gpu: Add GpuFence framework.

gpu/ipc/in_process_command_buffer.cc

Index: gpu/ipc/in_process_command_buffer.cc
diff --git a/gpu/ipc/in_process_command_buffer.cc b/gpu/ipc/in_process_command_buffer.cc
index 54c0f0d3ebd463c6fcb5afd59fe04afc3ebac11a..b926d37e5776d1cece6e035f71ee6fe79b2d44ff 100644
--- a/gpu/ipc/in_process_command_buffer.cc
+++ b/gpu/ipc/in_process_command_buffer.cc
@@ -974,6 +974,15 @@ bool InProcessCommandBuffer::CanWaitUnverifiedSyncToken(
   return sync_token->namespace_id() == GetNamespaceID();
 }
 
+int32_t InProcessCommandBuffer::CreateFence(ClientFence fence) {
+  NOTIMPLEMENTED();
+  return -1;
+}
+
+void InProcessCommandBuffer::DestroyFence(int32_t id) {
+  NOTIMPLEMENTED();
+}
+
 gpu::error::Error InProcessCommandBuffer::GetLastError() {
   CheckSequencedThread();
   return last_state_.error;