Added a unique command buffer ID for command buffers.

gpu/command_buffer/service/in_process_command_buffer.cc

Index: gpu/command_buffer/service/in_process_command_buffer.cc
diff --git a/gpu/command_buffer/service/in_process_command_buffer.cc b/gpu/command_buffer/service/in_process_command_buffer.cc
index 6997cecdbf2de82fd668b4f7155050e5790e0727..37b60c72e9a9daed8f43f4ffbfb88e7357b86ebe 100644
--- a/gpu/command_buffer/service/in_process_command_buffer.cc
+++ b/gpu/command_buffer/service/in_process_command_buffer.cc
@@ -54,6 +54,8 @@ namespace gpu {
 
 namespace {
 
+base::StaticAtomicSequenceNumber g_next_command_buffer_id;
+
 template <typename T>
 static void RunTaskWithResult(base::Callback<T(void)> task,
                               T* result,
@@ -174,7 +176,9 @@ gpu::gles2::ProgramCache* InProcessCommandBuffer::Service::program_cache() {
 
 InProcessCommandBuffer::InProcessCommandBuffer(
     const scoped_refptr<Service>& service)
-    : context_lost_(false),
+    : CommandBuffer(kCommandBufferNamespace_InProcess,
+                    g_next_command_buffer_id.GetNext()),
+      context_lost_(false),
       idle_work_pending_(false),
       image_factory_(nullptr),
       last_put_offset_(-1),
@@ -289,7 +293,9 @@ bool InProcessCommandBuffer::InitializeOnGpuThread(
   manager->Initialize();
 
   scoped_ptr<CommandBufferService> command_buffer(
-      new CommandBufferService(transfer_buffer_manager_.get()));
+      new CommandBufferService(transfer_buffer_manager_.get(),
+                               namespace_id(),
+                               command_buffer_id()));
   command_buffer->SetPutOffsetChangeCallback(base::Bind(
       &InProcessCommandBuffer::PumpCommands, gpu_thread_weak_ptr_));
   command_buffer->SetParseErrorCallback(base::Bind(