Surfaces: Allow parent to refer to child surfaces that don't exist yet.

cc/surfaces/surface_manager.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_MANAGER_H_
 #define CC_SURFACES_SURFACE_MANAGER_H_
 
 #include <stdint.h>
 
 #include <list>
@@ skipping 20 matching lines @@
 #include <iosfwd>
 #include <string>
 #endif
 
 namespace cc {
 class BeginFrameSource;
 class CompositorFrame;
 class Surface;
 class SurfaceFactoryClient;
 
+namespace test {
+class CompositorFrameSinkSupportTest;
+}
+
 class CC_SURFACES_EXPORT SurfaceManager {
  public:
   enum class LifetimeType {
     REFERENCES,
     SEQUENCES,
   };
 
   explicit SurfaceManager(LifetimeType lifetime_type = LifetimeType::SEQUENCES);
   ~SurfaceManager();
 
@@ skipping 103 matching lines @@
 
   scoped_refptr<SurfaceReferenceFactory> reference_factory() {
     return reference_factory_;
   }
 
   bool using_surface_references() const {
     return lifetime_type_ == LifetimeType::REFERENCES;
   }
 
  private:
+  friend class test::CompositorFrameSinkSupportTest;
   friend class SurfaceManagerRefTest;
 
   using SurfaceIdSet = std::unordered_set<SurfaceId, SurfaceIdHash>;
 
   void RecursivelyAttachBeginFrameSource(const FrameSinkId& frame_sink_id,
                                          BeginFrameSource* source);
   void RecursivelyDetachBeginFrameSource(const FrameSinkId& frame_sink_id,
                                          BeginFrameSource* source);
 
   // Returns true if |child namespace| is or has |search_frame_sink_id| as a
@@ skipping 103 matching lines @@
   std::unique_ptr<SurfaceDependencyTracker> dependency_tracker_;
 
   base::WeakPtrFactory<SurfaceManager> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(SurfaceManager);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_MANAGER_H_