Implemented new fence syncs which replaces the old sync points.

gpu/command_buffer/service/fence_sync_manager.cc

+// Copyright (c) 2012 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 "gpu/command_buffer/service/fence_sync_manager.h"
+
+#include <stdint.h>
+
+#include "base/logging.h"
+
+namespace gpu {
+
+FenceSyncManager::FenceSyncManager() : fence_sync_release_(0) {}
+
+FenceSyncManager::~FenceSyncManager() {
+  // Release all fences on destruction.
+  ReleaseFenceSync(UINT32_MAX);
+}
+
+void FenceSyncManager::AddFenceSyncCallback(uint32_t max_order_number,
+                                            uint32_t release,
+                                            const base::Closure& callback) {
+  fence_callback_queue_.push(FenceSyncCallback(release, callback));
+}
+
+void FenceSyncManager::ReleaseFenceSync(uint32_t release) {
+  DCHECK(release > fence_sync_release_);
+  fence_sync_release_ = release;
+
+  while (!fence_callback_queue_.empty() &&
+         fence_callback_queue_.top().release_count <= release) {
+    fence_callback_queue_.top().callback_closure.Run();
+    fence_callback_queue_.pop();
+  }
+}
+
+FenceSyncManager::FenceSyncCallback::FenceSyncCallback(
+    uint32_t release,
+    const base::Closure& callback)
+    : release_count(release), callback_closure(callback) {}
+
+FenceSyncManager::FenceSyncCallback::~FenceSyncCallback() {}
+
+}  // namespace gpu