Rename composited selection anchor/focus to start/end

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 1d23c6c7325698ef78a64aa07711c6539573b74c..89dfe783db0029e826e6ecedd09f9768ec9ccb54 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -179,8 +179,8 @@ class CC_EXPORT LayerTreeHost {
     return outer_viewport_scroll_layer_.get();
   }
 
-  void RegisterSelection(const LayerSelectionBound& anchor,
-                         const LayerSelectionBound& focus);
+  void RegisterSelection(const LayerSelectionBound& start,
+                         const LayerSelectionBound& end);
 
   const LayerTreeSettings& settings() const { return settings_; }
 
@@ -443,8 +443,8 @@ class CC_EXPORT LayerTreeHost {
   scoped_refptr<Layer> inner_viewport_scroll_layer_;
   scoped_refptr<Layer> outer_viewport_scroll_layer_;
 
-  LayerSelectionBound selection_anchor_;
-  LayerSelectionBound selection_focus_;
+  LayerSelectionBound selection_start_;
+  LayerSelectionBound selection_end_;
 
   SharedBitmapManager* shared_bitmap_manager_;