Refactor MutatorHostClient from LayerTreeHost to LayerTree.

cc/debug/invalidation_benchmark.cc

 // Copyright 2014 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/debug/invalidation_benchmark.h"
 
 #include <stdint.h>
 
 #include <algorithm>
 #include <limits>
@@ skipping 47 matching lines @@
     CHECK(false) << "Invalid mode: " << mode_string
                  << ". One of {fixed_size, layer, viewport, random} expected.";
   }
 }
 
 InvalidationBenchmark::~InvalidationBenchmark() {
 }
 
 void InvalidationBenchmark::DidUpdateLayers(LayerTreeHost* host) {
   LayerTreeHostCommon::CallFunctionForEveryLayer(
-      host, [this](Layer* layer) { layer->RunMicroBenchmark(this); });
+      host->GetLayerTree(),
+      [this](Layer* layer) { layer->RunMicroBenchmark(this); });
 }
 
 void InvalidationBenchmark::RunOnLayer(PictureLayer* layer) {
   gfx::Rect visible_layer_rect = gfx::Rect(layer->bounds());
   gfx::Transform from_screen;
   bool invertible = layer->screen_space_transform().GetInverse(&from_screen);
   if (!invertible)
     from_screen = gfx::Transform();
   gfx::Rect viewport_rect = MathUtil::ProjectEnclosingClippedRect(
       from_screen, gfx::Rect(layer->layer_tree_host()->device_viewport_size()));
@@ skipping 54 matching lines @@
 // high quality, but they need to be identical in each run. Therefore, we use a
 // LCG and keep the state locally in the benchmark.
 float InvalidationBenchmark::LCGRandom() {
   const uint32_t a = 1664525;
   const uint32_t c = 1013904223;
   seed_ = a * seed_ + c;
   return static_cast<float>(seed_) / std::numeric_limits<uint32_t>::max();
 }
 
 }  // namespace cc