Make MediaSession a runtime-enabled feature on Desktop.

content/browser/media/session/mock_media_session_observer.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 "content/browser/media/session/mock_media_session_observer.h"
+
+#include "testing/gtest/include/gtest/gtest.h"
+
+namespace content {
+
+MockMediaSessionObserver::MockMediaSessionObserver() = default;
+
+MockMediaSessionObserver::~MockMediaSessionObserver() = default;
+
+void MockMediaSessionObserver::OnSuspend(int player_id) {
+  EXPECT_GE(player_id, 0);
+  EXPECT_GT(players_.size(), static_cast<size_t>(player_id));
+
+  ++received_suspend_calls_;
+  players_[player_id].is_playing_ = false;
+}
+
+void MockMediaSessionObserver::OnResume(int player_id) {
+  EXPECT_GE(player_id, 0);
+  EXPECT_GT(players_.size(), static_cast<size_t>(player_id));
+
+  ++received_resume_calls_;
+  players_[player_id].is_playing_ = true;
+}
+
+void MockMediaSessionObserver::OnSetVolumeMultiplier(
+    int player_id, double volume_multiplier) {
+  EXPECT_GE(player_id, 0);
+  EXPECT_GT(players_.size(), static_cast<size_t>(player_id));
+
+  EXPECT_GE(volume_multiplier, 0.0f);
+  EXPECT_LE(volume_multiplier, 1.0f);
+
+  players_[player_id].volume_multiplier_ = volume_multiplier;
+}
+
+int MockMediaSessionObserver::StartNewPlayer() {
+  players_.push_back(MockPlayer(true, 1.0f));
+  return players_.size() - 1;
+}
+
+bool MockMediaSessionObserver::IsPlaying(size_t player_id) {
+  EXPECT_GT(players_.size(), player_id);
+  return players_[player_id].is_playing_;
+}
+
+double MockMediaSessionObserver::GetVolumeMultiplier(size_t player_id) {
+  EXPECT_GT(players_.size(), player_id);
+  return players_[player_id].volume_multiplier_;
+}
+
+void MockMediaSessionObserver::SetPlaying(size_t player_id, bool playing) {
+  EXPECT_GT(players_.size(), player_id);
+  players_[player_id].is_playing_ = playing;
+}
+
+int MockMediaSessionObserver::received_suspend_calls() const {
+  return received_suspend_calls_;
+}
+
+int MockMediaSessionObserver::received_resume_calls() const {
+  return received_resume_calls_;
+}
+
+}  // namespace content