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 3d2ac952b8f3462c02ad99063885ee178a176700..fd000dbdb5f68f75583955a325cb41cc4b87faa1 100644
--- a/components/mus/gles2/command_buffer_local.cc
+++ b/components/mus/gles2/command_buffer_local.cc
@@ -212,6 +212,16 @@ 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());