Add a new command buffer function glScheduleCALayerInUseQueryCHROMIUM.

gpu/ipc/service/image_transport_surface_overlay_mac.h

Index: gpu/ipc/service/image_transport_surface_overlay_mac.h
diff --git a/gpu/ipc/service/image_transport_surface_overlay_mac.h b/gpu/ipc/service/image_transport_surface_overlay_mac.h
index 75264cb179b260863170654b71de4aae1e3733d9..d5c34d4787eda03d0cfa6c7c739762bff9f6c599 100644
--- a/gpu/ipc/service/image_transport_surface_overlay_mac.h
+++ b/gpu/ipc/service/image_transport_surface_overlay_mac.h
@@ -66,6 +66,8 @@ class ImageTransportSurfaceOverlayMac : public gl::GLSurface,
                        const gfx::Transform& transform,
                        int sorting_context_id,
                        unsigned filter) override;
+  void ScheduleCALayerInUseQuery(
+      std::vector<CALayerInUseQuery> queries) override;
   bool IsSurfaceless() const override;
 
   // ui::GpuSwitchingObserver implementation.
@@ -98,6 +100,21 @@ class ImageTransportSurfaceOverlayMac : public gl::GLSurface,
   gfx::Size pixel_size_;
   float scale_factor_;
 
+  struct IOSurfaceInUseQuery {
+    IOSurfaceInUseQuery();
+    explicit IOSurfaceInUseQuery(const IOSurfaceInUseQuery&);
+    explicit IOSurfaceInUseQuery(IOSurfaceInUseQuery&&);
+    ~IOSurfaceInUseQuery();
+
+    // It's possible that the client will have destroyed the texture before
+    // SwapBuffersInternal is called. It's important that |texture| is only used
+    // as an opaque identifier, since it may no longer point to the same
+    // texture.
+    unsigned texture = 0;
+    base::ScopedCFTypeRef<IOSurfaceRef> io_surface;
+  };
+  std::vector<IOSurfaceInUseQuery> io_surface_in_use_queries_;
+
   // A GLFence marking the end of the previous frame. Must only be accessed
   // while in a ScopedSetGLToRealGLApi, and while the associated
   // |previous_frame_context_| is bound.