cc: Merge LayerTree into the LayerTreeHost.

cc/trees/layer_tree_host.h

Index: cc/trees/layer_tree_host.h
diff --git a/cc/trees/layer_tree_host.h b/cc/trees/layer_tree_host.h
index 7beade48d5a39f1e6d750b8210de60a7c097d780..05c060151ff14a341d6bd5d44e71b52317dc980a 100644
--- a/cc/trees/layer_tree_host.h
+++ b/cc/trees/layer_tree_host.h
@@ -36,9 +36,9 @@
 #include "cc/surfaces/surface_reference_owner.h"
 #include "cc/surfaces/surface_sequence_generator.h"
 #include "cc/trees/compositor_mode.h"
-#include "cc/trees/layer_tree.h"
 #include "cc/trees/layer_tree_host_client.h"
 #include "cc/trees/layer_tree_settings.h"
+#include "cc/trees/mutator_host.h"
 #include "cc/trees/proxy.h"
 #include "cc/trees/swap_promise_manager.h"
 #include "cc/trees/target_property.h"
@@ -46,22 +46,24 @@
 #include "ui/gfx/geometry/rect.h"
 
 namespace cc {
-class MutatorEvents;
+class HeadsUpDisplayLayer;
 class Layer;
 class LayerTreeHostClient;
 class LayerTreeHostImpl;
 class LayerTreeHostImplClient;
 class LayerTreeHostSingleThreadClient;
 class LayerTreeMutator;
+class MutatorEvents;
 class MutatorHost;
+struct PendingPageScaleAnimation;
 class RenderingStatsInstrumentation;
 class TaskGraphRunner;
 class UIResourceManager;
 struct RenderingStats;
 struct ScrollAndScaleSet;
 
-class CC_EXPORT LayerTreeHost
-    : public NON_EXPORTED_BASE(SurfaceReferenceOwner) {
+class CC_EXPORT LayerTreeHost : public NON_EXPORTED_BASE(SurfaceReferenceOwner),
+                                public NON_EXPORTED_BASE(MutatorHostClient) {
  public:
   // TODO(sad): InitParams should be a movable type so that it can be
   // std::move()d to the Create* functions.
@@ -94,11 +96,6 @@ class CC_EXPORT LayerTreeHost
   // update(commit) pushed to the compositor thread.
   int SourceFrameNumber() const;
 
-  // Returns the LayerTree that holds the main frame state pushed to the
-  // LayerTreeImpl on commit.
-  LayerTree* GetLayerTree();
-  const LayerTree* GetLayerTree() const;
-
   // Returns the UIResourceManager used to create UIResources for
   // UIResourceLayers pushed to the LayerTree.
   UIResourceManager* GetUIResourceManager() const;
@@ -235,8 +232,143 @@ class CC_EXPORT LayerTreeHost
   // Calling this will reset it back to not suitable state.
   void ResetGpuRasterizationTracking();
 
