cc: Calculate "can use lcd text" on the compositor thread

cc/trees/layer_tree_host_impl.cc

Index: cc/trees/layer_tree_host_impl.cc
diff --git a/cc/trees/layer_tree_host_impl.cc b/cc/trees/layer_tree_host_impl.cc
index 4c847ebf871de1f277b09c486441f2595e7b62e0..9d450b9ae1948981a6798457520badc5619c4a02 100644
--- a/cc/trees/layer_tree_host_impl.cc
+++ b/cc/trees/layer_tree_host_impl.cc
@@ -308,7 +308,8 @@ void LayerTreeHostImpl::CommitComplete() {
     // Impl-side painting needs an update immediately post-commit to have the
     // opportunity to create tilings.  Other paths can call UpdateDrawProperties
     // more lazily when needed prior to drawing.
-    sync_tree()->UpdateDrawProperties();
+    bool update_lcd_text = true;

[danakj, 2015/02/18 21:51:46]

Mind leaving a comment why it's true here?

[enne (OOO), 2015/02/18 22:16:07]

Done.

+    sync_tree()->UpdateDrawProperties(update_lcd_text);
     // Start working on newly created tiles immediately if needed.
     if (tile_manager_ && tile_priorities_dirty_)
       PrepareTiles();
@@ -1046,7 +1047,8 @@ DrawResult LayerTreeHostImpl::PrepareToDraw(FrameData* frame) {
   UMA_HISTOGRAM_CUSTOM_COUNTS(
       "Compositing.NumActiveLayers", active_tree_->NumLayers(), 1, 400, 20);
 
-  bool ok = active_tree_->UpdateDrawProperties();
+  bool update_lcd_text = false;
+  bool ok = active_tree_->UpdateDrawProperties(update_lcd_text);
   DCHECK(ok) << "UpdateDrawProperties failed during draw";
 
   // This will cause NotifyTileStateChanged() to be called for any visible tiles