Enforce constant size and device scale factor for surfaces

cc/surfaces/surface.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_H_
 #define CC_SURFACES_SURFACE_H_
 
 #include <stddef.h>
 #include <stdint.h>
 
 #include <map>
 #include <memory>
 #include <set>
 #include <unordered_set>
 #include <vector>
 
 #include "base/callback.h"
 #include "base/macros.h"
 #include "base/memory/weak_ptr.h"
 #include "base/optional.h"
 #include "cc/output/copy_output_request.h"
 #include "cc/surfaces/compositor_frame_sink_support.h"
 #include "cc/surfaces/frame_sink_id.h"
-#include "cc/surfaces/surface_id.h"
+#include "cc/surfaces/surface_info.h"
 #include "cc/surfaces/surface_sequence.h"
 #include "cc/surfaces/surfaces_export.h"
 #include "ui/gfx/geometry/size.h"
 
 namespace ui {
 class LatencyInfo;
 }
 
 namespace cc {
 
 class CompositorFrame;
 class CopyOutputRequest;
 
 class CC_SURFACES_EXPORT Surface {
  public:
   using WillDrawCallback =
       base::RepeatingCallback<void(const LocalSurfaceId&, const gfx::Rect&)>;
 
   Surface(
-      const SurfaceId& id,
+      const SurfaceInfo& surface_info,
       base::WeakPtr<CompositorFrameSinkSupport> compositor_frame_sink_support);
   ~Surface();
 
-  const SurfaceId& surface_id() const { return surface_id_; }
+  const SurfaceId& surface_id() const { return surface_info_.id(); }
   const SurfaceId& previous_frame_surface_id() const {
     return previous_frame_surface_id_;
   }
 
   void SetPreviousFrameSurface(Surface* surface);
 
+  // Returns false if |frame| is invalid.
   // |draw_callback| is called once to notify the client that the previously
   // submitted CompositorFrame is processed and that another frame can be
   // submitted.
   // |will_draw_callback| is called when |surface| is scheduled for a draw and
   // there is visible damage.
-  void QueueFrame(CompositorFrame frame,
+  bool QueueFrame(CompositorFrame frame,
                   const base::Closure& draw_callback,
                   const WillDrawCallback& will_draw_callback);
   void RequestCopyOfOutput(std::unique_ptr<CopyOutputRequest> copy_request);
 
   // Notifies the Surface that a blocking SurfaceId now has an active frame.
   void NotifySurfaceIdAvailable(const SurfaceId& surface_id);
 
   // Called if a deadline has been hit and this surface is not yet active but
   // it's marked as respecting deadlines.
   void ActivatePendingFrameForDeadline();
@@ skipping 78 matching lines @@
   void UnrefFrameResourcesAndRunDrawCallback(
       base::Optional<FrameData> frame_data);
   void ClearCopyRequests();
 
   void TakeLatencyInfoFromPendingFrame(
       std::vector<ui::LatencyInfo>* latency_info);
   static void TakeLatencyInfoFromFrame(
       CompositorFrame* frame,
       std::vector<ui::LatencyInfo>* latency_info);
 
-  const SurfaceId surface_id_;
+  SurfaceInfo surface_info_;
   SurfaceId previous_frame_surface_id_;
   base::WeakPtr<CompositorFrameSinkSupport> compositor_frame_sink_support_;
   SurfaceManager* const surface_manager_;
 
   base::Optional<FrameData> pending_frame_data_;
   base::Optional<FrameData> active_frame_data_;
   int frame_index_;
   bool closed_ = false;
   bool destroyed_;
   std::vector<SurfaceSequence> destruction_dependencies_;
 
   base::flat_set<SurfaceId> blocking_surfaces_;
 
   DISALLOW_COPY_AND_ASSIGN(Surface);
 };
 
 }  // namespace cc
 
 #endif  // CC_SURFACES_SURFACE_H_