Revert of ui: Clean up damaged rects and clear them after painting.

ui/compositor/compositor.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "ui/compositor/compositor.h"
 
 #include <algorithm>
 #include <deque>
 
 #include "base/bind.h"
@@ skipping 308 matching lines @@
   FOR_EACH_OBSERVER(CompositorAnimationObserver,
                     animation_observer_list_,
                     OnAnimationStep(args.frame_time));
   if (animation_observer_list_.might_have_observers())
     host_->SetNeedsAnimate();
 }
 
 void Compositor::BeginMainFrameNotExpectedSoon() {
 }
 
-static void SendDamagedRectsRecursive(ui::Layer* layer) {
-  layer->SendDamagedRects();
-  for (auto* child : layer->children())
-    SendDamagedRectsRecursive(child);
-}
-
 void Compositor::Layout() {
-  if (!root_layer())
-    return;
-  SendDamagedRectsRecursive(root_layer());
+  if (root_layer_)
+    root_layer_->SendDamagedRects();
 }
 
 void Compositor::RequestNewOutputSurface() {
   // TODO(robliao): Remove ScopedTracker below once https://crbug.com/466870
   // is fixed.
   tracked_objects::ScopedTracker tracking_profile(
       FROM_HERE_WITH_EXPLICIT_FUNCTION(
           "466870 Compositor::RequestNewOutputSurface"));
 
   context_factory_->CreateOutputSurface(weak_ptr_factory_.GetWeakPtr());
@@ skipping 75 matching lines @@
                     observer_list_,
                     OnCompositingLockStateChanged(this));
 }
 
 void Compositor::CancelCompositorLock() {
   if (compositor_lock_)
     compositor_lock_->CancelLock();
 }
 
 }  // namespace ui