Mark layers that can use LCD text based on layer transform and opacity.

cc/layer_tree_settings.h

Index: cc/layer_tree_settings.h
diff --git a/cc/layer_tree_settings.h b/cc/layer_tree_settings.h
index 06c8b8c672d3eae0c8173eace327e54620287800..e10e0d3c7a17ee546ff7f14113224aad96629cde 100644
--- a/cc/layer_tree_settings.h
+++ b/cc/layer_tree_settings.h
@@ -26,6 +26,7 @@ class CC_EXPORT LayerTreeSettings {
   bool pageScalePinchZoomEnabled;
   bool backgroundColorInsteadOfCheckerboard;
   bool showOverdrawInTracing;
+  bool canUseLCDText;
   double refreshRate;
   size_t maxPartialTextureUpdates;
   size_t numRasterThreads;