WIP Handle AwContents needing multiple live functors.

android_webview/browser/browser_view_renderer.h

 // Copyright (c) 2013 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_BROWSER_VIEW_RENDERER_H_
 #define ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_
 
 #include <stddef.h>
 
 #include <map>
+#include <set>
 
 #include "android_webview/browser/compositor_frame_producer.h"
 #include "android_webview/browser/parent_compositor_draw_constraints.h"
 #include "base/callback.h"
 #include "base/cancelable_callback.h"
 #include "base/macros.h"
 #include "base/trace_event/trace_event.h"
 #include "content/public/browser/android/synchronous_compositor.h"
 #include "content/public/browser/android/synchronous_compositor_client.h"
 #include "third_party/skia/include/core/SkRefCnt.h"
@@ skipping 24 matching lines @@
       content::WebContents* web_contents);
 
   BrowserViewRenderer(
       BrowserViewRendererClient* client,
       const scoped_refptr<base::SingleThreadTaskRunner>& ui_task_runner);
 
   ~BrowserViewRenderer() override;
 
   void RegisterWithWebContents(content::WebContents* web_contents);
 
-  // The BrowserViewRenderer client is responsible for ensuring that the
-  // CompositorFrameConsumer has been set correctly via this method.
-  void SetCompositorFrameConsumer(
+  // The BrowserViewRenderer client is responsible for ensuring that
+  // the current compositor frame consumer has been set correctly via
+  // this method.  The consumer is added to the set of registered
+  // consumers if it is not already registered.
+  void SetCurrentCompositorFrameConsumer(
       CompositorFrameConsumer* compositor_frame_consumer);
 
   // Called before either OnDrawHardware or OnDrawSoftware to set the view
   // state of this frame. |scroll| is the view's current scroll offset.
   // |global_visible_rect| is the intersection of the view size and the window
   // in window coordinates.
   void PrepareToDraw(const gfx::Vector2d& scroll,
                      const gfx::Rect& global_visible_rect);
 
   // Main handlers for view drawing. A false return value indicates no new
@@ skipping 48 matching lines @@
                             const gfx::Vector2dF& max_scroll_offset_dip,
                             const gfx::SizeF& scrollable_size_dip,
                             float page_scale_factor,
                             float min_page_scale_factor,
                             float max_page_scale_factor) override;
   void DidOverscroll(const gfx::Vector2dF& accumulated_overscroll,
                      const gfx::Vector2dF& latest_overscroll_delta,
                      const gfx::Vector2dF& current_fling_velocity) override;
 
   // CompositorFrameProducer overrides
-  void OnParentDrawConstraintsUpdated() override;
-  void OnCompositorFrameConsumerWillDestroy() override;
+  void OnParentDrawConstraintsUpdated(
+      CompositorFrameConsumer* compositor_frame_consumer) override;
+  void RemoveCompositorFrameConsumer(
+      CompositorFrameConsumer* compositor_frame_consumer) override;
 
  private:
   void SetTotalRootLayerScrollOffset(const gfx::Vector2dF& new_value_dip);
   bool CanOnDraw();
   void UpdateCompositorIsActive();
   bool CompositeSW(SkCanvas* canvas);
   std::unique_ptr<base::trace_event::ConvertableToTraceFormat>
   RootLayerStateAsValue(const gfx::Vector2dF& total_scroll_offset_dip,
                         const gfx::SizeF& scrollable_size_dip);
 
   void ReturnUnusedResource(std::unique_ptr<ChildFrame> frame);
   void ReturnResourceFromParent(
       CompositorFrameConsumer* compositor_frame_consumer);
   void ReleaseHardware();
 
   gfx::Vector2d max_scroll_offset() const;
 
   void UpdateMemoryPolicy();
 
   uint32_t GetCompositorID(content::SynchronousCompositor* compositor);
   // For debug tracing or logging. Return the string representation of this
   // view renderer's state.
   std::string ToString() const;
 
   BrowserViewRendererClient* const client_;
   const scoped_refptr<base::SingleThreadTaskRunner> ui_task_runner_;
-  CompositorFrameConsumer* compositor_frame_consumer_;
+  CompositorFrameConsumer* current_compositor_frame_consumer_;
+  std::set<CompositorFrameConsumer*> compositor_frame_consumers_;
 
   // The current compositor that's owned by the current RVH.
   content::SynchronousCompositor* compositor_;
   // A map from compositor's per-WebView unique ID to the compositor's raw
   // pointer. A raw pointer here is fine because the entry will be erased when
   // a compositor is destroyed.
   std::map<size_t, content::SynchronousCompositor*> compositor_map_;
 
   bool is_paused_;
   bool view_visible_;
@@ skipping 33 matching lines @@
   uint32_t next_compositor_id_;
 
   ParentCompositorDrawConstraints external_draw_constraints_;
 
   DISALLOW_COPY_AND_ASSIGN(BrowserViewRenderer);
 };
 
 }  // namespace android_webview
 
 #endif  // ANDROID_WEBVIEW_BROWSER_BROWSER_VIEW_RENDERER_H_