cc: Add SwapPromiseManager and SurfaceSequenceGenerator.

cc/trees/swap_promise_manager.cc

+// Copyright 2016 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 "cc/trees/swap_promise_manager.h"
+
+#include "cc/output/swap_promise.h"
+#include "cc/trees/swap_promise_monitor.h"
+
+namespace cc {
+
+SwapPromiseManager::SwapPromiseManager() {}
+
+SwapPromiseManager::~SwapPromiseManager() {
+  DCHECK(swap_promise_monitors_.empty());
+  BreakSwapPromises(SwapPromise::COMMIT_FAILS);
+}
+
+void SwapPromiseManager::QueueSwapPromise(
+    std::unique_ptr<SwapPromise> swap_promise) {
+  DCHECK(swap_promise);
+  swap_promise_list_.push_back(std::move(swap_promise));
+}
+
+void SwapPromiseManager::InsertSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
+  swap_promise_monitors_.insert(monitor);
+}
+
+void SwapPromiseManager::RemoveSwapPromiseMonitor(SwapPromiseMonitor* monitor) {
+  swap_promise_monitors_.erase(monitor);
+}
+
+void SwapPromiseManager::NotifySwapPromiseMonitorsOfSetNeedsCommit() {
+  for (auto* swap_promise_monitor : swap_promise_monitors_) {
+    swap_promise_monitor->OnSetNeedsCommitOnMain();
+  }
+}
+
+void SwapPromiseManager::WillCommit() {
+  for (const auto& swap_promise : swap_promise_list_)
+    swap_promise->OnCommit();
+}
+
+std::vector<std::unique_ptr<SwapPromise>>
+SwapPromiseManager::TakeSwapPromises() {
+  std::vector<std::unique_ptr<SwapPromise>> result;
+  result.swap(swap_promise_list_);
+  return result;
+}
+
+void SwapPromiseManager::BreakSwapPromises(
+    SwapPromise::DidNotSwapReason reason) {
+  for (const auto& swap_promise : swap_promise_list_)
+    swap_promise->DidNotSwap(reason);
+  swap_promise_list_.clear();
+}
+
+}  // namespace cc