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

gpu/ipc/common/gpu_command_buffer_traits.h

Index: gpu/ipc/common/gpu_command_buffer_traits.h
diff --git a/gpu/ipc/common/gpu_command_buffer_traits.h b/gpu/ipc/common/gpu_command_buffer_traits.h
index 11209470f71268bf6cd9f5141477f1a5d0929532..b88ad3c2b43dd4bd1535246c3fbd4cf227348192 100644
--- a/gpu/ipc/common/gpu_command_buffer_traits.h
+++ b/gpu/ipc/common/gpu_command_buffer_traits.h
@@ -16,6 +16,7 @@ namespace gpu {
 struct Mailbox;
 struct MailboxHolder;
 struct SyncToken;
+struct TextureInUseResponse;
 }
 
 namespace IPC {
@@ -42,6 +43,17 @@ struct GPU_EXPORT ParamTraits<gpu::SyncToken> {
   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;