Propagate audible state from player to the containing tab

content/browser/android/audio_monitor_android.cc

Index: content/browser/android/audio_monitor_android.cc
diff --git a/content/browser/android/audio_monitor_android.cc b/content/browser/android/audio_monitor_android.cc
new file mode 100644
index 0000000000000000000000000000000000000000..a9ff36fd6085263bf06aede110c1a8f2fdd52159
--- /dev/null
+++ b/content/browser/android/audio_monitor_android.cc
@@ -0,0 +1,58 @@
+// Copyright (c) 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 "content/browser/android/audio_monitor_android.h"
+
+#include <climits>
+#include "content/public/browser/web_contents.h"
+
+namespace content {
+
+AudioMonitorAndroid::AudioMonitorAndroid(WebContents* web_contents)
+    : web_contents_(web_contents)
+    , is_audible_(false) {

[qinmin, 2015/02/03 20:33:24]

"," is normally in the previous line

[Tima Vaisburd, 2015/02/03 23:53:04]

Done.

+}
+
+AudioMonitorAndroid::~AudioMonitorAndroid() {
+}

[qinmin, 2015/02/03 20:33:24]

you can move "}" to previous line

[Tima Vaisburd, 2015/02/03 23:53:04]

Done.

+
+bool AudioMonitorAndroid::IsAudible() const {
+  return is_audible_;
+}
+
+void AudioMonitorAndroid::OnAudibleStateChanged(RenderFrameHost* rfh,
+                                                int player_id,
+                                                bool is_audible) {
+  players_[Key(rfh, player_id)] = is_audible;
+  UpdateStatusAndNotify();
+}
+
+void AudioMonitorAndroid::RemovePlayer(RenderFrameHost* rfh, int player_id) {
+  players_.erase(Key(rfh, player_id));
+  UpdateStatusAndNotify();
+}
+
+void AudioMonitorAndroid::RenderFrameDeleted(RenderFrameHost* rfh) {
+  StatusMap::iterator begin = players_.lower_bound(Key(rfh, 0));
+  StatusMap::iterator end = players_.upper_bound(Key(rfh, INT_MAX));
+  players_.erase(begin, end);
+  UpdateStatusAndNotify();
+}
+
+void AudioMonitorAndroid::UpdateStatusAndNotify() {
+  int is_audible = false;
+  for (const auto& player : players_) {
+    if (player.second) {
+      is_audible = true;
+      break; // at least one player is making noise
+    }
+  }
+
+  if (is_audible_ != is_audible) {
+    is_audible_ = is_audible;
+    web_contents_->NotifyNavigationStateChanged(INVALIDATE_TYPE_TAB);
+  }
+}
+
+} // namespace content