-  // SurfaceReferenceOwner implementation.
-  SurfaceSequenceGenerator* GetSurfaceSequenceGenerator() override;
+  void SetRootLayer(scoped_refptr<Layer> root_layer);
+  Layer* root_layer() { return root_layer_.get(); }
+  const Layer* root_layer() const { return root_layer_.get(); }
+
+  void RegisterViewportLayers(scoped_refptr<Layer> overscroll_elasticity_layer,
+                              scoped_refptr<Layer> page_scale_layer,
+                              scoped_refptr<Layer> inner_viewport_scroll_layer,
+                              scoped_refptr<Layer> outer_viewport_scroll_layer);
+
+  Layer* overscroll_elasticity_layer() const {
+    return overscroll_elasticity_layer_.get();
+  }
+  Layer* page_scale_layer() const { return page_scale_layer_.get(); }
+  Layer* inner_viewport_scroll_layer() const {
+    return inner_viewport_scroll_layer_.get();
+  }
+  Layer* outer_viewport_scroll_layer() const {
+    return outer_viewport_scroll_layer_.get();
+  }
+
+  void RegisterSelection(const LayerSelection& selection);
+  const LayerSelection& selection() const { return selection_; }
+
+  void SetHaveScrollEventHandlers(bool have_event_handlers);
+  bool have_scroll_event_handlers() const {
+    return have_scroll_event_handlers_;
+  }
+
+  void SetEventListenerProperties(EventListenerClass event_class,
+                                  EventListenerProperties event_properties);
+  EventListenerProperties event_listener_properties(
+      EventListenerClass event_class) const {
+    return event_listener_properties_[static_cast<size_t>(event_class)];
+  }
+
+  void SetViewportSize(const gfx::Size& device_viewport_size);
+  gfx::Size device_viewport_size() const { return device_viewport_size_; }
+
+  void SetBrowserControlsHeight(float height, bool shrink);
+  void SetBrowserControlsShownRatio(float ratio);
+  void SetBottomControlsHeight(float height);
+
+  void SetPageScaleFactorAndLimits(float page_scale_factor,
+                                   float min_page_scale_factor,
+                                   float max_page_scale_factor);
+  float page_scale_factor() const { return page_scale_factor_; }
+  float min_page_scale_factor() const { return min_page_scale_factor_; }
+  float max_page_scale_factor() const { return max_page_scale_factor_; }
+
+  void set_background_color(SkColor color) { background_color_ = color; }
+  SkColor background_color() const { return background_color_; }
+
+  void set_has_transparent_background(bool transparent) {
+    has_transparent_background_ = transparent;
+  }
+  bool has_transparent_background() const {
+    return has_transparent_background_;
+  }
+
+  void StartPageScaleAnimation(const gfx::Vector2d& target_offset,
+                               bool use_anchor,
+                               float scale,
+                               base::TimeDelta duration);
+  bool HasPendingPageScaleAnimation() const;
+
+  void SetDeviceScaleFactor(float device_scale_factor);
+  float device_scale_factor() const { return device_scale_factor_; }
+
+  void SetPaintedDeviceScaleFactor(float painted_device_scale_factor);
+  float painted_device_scale_factor() const {
+    return painted_device_scale_factor_;
+  }
+
+  void SetDeviceColorSpace(const gfx::ColorSpace& device_color_space);
+  const gfx::ColorSpace& device_color_space() const {
+    return device_color_space_;
+  }
+
+  // Used externally by blink for setting the PropertyTrees when
+  // |settings_.use_layer_lists| is true. This is a SPV2 setting.
+  PropertyTrees* property_trees() { return &property_trees_; }
+
+  void SetNeedsDisplayOnAllLayers();
+
+  void RegisterLayer(Layer* layer);
+  void UnregisterLayer(Layer* layer);
+  Layer* LayerById(int id) const;
+
+  size_t NumLayers() const;
+
+  bool UpdateLayers(const LayerList& update_layer_list,
+                    bool* content_is_suitable_for_gpu);
+  bool in_paint_layer_contents() const { return in_paint_layer_contents_; }
+
+  void AddLayerShouldPushProperties(Layer* layer);
+  void RemoveLayerShouldPushProperties(Layer* layer);
+  std::unordered_set<Layer*>& LayersThatShouldPushProperties();
+  bool LayerNeedsPushPropertiesForTesting(Layer* layer) const;
+
+  virtual void SetNeedsMetaInfoRecomputation(
+      bool needs_meta_info_recomputation);
+  bool needs_meta_info_recomputation() const {
+    return needs_meta_info_recomputation_;
+  }
+
+  void SetPageScaleFromImplSide(float page_scale);
+  void SetElasticOverscrollFromImplSide(gfx::Vector2dF elastic_overscroll);
+  gfx::Vector2dF elastic_overscroll() const { return elastic_overscroll_; }
+
+  void UpdateHudLayer(bool show_hud_info);
+  HeadsUpDisplayLayer* hud_layer() const { return hud_layer_.get(); }
+
+  virtual void SetNeedsFullTreeSync();
+  bool needs_full_tree_sync() const { return needs_full_tree_sync_; }
+
+  void SetPropertyTreesNeedRebuild();
+
+  void PushPropertiesTo(LayerTreeImpl* tree_impl);
+
+  MutatorHost* mutator_host() const { return mutator_host_; }
+
+  Layer* LayerByElementId(ElementId element_id) const;
+  void RegisterElement(ElementId element_id,
+                       ElementListType list_type,
+                       Layer* layer);
+  void UnregisterElement(ElementId element_id,
+                         ElementListType list_type,
+                         Layer* layer);
+  void SetElementIdsForTesting();
+
+  void BuildPropertyTreesForTesting();
+
+  // Layer iterators.
+  LayerListIterator<Layer> begin() const;
+  LayerListIterator<Layer> end() const;
+  LayerListReverseIterator<Layer> rbegin();
+  LayerListReverseIterator<Layer> rend();
 
   // LayerTreeHostInProcess interface to Proxy.
   void WillBeginMainFrame();
@@ -286,11 +418,38 @@ class CC_EXPORT LayerTreeHost
   bool IsSingleThreaded() const;
   bool IsThreaded() const;
 
+  // SurfaceReferenceOwner implementation.
+  SurfaceSequenceGenerator* GetSurfaceSequenceGenerator() override;
+
+  // MutatorHostClient implementation.
+  bool IsElementInList(ElementId element_id,
+                       ElementListType list_type) const override;
+  void SetMutatorsNeedCommit() override;
+  void SetMutatorsNeedRebuildPropertyTrees() override;
+  void SetElementFilterMutated(ElementId element_id,
+                               ElementListType list_type,
+                               const FilterOperations& filters) override;
+  void SetElementOpacityMutated(ElementId element_id,
+                                ElementListType list_type,
+                                float opacity) override;
+  void SetElementTransformMutated(ElementId element_id,
+                                  ElementListType list_type,
+                                  const gfx::Transform& transform) override;
+  void SetElementScrollOffsetMutated(
+      ElementId element_id,
+      ElementListType list_type,
+      const gfx::ScrollOffset& scroll_offset) override;
+
+  void ElementIsAnimatingChanged(ElementId element_id,
+                                 ElementListType list_type,
+                                 const PropertyAnimationState& mask,
+                                 const PropertyAnimationState& state) override;
+
+  void ScrollOffsetAnimationFinished() override {}
+  gfx::ScrollOffset GetScrollOffsetForAnimation(
+      ElementId element_id) const override;
+
  protected:
-  // Allow tests to inject the LayerTree.
-  LayerTreeHost(InitParams* params,
-                CompositorMode mode,
-                std::unique_ptr<LayerTree> layer_tree);
   LayerTreeHost(InitParams* params, CompositorMode mode);
 
