Implemented new fence syncs which replaces the old sync points.

components/mus/gles2/command_buffer_local.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "components/mus/gles2/command_buffer_local.h"
 
 #include "base/bind.h"
 #include "components/mus/gles2/command_buffer_local_client.h"
 #include "components/mus/gles2/gpu_memory_tracker.h"
 #include "components/mus/gles2/mojo_gpu_memory_buffer.h"
@@ skipping 14 matching lines @@
 namespace mus {
 
 const unsigned int GL_MAP_CHROMIUM = 0x78F1;
 
 CommandBufferLocal::CommandBufferLocal(CommandBufferLocalClient* client,
                                        gfx::AcceleratedWidget widget,
                                        const scoped_refptr<GpuState>& gpu_state)
     : widget_(widget),
       gpu_state_(gpu_state),
       client_(client),
+      next_fence_sync_release_(1),
       weak_factory_(this) {}
 
 CommandBufferLocal::~CommandBufferLocal() {
   command_buffer_.reset();
   if (decoder_.get()) {
     bool have_context = decoder_->GetGLContext()->MakeCurrent(surface_.get());
     decoder_->Destroy(have_context);
     decoder_.reset();
   }
 }
@@ skipping 168 matching lines @@
 gpu::CommandBufferNamespace CommandBufferLocal::GetNamespaceID() const {
   NOTIMPLEMENTED();
   return gpu::CommandBufferNamespace::INVALID;
 }
 
 uint64_t CommandBufferLocal::GetCommandBufferID() const {
   NOTIMPLEMENTED();
   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());
     command_buffer_->SetParseError(::gpu::error::kLostContext);
     return;
   }
   scheduler_->PutChanged();
 }
 
 void CommandBufferLocal::OnResize(gfx::Size size, float scale_factor) {
@@ skipping 28 matching lines @@
 void CommandBufferLocal::OnContextLost(uint32_t reason) {
   if (client_)
     client_->DidLoseContext();
 }
 
 void CommandBufferLocal::OnSyncPointRetired() {
   scheduler_->SetScheduled(true);
 }
 
 }  // namespace mus