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

gpu/ipc/common/gpu_command_buffer_traits.h

 // Copyright (c) 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 GPU_IPC_COMMON_GPU_COMMAND_BUFFER_TRAITS_H_
 #define GPU_IPC_COMMON_GPU_COMMAND_BUFFER_TRAITS_H_
 
 #include "gpu/command_buffer/common/command_buffer.h"
 #include "gpu/command_buffer/common/id_type.h"
 #include "gpu/gpu_export.h"
 #include "gpu/ipc/common/gpu_command_buffer_traits_multi.h"
 #include "ipc/ipc_message_utils.h"
 #include "ipc/ipc_param_traits.h"
 
 namespace gpu {
 struct Mailbox;
 struct MailboxHolder;
 struct SyncToken;
+struct TextureInUseResponse;
 }
 
 namespace IPC {
 
 template <>
 struct GPU_EXPORT ParamTraits<gpu::CommandBuffer::State> {
   using param_type = gpu::CommandBuffer::State;
   static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,
                    param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
 template <>
 struct GPU_EXPORT ParamTraits<gpu::SyncToken> {
   using param_type = gpu::SyncToken;
   static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,
                    param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
 
+template <>
+struct GPU_EXPORT ParamTraits<gpu::TextureInUseResponse> {

[piman, 2016/06/15 00:37:47]

nit: could this be a IPC_STRUCT_TRAITS in gpu_messages.h ?
(I'm not really sure why some of the others are not... maybe I'm missing
something, but I think it should work).

[erikchen, 2016/06/15 00:44:01]

I tried that at first.  gpu_messages.h is a multiply included file, which causes
problems when it gets included into another header file.

+  using param_type = gpu::TextureInUseResponse;
+  static void GetSize(base::PickleSizer* s, const param_type& p);
+  static void Write(base::Pickle* m, const param_type& p);
+  static bool Read(const base::Pickle* m,
+                   base::PickleIterator* iter,
+                   param_type* p);
+  static void Log(const param_type& p, std::string* l);
+};
+
 template<>
 struct GPU_EXPORT ParamTraits<gpu::Mailbox> {
   using param_type = gpu::Mailbox;
   static void GetSize(base::PickleSizer* s, const param_type& p);
   static void Write(base::Pickle* m, const param_type& p);
   static bool Read(const base::Pickle* m,
                    base::PickleIterator* iter,
                    param_type* p);
   static void Log(const param_type& p, std::string* l);
 };
@@ skipping 28 matching lines @@
     return true;
   }
   static void Log(const param_type& p, std::string* l) {
     LogParam(p.GetUnsafeValue(), l);
   }
 };
 
 }  // namespace IPC
 
 #endif  // GPU_IPC_COMMON_GPU_COMMAND_BUFFER_TRAITS_H_