Pass FROM_HERE to ObserverListThreadSafe::Notify to improve profile.

remoting/host/linux/audio_pipe_reader.cc

 // Copyright (c) 2012 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 "remoting/host/linux/audio_pipe_reader.h"
 
 #include <fcntl.h>
 #include <sys/stat.h>
 #include <sys/types.h>
 #include <unistd.h>
@@ skipping 175 matching lines @@
   // to read |bytes_to_read| bytes, but in case it's misbehaving we need to make
   // sure that |stream_position_bytes| doesn't go out of sync with the current
   // stream position.
   if (stream_position_bytes - last_capture_position_ > pipe_buffer_size_)
     last_capture_position_ = stream_position_bytes - pipe_buffer_size_;
   DCHECK_LE(last_capture_position_, stream_position_bytes);
 
   // Dispatch asynchronous notification to the stream observers.
   scoped_refptr<base::RefCountedString> data_ref =
       base::RefCountedString::TakeString(&data);
-  observers_->Notify(&StreamObserver::OnDataRead, data_ref);
+  observers_->Notify(FROM_HERE, &StreamObserver::OnDataRead, data_ref);
 }
 
 void AudioPipeReader::WaitForPipeReadable() {
   timer_.Stop();
   base::MessageLoopForIO::current()->WatchFileDescriptor(
       pipe_.GetPlatformFile(), false, base::MessageLoopForIO::WATCH_READ,
       &file_descriptor_watcher_, this);
 }
 
 // static
 void AudioPipeReaderTraits::Destruct(const AudioPipeReader* audio_pipe_reader) {
   audio_pipe_reader->task_runner_->DeleteSoon(FROM_HERE, audio_pipe_reader);
 }
 
 }  // namespace remoting