   void InitializeThreaded(
@@ -317,8 +476,6 @@ class CC_EXPORT LayerTreeHost
 
   MicroBenchmarkController micro_benchmark_controller_;
 
-  std::unique_ptr<LayerTree> layer_tree_;
-
   base::WeakPtr<InputHandler> input_handler_weak_ptr_;
 
  private:
@@ -339,8 +496,6 @@ class CC_EXPORT LayerTreeHost
 
   void CalculateLCDTextMetricsCallback(Layer* layer);
 
-  void SetPropertyTreesNeedRebuild();
-
   const CompositorMode compositor_mode_;
 
   std::unique_ptr<UIResourceManager> ui_resource_manager_;
@@ -349,7 +504,7 @@ class CC_EXPORT LayerTreeHost
   std::unique_ptr<Proxy> proxy_;
   std::unique_ptr<TaskRunnerProvider> task_runner_provider_;
 
-  int source_frame_number_;
+  int source_frame_number_ = 0U;
   std::unique_ptr<RenderingStatsInstrumentation>
       rendering_stats_instrumentation_;
 
@@ -366,15 +521,15 @@ class CC_EXPORT LayerTreeHost
   const LayerTreeSettings settings_;
   LayerTreeDebugState debug_state_;
 
-  bool visible_;
+  bool visible_ = false;
 
-  bool has_gpu_rasterization_trigger_;
-  bool content_is_suitable_for_gpu_rasterization_;
-  bool gpu_rasterization_histogram_recorded_;
+  bool has_gpu_rasterization_trigger_ = false;
+  bool content_is_suitable_for_gpu_rasterization_ = true;
+  bool gpu_rasterization_histogram_recorded_ = false;
 
   // If set, then page scale animation has completed, but the client hasn't been
   // notified about it yet.
-  bool did_complete_scale_animation_;
+  bool did_complete_scale_animation_ = false;
 
   int id_;
   bool next_commit_forces_redraw_ = false;
@@ -388,6 +543,60 @@ class CC_EXPORT LayerTreeHost
   SurfaceSequenceGenerator surface_sequence_generator_;
   uint32_t num_consecutive_frames_suitable_for_gpu_ = 0;
 
+  scoped_refptr<Layer> root_layer_;
+
+  scoped_refptr<Layer> overscroll_elasticity_layer_;
+  scoped_refptr<Layer> page_scale_layer_;
+  scoped_refptr<Layer> inner_viewport_scroll_layer_;
+  scoped_refptr<Layer> outer_viewport_scroll_layer_;
+
+  float top_controls_height_ = 0.f;
+  float top_controls_shown_ratio_ = 0.f;
+  bool browser_controls_shrink_blink_size_ = false;
+
+  float bottom_controls_height_ = 0.f;
+
+  float device_scale_factor_ = 1.f;
+  float painted_device_scale_factor_ = 1.f;
+  float page_scale_factor_ = 1.f;
+  float min_page_scale_factor_ = 1.f;
+  float max_page_scale_factor_ = 1.f;
+  gfx::ColorSpace device_color_space_;
+
+  SkColor background_color_ = SK_ColorWHITE;
+  bool has_transparent_background_ = false;
+
+  LayerSelection selection_;
+
+  gfx::Size device_viewport_size_;
+
+  bool have_scroll_event_handlers_ = false;
+  EventListenerProperties event_listener_properties_[static_cast<size_t>(
+      EventListenerClass::kNumClasses)];
+
+  std::unique_ptr<PendingPageScaleAnimation> pending_page_scale_animation_;
+
+  PropertyTrees property_trees_;
+
+  bool needs_full_tree_sync_ = true;
+  bool needs_meta_info_recomputation_ = true;
+
+  gfx::Vector2dF elastic_overscroll_;
+
+  scoped_refptr<HeadsUpDisplayLayer> hud_layer_;
+
+  // Set of layers that need to push properties.
+  std::unordered_set<Layer*> layers_that_should_push_properties_;
+
+  // Layer id to Layer map.
+  std::unordered_map<int, Layer*> layer_id_map_;
+
+  std::unordered_map<ElementId, Layer*, ElementIdHash> element_layers_map_;
+
+  bool in_paint_layer_contents_ = false;
+
+  MutatorHost* mutator_host_;
+
   scoped_refptr<base::SequencedTaskRunner> image_worker_task_runner_;
 
   DISALLOW_COPY_AND_ASSIGN(LayerTreeHost);