Clear renderer compositor trees if new page does not render in 4 seconds

cc/trees/layer_tree_host_impl.h

 // 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.
 
 #ifndef CC_TREES_LAYER_TREE_HOST_IMPL_H_
 #define CC_TREES_LAYER_TREE_HOST_IMPL_H_
 
 #include <stddef.h>
 
 #include <bitset>
@@ skipping 295 matching lines @@
 
   // Evict all textures by enforcing a memory policy with an allocation of 0.
   void EvictTexturesForTesting();
 
   // When blocking, this prevents client_->NotifyReadyToActivate() from being
   // called. When disabled, it calls client_->NotifyReadyToActivate()
   // immediately if any notifications had been blocked while blocking.
   virtual void BlockNotifyReadyToActivateForTesting(bool block);
 
   // Resets all of the trees to an empty state.
-  void ResetTreesForTesting();
+  void ResetTrees();
 
   size_t SourceAnimationFrameNumberForTesting() const;
 
   void RegisterScrollbarAnimationController(int scroll_layer_id);
   void UnregisterScrollbarAnimationController(int scroll_layer_id);
   ScrollbarAnimationController* ScrollbarAnimationControllerForId(
       int scroll_layer_id) const;
 
   DrawMode GetDrawMode() const;
 
@@ skipping 495 matching lines @@
 
   std::unique_ptr<PendingTreeDurationHistogramTimer>
       pending_tree_duration_timer_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHostImpl);
 };
 
 }  // namespace cc
 
 #endif  // CC_TREES_LAYER_TREE_HOST_IMPL_H_