Start of hardware overlay support in CC with Ubercompositor.

cc/output/output_surface.h

 // Copyright 2012 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_OUTPUT_OUTPUT_SURFACE_H_
 #define CC_OUTPUT_OUTPUT_SURFACE_H_
 
 #include <deque>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
 #include "cc/base/cc_export.h"
 #include "cc/base/rolling_time_delta_history.h"
 #include "cc/output/context_provider.h"
+#include "cc/output/overlay_candidate_validator.h"
 #include "cc/output/software_output_device.h"
 #include "cc/scheduler/frame_rate_controller.h"
 
 namespace base { class SingleThreadTaskRunner; }
 
 namespace ui { struct LatencyInfo; }
 
 namespace gfx {
 class Rect;
 class Size;
@@ skipping 105 matching lines @@
   // notification will be delivered by calling
   // OutputSurfaceClient::BeginImplFrame until the callback is disabled.
   virtual void SetNeedsBeginImplFrame(bool enable);
 
   bool HasClient() { return !!client_; }
 
   // Returns an estimate of the current GPU latency. When only a software
   // device is present, returns 0.
   base::TimeDelta GpuLatencyEstimate();
 
+  // Get the class capable of informing cc of hardware overlay capability.
+  OverlayCandidateValidator* overlay_candidate_validator() const {
+    return overlay_candidate_validator_.get();
+  }
+
  protected:
   // Synchronously initialize context3d and enter hardware mode.
   // This can only supported in threaded compositing mode.
   // |offscreen_context_provider| should match what is returned by
   // LayerTreeClient::OffscreenContextProvider().
   bool InitializeAndSetContext3d(
       scoped_refptr<ContextProvider> context_provider,
       scoped_refptr<ContextProvider> offscreen_context_provider);
   void ReleaseGL();
 
   void PostSwapBuffersComplete();
 
   struct OutputSurface::Capabilities capabilities_;
   scoped_refptr<ContextProvider> context_provider_;
   scoped_ptr<SoftwareOutputDevice> software_device_;
+  scoped_ptr<OverlayCandidateValidator> overlay_candidate_validator_;
   gfx::Size surface_size_;
   float device_scale_factor_;
 
   // The FrameRateController is deprecated.
   // Platforms should move to native BeginImplFrames instead.
   void CommitVSyncParameters(base::TimeTicks timebase,
                              base::TimeDelta interval);
   virtual void FrameRateControllerTick(bool throttled,
                                        const BeginFrameArgs& args) OVERRIDE;
   scoped_ptr<FrameRateController> frame_rate_controller_;
@@ skipping 44 matching lines @@
   std::deque<unsigned> available_gpu_latency_query_ids_;
   std::deque<unsigned> pending_gpu_latency_query_ids_;
   RollingTimeDeltaHistory gpu_latency_history_;
 
   DISALLOW_COPY_AND_ASSIGN(OutputSurface);
 };
 
 }  // namespace cc
 
 #endif  // CC_OUTPUT_OUTPUT_SURFACE_H_