Implemented new fence syncs which replaces the old sync points.

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 27442cb3834f78d4e51ea8d1198a36339121a765..bd89db6aa309abdd1d5e9820b0e5b0779084700b 100644
--- a/components/mus/gles2/command_buffer_local.cc
+++ b/components/mus/gles2/command_buffer_local.cc
@@ -32,6 +32,7 @@ CommandBufferLocal::CommandBufferLocal(CommandBufferLocalClient* client,
     : widget_(widget),
       gpu_state_(gpu_state),
       client_(client),
+      next_fence_sync_release_(1),
       weak_factory_(this) {}
 
 CommandBufferLocal::~CommandBufferLocal() {
@@ -220,6 +221,18 @@ uint64_t CommandBufferLocal::GetCommandBufferID() const {
   return 0;
 }
 
+uint32_t CommandBufferLocal::GenerateFenceSyncRelease() {
+  return next_fence_sync_release_++;
+}
+
+bool CommandBufferLocal::IsFenceSyncRelease(uint32_t release) {
+  return release > 0 && release < next_fence_sync_release_;
+}
+
+bool CommandBufferLocal::IsFenceSyncFlushed(uint32_t release) {
+  return IsFenceSyncRelease(release);
+}
+
 void CommandBufferLocal::PumpCommands() {
   if (!decoder_->MakeCurrent()) {
     command_buffer_->SetContextLostReason(decoder_->GetContextLostReason());