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..c5603512b58df93945c8529551d84f218ee6b68e 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 GetNamespaceID() const override {
+  return gpu::kCommandBufferNamespace_InProcess;
+}
+
+uint64_t GetCommandBufferID() const override {
+  return 0;
+}
+
 }  // namespace gpu