[Android WebView] Implement Ubercomp for Render Thread support

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 <queue>
 
 #include "base/callback.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/synchronization/lock.h"
+#include "cc/output/compositor_frame.h"
+#include "cc/output/compositor_frame_ack.h"
 #include "content/public/browser/android/synchronous_compositor.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/geometry/vector2d.h"
 
+namespace cc {
+class CompositorFrameAck;
+}
+
+namespace gpu {
+class GLInProcessContext;
+}
+
 namespace android_webview {
 
 class BrowserViewRendererClient;
 
 // Set by BrowserViewRenderer and read by HardwareRenderer.
 struct DrawGLInput {
-  unsigned int frame_id;
   gfx::Rect global_visible_rect;
   gfx::Vector2d scroll_offset;
   int width;
   int height;
+  cc::CompositorFrame frame;
 
   DrawGLInput();
+  ~DrawGLInput();
 };
 
 // Set by HardwareRenderer and read by BrowserViewRenderer.
 struct DrawGLResult {
-  unsigned int frame_id;
   bool clip_contains_visible_rect;
 
   DrawGLResult();
 };
 
 // This class holds renderer state that is shared between UI and RT threads.
 // Android framework will block the UI thread when RT is drawing, so no locking
 // is needed in this class. In the interim, this class is also responsible for
 // thread hopping that should eventually be removed once RT support work is
 // complete.
 class SharedRendererState {
  public:
   SharedRendererState(scoped_refptr<base::MessageLoopProxy> ui_loop,
                       BrowserViewRendererClient* client);
   ~SharedRendererState();
 
   void ClientRequestDrawGL();
 
   // This function should only be called on UI thread.
   void SetCompositorOnUiThread(content::SynchronousCompositor* compositor);
 
   // This function can be called on both UI and RT thread.
   content::SynchronousCompositor* GetCompositor();
 
   void SetMemoryPolicy(const content::SynchronousCompositorMemoryPolicy policy);
   content::SynchronousCompositorMemoryPolicy GetMemoryPolicy() const;
 
   void SetMemoryPolicyDirty(bool is_dirty);
   bool IsMemoryPolicyDirty() const;
-  void SetDrawGLInput(const DrawGLInput& input);
-  DrawGLInput GetDrawGLInput() const;
+  void SetDrawGLInput(scoped_ptr<DrawGLInput> input);
+  scoped_ptr<DrawGLInput> PassDrawGLInput();
 
   void ClearClosureQueue();
   void AppendClosure(const base::Closure& closure);
   // Will return empty closure if queue empty.
   base::Closure PopFrontClosure();
 
   void SetHardwareInitialized(bool initialized);
   bool IsHardwareInitialized() const;
 
+  void SetSharedContext(gpu::GLInProcessContext* context);
+  gpu::GLInProcessContext* GetSharedContext() const;
+
+  void ReturnResources(const cc::TransferableResourceArray& input);
+  void InsertReturnedResources(const cc::ReturnedResourceArray& resources);
+  void SwapReturnedResources(cc::ReturnedResourceArray* resources);
+  bool ReturnedResourcesEmpty() const;
+
  private:
   void ClientRequestDrawGLOnUIThread();
 
   scoped_refptr<base::MessageLoopProxy> ui_loop_;
   // TODO(boliu): Remove |client_on_ui_| from shared state.
   BrowserViewRendererClient* client_on_ui_;
   base::WeakPtrFactory<SharedRendererState> weak_factory_on_ui_thread_;
   base::WeakPtr<SharedRendererState> ui_thread_weak_ptr_;
 
   // Accessed by both UI and RT thread.
   mutable base::Lock lock_;
   content::SynchronousCompositor* compositor_;
   content::SynchronousCompositorMemoryPolicy memory_policy_;
   // Set to true when SetMemoryPolicy called with a different memory policy.
   // Set to false when memory policy is read and enforced to compositor.
   bool memory_policy_dirty_;
-  DrawGLInput draw_gl_input_;
+  scoped_ptr<DrawGLInput> draw_gl_input_;
   std::queue<base::Closure> closure_queue_;
   bool hardware_initialized_;
+  gpu::GLInProcessContext* share_context_;
+  cc::ReturnedResourceArray returned_resources_;
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_SHARED_RENDERER_STATE_H_