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

cc/tiles/tile_manager_perftest.cc

 // Copyright 2013 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 <stddef.h>
 #include <stdint.h>
 
 #include "base/lazy_instance.h"
 #include "base/location.h"
 #include "base/memory/ptr_util.h"
@@ skipping 198 matching lines @@
     float width = std::sqrt(static_cast<float>(num_tiles_in_high_res));
     float height = num_tiles_in_high_res / width;
 
     // Adjust the width and height to account for the fact that tiles
     // are bigger than 1x1.
     LayerTreeSettings settings;
     width *= settings.default_tile_size.width();
     height *= settings.default_tile_size.height();
 
     // Ensure that we start with blank trees and no tiles.
-    host_impl()->ResetTreesForTesting();
+    host_impl()->ResetTrees();
 
     gfx::Size layer_bounds(width, height);
     gfx::Size viewport(width / 5, height / 5);
     host_impl()->SetViewportSize(viewport);
     SetupDefaultTreesWithFixedTileSize(layer_bounds,
                                        settings.default_tile_size);
 
     std::vector<FakePictureLayerImpl*> layers;
 
     // Pending layer counts as one layer.
@@ skipping 115 matching lines @@
   RunEvictionQueueConstructAndIterateTest("10_64", 10, 64);
   RunEvictionQueueConstructAndIterateTest("10_128", 10, 128);
   RunEvictionQueueConstructAndIterateTest("50_16", 50, 16);
   RunEvictionQueueConstructAndIterateTest("50_32", 50, 32);
   RunEvictionQueueConstructAndIterateTest("50_64", 50, 64);
   RunEvictionQueueConstructAndIterateTest("50_128", 50, 128);
 }
 
 }  // namespace
 }  // namespace cc