cc: Avoid updating animations in the background without an active tree

cc/test/layer_tree_test.cc

 // Copyright 2011 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 "cc/test/layer_tree_test.h"
 
 #include "base/command_line.h"
 #include "cc/animation/animation.h"
 #include "cc/animation/animation_registrar.h"
 #include "cc/animation/layer_animation_controller.h"
@@ skipping 19 matching lines @@
 TestHooks::TestHooks() {}
 
 TestHooks::~TestHooks() {}
 
 bool TestHooks::PrepareToDrawOnThread(LayerTreeHostImpl* host_impl,
                                       LayerTreeHostImpl::FrameData* frame_data,
                                       bool result) {
   return true;
 }
 
+base::TimeDelta TestHooks::LowFrequencyAnimationInterval() const {
+  return base::TimeDelta::FromMilliseconds(16);
+}
+
 // Adapts LayerTreeHostImpl for test. Runs real code, then invokes test hooks.
 class LayerTreeHostImplForTesting : public LayerTreeHostImpl {
  public:
   static scoped_ptr<LayerTreeHostImplForTesting> Create(
       TestHooks* test_hooks,
       const LayerTreeSettings& settings,
       LayerTreeHostImplClient* host_impl_client,
       Proxy* proxy,
       RenderingStatsInstrumentation* stats_instrumentation) {
     return make_scoped_ptr(
@@ skipping 112 matching lines @@
     for (; iter != active_animation_controllers().end(); ++iter) {
       if (iter->second->HasActiveAnimation()) {
         has_unfinished_animation = true;
         break;
       }
     }
     test_hooks_->UpdateAnimationState(this, has_unfinished_animation);
   }
 
   virtual base::TimeDelta LowFrequencyAnimationInterval() const OVERRIDE {
-    return base::TimeDelta::FromMilliseconds(16);
+    return test_hooks_->LowFrequencyAnimationInterval();
   }
 
  private:
   TestHooks* test_hooks_;
   bool block_notify_ready_to_activate_for_testing_;
   bool notify_ready_to_activate_was_blocked_;
 };
 
 // Adapts LayerTreeHost for test. Injects LayerTreeHostImplForTesting.
 class LayerTreeHostForTesting : public cc::LayerTreeHost {
@@ skipping 444 matching lines @@
 
 scoped_refptr<cc::ContextProvider> LayerTreeTest::
     OffscreenContextProviderForCompositorThread() {
   if (!compositor_thread_contexts_.get() ||
       compositor_thread_contexts_->DestroyedOnMainThread())
     compositor_thread_contexts_ = TestContextProvider::Create();
   return compositor_thread_contexts_;
 }
 
 }  // namespace cc