cc: Cleanup Layer::SetNeedsDisplayInRect

cc/layers/layer.cc

Index: cc/layers/layer.cc
diff --git a/cc/layers/layer.cc b/cc/layers/layer.cc
index 5e7bd77ecc9ee5fa31359d0d78e6980f529f7fc3..fc9f2daba445f1b78b01dc5a3c2624a620663b95 100644
--- a/cc/layers/layer.cc
+++ b/cc/layers/layer.cc
@@ -663,13 +663,13 @@ void Layer::SetHideLayerAndSubtree(bool hide) {
 }
 
 void Layer::SetNeedsDisplayRect(const gfx::RectF& dirty_rect) {
+  if (dirty_rect.IsEmpty())
+    return;
+
   update_rect_.Union(dirty_rect);
   needs_display_ = true;
 
-  // Simply mark the contents as dirty. For non-root layers, the call to
-  // SetNeedsCommit will schedule a fresh compositing pass.
-  // For the root layer, SetNeedsCommit has no effect.
-  if (DrawsContent() && !update_rect_.IsEmpty())
+  if (DrawsContent())
     SetNeedsCommit();
 }