Added a unique command buffer ID for command buffers.

components/mus/gles2/command_buffer_local.cc

Index: components/mus/gles2/command_buffer_local.cc
diff --git a/components/mus/gles2/command_buffer_local.cc b/components/mus/gles2/command_buffer_local.cc
index f6e15a03a1263ea5153e34dc96c19a32e77848be..f9e073cf240dd145a6a2cbc2279bc43ce80613e6 100644
--- a/components/mus/gles2/command_buffer_local.cc
+++ b/components/mus/gles2/command_buffer_local.cc
@@ -210,6 +210,16 @@ bool CommandBufferLocal::IsGpuChannelLost() {
   return false;
 }
 
+gpu::CommandBufferNamespace CommandBufferLocal::GetNamespaceID() const {
+  NOTIMPLEMENTED();
+  return gpu::CommandBufferNamespace::INVALID;
+}
+
+uint64_t CommandBufferLocal::GetCommandBufferID() const {
+  NOTIMPLEMENTED();
+  return 0;
+}
+
 void CommandBufferLocal::PumpCommands() {
   if (!decoder_->MakeCurrent()) {
     command_buffer_->SetContextLostReason(decoder_->GetContextLostReason());