Added a unique command buffer ID for command buffers.

gpu/command_buffer/tests/gl_manager.cc

Index: gpu/command_buffer/tests/gl_manager.cc
diff --git a/gpu/command_buffer/tests/gl_manager.cc b/gpu/command_buffer/tests/gl_manager.cc
index c5f70877703c8fb7d519bcd6eb18cf97274e0132..0dbbde59874ae627af71740b1f43ca0586d5099a 100644
--- a/gpu/command_buffer/tests/gl_manager.cc
+++ b/gpu/command_buffer/tests/gl_manager.cc
@@ -438,4 +438,12 @@ bool GLManager::IsGpuChannelLost() {
   return false;
 }
 
+gpu::CommandBufferNamespace GLManager::GetNamespaceID() const {
+  return gpu::kCommandBufferNamespace_InProcess;
+}
+
+uint64_t GLManager::GetCommandBufferID() const {
+  return 0;
+}
+
 }  // namespace gpu