Move SharedRendererState ownership to AwContents

android_webview/browser/shared_renderer_state.h

 // 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.
 
 #ifndef ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_
 #define ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_
 
 #include <map>
 
 #include "android_webview/browser/gl_view_renderer_manager.h"
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/single_thread_task_runner.h"
 #include "base/synchronization/lock.h"
 #include "cc/output/compositor_frame_ack.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 
 struct AwDrawGLInfo;
-
 namespace android_webview {
 
 namespace internal {
 class RequestDrawGLTracker;
 }
 
-class BrowserViewRenderer;
+class SharedRendererStateClient;
 class ChildFrame;
 class HardwareRenderer;
 class InsideHardwareReleaseReset;
 
 // This class is used to pass data between UI thread and RenderThread.
 class SharedRendererState {
  public:
   struct ReturnedResources {
     ReturnedResources();
     ~ReturnedResources();
 
     uint32_t output_surface_id;
     cc::ReturnedResourceArray resources;
   };
   using ReturnedResourcesMap = std::map<uint32_t, ReturnedResources>;
 
   SharedRendererState(
-      const scoped_refptr<base::SingleThreadTaskRunner>& ui_loop,
-      BrowserViewRenderer* browser_view_renderer);
+      SharedRendererStateClient* client,
+      const scoped_refptr<base::SingleThreadTaskRunner>& ui_loop);
   ~SharedRendererState();
 
   // This function can be called from any thread.
   void ClientRequestDrawGL(bool for_idle);
 
   // UI thread methods.
   void SetScrollOffsetOnUI(gfx::Vector2d scroll_offset);
-  void SetCompositorFrameOnUI(scoped_ptr<ChildFrame> frame);
+  void SetFrameOnUI(scoped_ptr<ChildFrame> frame);
   void InitializeHardwareDrawIfNeededOnUI();
-  void ReleaseHardwareDrawIfNeededOnUI();
   ParentCompositorDrawConstraints GetParentDrawConstraintsOnUI() const;
   void SwapReturnedResourcesOnUI(ReturnedResourcesMap* returned_resource_map);
   bool ReturnedResourcesEmptyOnUI() const;
   scoped_ptr<ChildFrame> PassUncommittedFrameOnUI();
+  bool HasFrameOnUI() const;
+  void TrimMemoryOnUI(int level);
   void DeleteHardwareRendererOnUI();
-  bool HasFrameOnUI() const;
 
   // RT thread methods.
   gfx::Vector2d GetScrollOffsetOnRT();
-  scoped_ptr<ChildFrame> PassCompositorFrameOnRT();
+  scoped_ptr<ChildFrame> PassFrameOnRT();
   void DrawGL(AwDrawGLInfo* draw_info);
   void PostExternalDrawConstraintsToChildCompositorOnRT(
       const ParentCompositorDrawConstraints& parent_draw_constraints);
   void InsertReturnedResourcesOnRT(const cc::ReturnedResourceArray& resources,
                                    uint32_t compositor_id,
                                    uint32_t output_surface_id);
 
  private:
   friend class internal::RequestDrawGLTracker;
   class InsideHardwareReleaseReset {
    public:
     explicit InsideHardwareReleaseReset(
         SharedRendererState* shared_renderer_state);
     ~InsideHardwareReleaseReset();
 
    private:
     SharedRendererState* shared_renderer_state_;
   };
 
   // RT thread method.
   void DidDrawGLProcess();
 
   // UI thread methods.
   void ResetRequestDrawGLCallback();
   void ClientRequestDrawGLOnUI();
   void UpdateParentDrawConstraintsOnUI();
   bool IsInsideHardwareRelease() const;
   void SetInsideHardwareRelease(bool inside);
-  void ReleaseCompositorResourcesIfNeededOnUI(bool release_hardware_draw);
 
   // Accessed by UI thread.
   scoped_refptr<base::SingleThreadTaskRunner> ui_loop_;
-  BrowserViewRenderer* browser_view_renderer_;
+  SharedRendererStateClient* client_;

[boliu, 2016/03/24 17:34:45]

SRSC* const client_

   base::WeakPtr<SharedRendererState> ui_thread_weak_ptr_;
   base::CancelableClosure request_draw_gl_cancelable_closure_;
 
   // Accessed by RT thread.
   scoped_ptr<HardwareRenderer> hardware_renderer_;
 
   // This is accessed by both UI and RT now. TODO(hush): move to RT only.
   GLViewRendererManager::Key renderer_manager_key_;
 
   // Accessed by both UI and RT thread.
   mutable base::Lock lock_;
   bool hardware_renderer_has_frame_;
   gfx::Vector2d scroll_offset_;
   scoped_ptr<ChildFrame> child_frame_;
   bool inside_hardware_release_;
   ParentCompositorDrawConstraints parent_draw_constraints_;
   ReturnedResourcesMap returned_resources_map_;
   base::Closure request_draw_gl_closure_;
 
   base::WeakPtrFactory<SharedRendererState> weak_factory_on_ui_thread_;
 
   DISALLOW_COPY_AND_ASSIGN(SharedRendererState);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_