Reland: Added SyncToken command buffer trait to help with IPC messages

gpu/ipc/gpu_command_buffer_traits.cc

Index: gpu/ipc/gpu_command_buffer_traits.cc
diff --git a/gpu/ipc/gpu_command_buffer_traits.cc b/gpu/ipc/gpu_command_buffer_traits.cc
index ed43cd29d57dd8cee214057921d25b3bb426af61..6a77984f8e44c5ab8327143a749f31857d716cf3 100644
--- a/gpu/ipc/gpu_command_buffer_traits.cc
+++ b/gpu/ipc/gpu_command_buffer_traits.cc
@@ -5,6 +5,7 @@
 #include "gpu/ipc/gpu_command_buffer_traits.h"
 
 #include "gpu/command_buffer/common/mailbox_holder.h"
+#include "gpu/command_buffer/common/sync_token.h"
 #include "gpu/command_buffer/common/value_state.h"
 
 // Generate param traits write methods.
@@ -55,6 +56,44 @@ void ParamTraits<gpu::CommandBuffer::State> ::Log(const param_type& p,
   l->append("<CommandBuffer::State>");
 }
 
+void ParamTraits<gpu::SyncToken>::Write(Message* m, const param_type& p) {
+  const int namespace_id = static_cast<int>(p.namespace_id());
+  const uint64_t command_buffer_id = p.command_buffer_id();
+  const uint64_t release_count = p.release_count();
+
+  m->WriteBytes(&namespace_id, sizeof(namespace_id));
+  m->WriteBytes(&command_buffer_id, sizeof(command_buffer_id));
+  m->WriteBytes(&release_count, sizeof(release_count));
+}
+
+bool ParamTraits<gpu::SyncToken>::Read(const Message* m,
+                                       base::PickleIterator* iter,
+                                       param_type* p) {
+  int namespace_id = -1;
+  if (!iter->ReadInt(&namespace_id))
+    return false;
+
+  uint64_t command_buffer_id = 0;
+  if (!iter->ReadUInt64(&command_buffer_id))
+    return false;
+
+  uint64_t release_count = 0;
+  if (!iter->ReadUInt64(&release_count))
+    return false;
+
+  p->Set(static_cast<gpu::CommandBufferNamespace>(namespace_id),
+         command_buffer_id,
+         release_count);
+  return true;
+}
+
+void ParamTraits<gpu::SyncToken>::Log(const param_type& p, std::string* l) {
+  *l +=
+      base::StringPrintf("[%d:%llX] %llu", static_cast<int>(p.namespace_id()),
+                         static_cast<unsigned long long>(p.command_buffer_id()),
+                         static_cast<unsigned long long>(p.release_count()));
+}
+
 void ParamTraits<gpu::Mailbox>::Write(Message* m, const param_type& p) {
   m->WriteBytes(p.name, sizeof(p.name));
 }