Pass responsibility for IOSurface-texture reuse to the gpu process.

cc/output/output_surface.h

Index: cc/output/output_surface.h
diff --git a/cc/output/output_surface.h b/cc/output/output_surface.h
index 6bc2d84723399ac5fe6aa2ba2c0d0a370dbfa5ce..f9ec618996692697dc9b556337f6dd222cffa068 100644
--- a/cc/output/output_surface.h
+++ b/cc/output/output_surface.h
@@ -17,6 +17,7 @@
 #include "cc/output/overlay_candidate_validator.h"
 #include "cc/output/software_output_device.h"
 #include "cc/output/vulkan_context_provider.h"
+#include "gpu/command_buffer/common/texture_in_use_response.h"
 
 namespace base { class SingleThreadTaskRunner; }
 
@@ -140,6 +141,12 @@ class CC_EXPORT OutputSurface : public base::trace_event::MemoryDumpProvider {
   virtual void SwapBuffers(CompositorFrame* frame) = 0;
   virtual void OnSwapBuffersComplete();
 
+  // Called by subclasses after receiving a response from the gpu process to a
+  // query about whether a given set of textures is still in use by the OS
+  // compositor.
+  void DidReceiveTextureInUseResponses(
+      const gpu::TextureInUseResponses& responses);
+
   bool HasClient() { return !!client_; }
 
   // Get the class capable of informing cc of hardware overlay capability.