Adding key press detection in the browser process.

media/audio/audio_input_controller.cc

Index: media/audio/audio_input_controller.cc
diff --git a/media/audio/audio_input_controller.cc b/media/audio/audio_input_controller.cc
index 31e137e2b17e4442c00979e85cbcffa31cd53cba..f7747b9d37fb77b948b34e0daf2e3a8407905f56 100644
--- a/media/audio/audio_input_controller.cc
+++ b/media/audio/audio_input_controller.cc
@@ -36,14 +36,17 @@ namespace media {
 AudioInputController::Factory* AudioInputController::factory_ = NULL;
 
 AudioInputController::AudioInputController(EventHandler* handler,
-                                           SyncWriter* sync_writer)
+                                           SyncWriter* sync_writer,
+                                           UserInputMonitor* user_input_monitor)
     : creator_loop_(base::MessageLoopProxy::current()),
       handler_(handler),
       stream_(NULL),
       data_is_active_(false),
       state_(kEmpty),
       sync_writer_(sync_writer),
-      max_volume_(0.0) {
+      max_volume_(0.0),
+      user_input_monitor_(user_input_monitor),
+      key_pressed_(false) {
   DCHECK(creator_loop_.get());
 }
 
@@ -56,17 +59,19 @@ scoped_refptr<AudioInputController> AudioInputController::Create(
     AudioManager* audio_manager,
     EventHandler* event_handler,
     const AudioParameters& params,
-    const std::string& device_id) {
+    const std::string& device_id,
+    UserInputMonitor* user_input_monitor) {
   DCHECK(audio_manager);
 
   if (!params.IsValid() || (params.channels() > kMaxInputChannels))
     return NULL;
 
-  if (factory_)
-    return factory_->Create(audio_manager, event_handler, params);
-
-  scoped_refptr<AudioInputController> controller(new AudioInputController(
-      event_handler, NULL));
+  if (factory_) {
+    return factory_->Create(
+        audio_manager, event_handler, params, user_input_monitor);
+  }
+  scoped_refptr<AudioInputController> controller(
+      new AudioInputController(event_handler, NULL, user_input_monitor));
 
   controller->message_loop_ = audio_manager->GetMessageLoop();
 
@@ -87,7 +92,8 @@ scoped_refptr<AudioInputController> AudioInputController::CreateLowLatency(
     EventHandler* event_handler,
     const AudioParameters& params,
     const std::string& device_id,
-    SyncWriter* sync_writer) {
+    SyncWriter* sync_writer,
+    UserInputMonitor* user_input_monitor) {
   DCHECK(audio_manager);
   DCHECK(sync_writer);
 
@@ -96,8 +102,8 @@ scoped_refptr<AudioInputController> AudioInputController::CreateLowLatency(
 
   // Create the AudioInputController object and ensure that it runs on
   // the audio-manager thread.
-  scoped_refptr<AudioInputController> controller(new AudioInputController(
-      event_handler, sync_writer));
+  scoped_refptr<AudioInputController> controller(
+      new AudioInputController(event_handler, sync_writer, user_input_monitor));
   controller->message_loop_ = audio_manager->GetMessageLoop();
 
   // Create and open a new audio input stream from the existing
@@ -116,14 +122,15 @@ scoped_refptr<AudioInputController> AudioInputController::CreateForStream(
     const scoped_refptr<base::MessageLoopProxy>& message_loop,
     EventHandler* event_handler,
     AudioInputStream* stream,
-    SyncWriter* sync_writer) {
+    SyncWriter* sync_writer,
+    UserInputMonitor* user_input_monitor) {
   DCHECK(sync_writer);
   DCHECK(stream);
 
   // Create the AudioInputController object and ensure that it runs on
   // the audio-manager thread.
-  scoped_refptr<AudioInputController> controller(new AudioInputController(
-      event_handler, sync_writer));
+  scoped_refptr<AudioInputController> controller(
+      new AudioInputController(event_handler, sync_writer, user_input_monitor));
   controller->message_loop_ = message_loop;
 
   // TODO(miu): See TODO at top of file.  Until that's resolved, we need to
@@ -233,6 +240,9 @@ void AudioInputController::DoRecord() {
 
   stream_->Start(this);
   handler_->OnRecording(this);
+
+  if (user_input_monitor_)
+    user_input_monitor_->AddKeyStrokeListener(this);
 }
 
 void AudioInputController::DoClose() {
@@ -251,6 +261,9 @@ void AudioInputController::DoClose() {
     }
 
     state_ = kClosed;
+
+    if (user_input_monitor_)
+      user_input_monitor_->RemoveKeyStrokeListener(this);
   }
 }
 
@@ -320,10 +333,13 @@ void AudioInputController::DoCheckForNoData() {
 void AudioInputController::OnData(AudioInputStream* stream, const uint8* data,
                                   uint32 size, uint32 hardware_delay_bytes,
                                   double volume) {
+  bool key_pressed = false;
   {
     base::AutoLock auto_lock(lock_);
     if (state_ != kRecording)
       return;
+
+    std::swap(key_pressed, key_pressed_);
   }
 
   // Mark data as active to ensure that the periodic calls to
@@ -332,7 +348,7 @@ void AudioInputController::OnData(AudioInputStream* stream, const uint8* data,
 
   // Use SyncSocket if we are in a low-latency mode.
   if (LowLatencyMode()) {
-    sync_writer_->Write(data, size, volume);
+    sync_writer_->Write(data, size, volume, key_pressed);
     sync_writer_->UpdateRecordedBytes(hardware_delay_bytes);
     return;
   }
@@ -353,8 +369,13 @@ void AudioInputController::OnError(AudioInputStream* stream) {
       &AudioInputController::DoReportError, this));
 }
 
+void AudioInputController::OnKeyStroke() {
+  base::AutoLock auto_lock(lock_);
+  key_pressed_ = true;
+}
+
 void AudioInputController::DoStopCloseAndClearStream(
-    base::WaitableEvent *done) {
+    base::WaitableEvent* done) {
   DCHECK(message_loop_->BelongsToCurrentThread());
 
   // Allow calling unconditionally and bail if we don't have a stream to close.