Navigation transitions: Block first response until after transitions have run.

content/browser/transition_request_manager.cc

+// Copyright 2014 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 "content/browser/transition_request_manager.h"
+
+#include "base/memory/singleton.h"
+
+namespace content {
+
+bool TransitionRequestManager::HasPendingTransitionRequest(
+    int process_id,
+    int render_frame_id) {
+  base::AutoLock lock(lock_);
+
+  std::pair<int, int> key(process_id, render_frame_id);
+  return (pending_transition_frames_.find(key) !=
+          pending_transition_frames_.end());
+}
+
+void TransitionRequestManager::SetHasPendingTransitionRequest(
+    int process_id,
+    int render_frame_id,
+    bool has_pending) {
+  base::AutoLock lock(lock_);
+
+  std::pair<int, int> key(process_id, render_frame_id);
+  if (has_pending) {
+    pending_transition_frames_.insert(key);
+  } else {
+    pending_transition_frames_.erase(key);
+  }
+}
+
+TransitionRequestManager::TransitionRequestManager() {
+}
+
+TransitionRequestManager::~TransitionRequestManager() {
+}
+
+// static
+TransitionRequestManager* TransitionRequestManager::GetInstance() {
+  return Singleton<TransitionRequestManager>::get();
+}
+
+}  // namespace content