Add SurfaceFactory::Reset

cc/surfaces/surface_factory.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 CC_SURFACES_SURFACE_FACTORY_H_
 #define CC_SURFACES_SURFACE_FACTORY_H_
 
 #include <memory>
 #include <set>
 #include <unordered_map>
@@ skipping 17 matching lines @@
 class CopyOutputRequest;
 class Surface;
 class SurfaceFactoryClient;
 class SurfaceManager;
 
 // A SurfaceFactory is used to create surfaces that may share resources and
 // receive returned resources for frames submitted to those surfaces. Resources
 // submitted to frames created by a particular factory will be returned to that
 // factory's client when they are no longer being used. This is the only class
 // most users of surfaces will need to directly interact with.
-class CC_SURFACES_EXPORT SurfaceFactory
-    : public base::SupportsWeakPtr<SurfaceFactory> {
+class CC_SURFACES_EXPORT SurfaceFactory {
  public:
   using DrawCallback = base::Callback<void()>;
 
   SurfaceFactory(const FrameSinkId& frame_sink_id,
                  SurfaceManager* manager,
                  SurfaceFactoryClient* client);
   ~SurfaceFactory();
 
   const FrameSinkId& frame_sink_id() const { return frame_sink_id_; }
 
   void Create(const LocalFrameId& local_frame_id);
   void Destroy(const LocalFrameId& local_frame_id);
+
+  // Destroys all surfaces.
   void DestroyAll();
 
+  // Destroys and disown all surfaces, and reset all resource references. This
+  // is useful when resources are invalid (e.g. lost context).
+  void Reset();
+
   // Set that the current frame on new_id is to be treated as the successor to
   // the current frame on old_id for the purposes of calculating damage.
   void SetPreviousFrameSurface(const LocalFrameId& new_id,
                                const LocalFrameId& old_id);
 
   // A frame can only be submitted to a surface created by this factory,
   // although the frame may reference surfaces created by other factories.
   // The callback is called the first time this frame is used to draw, or if
   // the frame is discarded.
   void SubmitCompositorFrame(const LocalFrameId& local_frame_id,
@@ skipping 27 matching lines @@
   SurfaceManager* manager_;
   SurfaceFactoryClient* client_;
   SurfaceResourceHolder holder_;
 
   bool needs_sync_points_;
 
   using OwningSurfaceMap = std::
       unordered_map<LocalFrameId, std::unique_ptr<Surface>, LocalFrameIdHash>;
   OwningSurfaceMap surface_map_;
 
+  base::WeakPtrFactory<SurfaceFactory> weak_factory_;
+
   DISALLOW_COPY_AND_ASSIGN(SurfaceFactory);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_FACTORY_H_