Add debug shortcuts that toggles options to shows paint rects

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 739 matching lines @@
 Compositor::OffscreenContextProviderForMainThread() {
   return ContextFactory::GetInstance()->OffscreenContextProviderForMainThread();
 }
 
 scoped_refptr<cc::ContextProvider>
 Compositor::OffscreenContextProviderForCompositorThread() {
   return ContextFactory::GetInstance()->
       OffscreenContextProviderForCompositorThread();
 }
 
+const cc::LayerTreeDebugState& Compositor::GetLayerTreeDebugState() const {
+  return host_->debug_state();
+}
+
+void Compositor::SetLayerTreeDebugState(
+    const cc::LayerTreeDebugState& debug_state) {
+  host_->SetDebugState(debug_state);
+}
+
 scoped_refptr<CompositorLock> Compositor::GetCompositorLock() {
   if (!compositor_lock_) {
     compositor_lock_ = new CompositorLock(this);
     if (g_compositor_thread)
       host_->SetDeferCommits(true);
     FOR_EACH_OBSERVER(CompositorObserver,
                       observer_list_,
                       OnCompositingLockStateChanged(this));
   }
   return compositor_lock_;
@@ skipping 38 matching lines @@
 COMPOSITOR_EXPORT void DisableTestCompositor() {
   ResetImplicitFactory();
   g_test_compositor_enabled = false;
 }
 
 COMPOSITOR_EXPORT bool IsTestCompositorEnabled() {
   return g_test_compositor_enabled;
 }
 
 }  // namespace ui