[exp] cc: Introduce cc::CompositorMutator.

cc/trees/layer_tree_host_impl.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/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 150 matching lines @@
 
 LayerTreeHostImpl::FrameData::~FrameData() {}
 
 scoped_ptr<LayerTreeHostImpl> LayerTreeHostImpl::Create(
     const LayerTreeSettings& settings,
     LayerTreeHostImplClient* client,
     Proxy* proxy,
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     SharedBitmapManager* shared_bitmap_manager,
     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
+    CompositorMutator* compositor_mutator,
     int id) {
-  return make_scoped_ptr(new LayerTreeHostImpl(settings,
-                                               client,
-                                               proxy,
-                                               rendering_stats_instrumentation,
-                                               shared_bitmap_manager,
-                                               gpu_memory_buffer_manager,
-                                               id));
+  return make_scoped_ptr(new LayerTreeHostImpl(
+      settings, client, proxy, rendering_stats_instrumentation,
+      shared_bitmap_manager, gpu_memory_buffer_manager, compositor_mutator,
+      id));
 }
 
 LayerTreeHostImpl::LayerTreeHostImpl(
     const LayerTreeSettings& settings,
     LayerTreeHostImplClient* client,
     Proxy* proxy,
     RenderingStatsInstrumentation* rendering_stats_instrumentation,
     SharedBitmapManager* shared_bitmap_manager,
     gpu::GpuMemoryBufferManager* gpu_memory_buffer_manager,
+    CompositorMutator* compositor_mutator,
     int id)
     : client_(client),
       proxy_(proxy),
       use_gpu_rasterization_(false),
       gpu_rasterization_status_(GpuRasterizationStatus::OFF_DEVICE),
       input_handler_client_(NULL),
       did_lock_scrolling_layer_(false),
       should_bubble_scrolls_(false),
       wheel_scrolling_(false),
       scroll_affects_scroll_handler_(false),
@@ skipping 18 matching lines @@
       max_memory_needed_bytes_(0),
       zero_budget_(false),
       device_scale_factor_(1.f),
       resourceless_software_draw_(false),
       begin_impl_frame_interval_(BeginFrameArgs::DefaultInterval()),
       animation_registrar_(AnimationRegistrar::Create()),
       rendering_stats_instrumentation_(rendering_stats_instrumentation),
       micro_benchmark_controller_(this),
       shared_bitmap_manager_(shared_bitmap_manager),
       gpu_memory_buffer_manager_(gpu_memory_buffer_manager),
+      compositor_mutator_(compositor_mutator),
       id_(id),
       requires_high_res_to_draw_(false),
       is_likely_to_require_a_draw_(false),
       frame_timing_tracker_(FrameTimingTracker::Create()) {
   DCHECK(proxy_->IsImplThread());
   DidVisibilityChange(this, visible_);
   animation_registrar_->set_supports_scroll_animations(
       proxy_->SupportsImplScrolling());
 
   SetDebugState(settings.initial_debug_state);
@@ skipping 143 matching lines @@
 
 void LayerTreeHostImpl::Animate(base::TimeTicks monotonic_time) {
   if (input_handler_client_)
     input_handler_client_->Animate(monotonic_time);
   AnimatePageScale(monotonic_time);
   AnimateLayers(monotonic_time);
   AnimateScrollbars(monotonic_time);
   AnimateTopControls(monotonic_time);
 }
 
+void LayerTreeHostImpl::ApplyCustomMutations(base::TimeTicks monotonic_time) {
+  // ...
+  compositor_mutator_->ApplyCustomMutations(monotonic_time,
+                                            std::vector<Mutation>());
+  // ...
+}
+
 void LayerTreeHostImpl::PrepareTiles() {
   if (!tile_manager_)
     return;
   if (!tile_priorities_dirty_)
     return;
 
   tile_priorities_dirty_ = false;
   tile_manager_->PrepareTiles(global_tile_state_);
 
   client_->DidPrepareTiles();
@@ skipping 3071 matching lines @@
   new_target.SetToMin(layer_impl->MaxScrollOffset());
 
   curve->UpdateTarget(
       animation->TrimTimeToCurrentIteration(CurrentBeginFrameArgs().frame_time)
           .InSecondsF(),
       new_target);
 
   return true;
 }
 }  // namespace cc