API for requesting font atlas

cc/heads_up_display_layer.cc

Index: cc/heads_up_display_layer.cc
diff --git a/cc/heads_up_display_layer.cc b/cc/heads_up_display_layer.cc
index 374e650e777ff5f346219341b07535ec9b93fd95..8601680a526b0e1ea989582e0fbf121f22b49621 100644
--- a/cc/heads_up_display_layer.cc
+++ b/cc/heads_up_display_layer.cc
@@ -18,6 +18,7 @@ scoped_refptr<HeadsUpDisplayLayer> HeadsUpDisplayLayer::create()
 HeadsUpDisplayLayer::HeadsUpDisplayLayer()
     : Layer()
     , m_showFPSCounter(false)
+    , m_hasFontAtlas(false)
 {
     setBounds(gfx::Size(256, 128));
 }
@@ -57,6 +58,7 @@ void HeadsUpDisplayLayer::setFontAtlas(scoped_ptr<FontAtlas> fontAtlas)
 {
     m_fontAtlas = fontAtlas.Pass();
     setNeedsCommit();
+    m_hasFontAtlas = true;
 }
 
 void HeadsUpDisplayLayer::setShowFPSCounter(bool show)