Allow the AudioLowLatencyInputOutput tests to run on bots where audio hardware is available.

media/audio/win/audio_low_latency_input_win_unittest.cc

 // Copyright (c) 2011 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 <windows.h>
 #include <mmsystem.h>
 
 #include "base/basictypes.h"
 #include "base/environment.h"
 #include "base/memory/scoped_ptr.h"
@@ skipping 71 matching lines @@
 
  private:
   media::SeekableBuffer buffer_;
   FILE* file_;
   size_t bytes_to_write_;
 };
 
 // Convenience method which ensures that we are not running on the build
 // bots and that at least one valid input device can be found.
 static bool CanRunAudioTests(AudioManager* audio_man) {
-  scoped_ptr<base::Environment> env(base::Environment::Create());
-  if (env->HasVar("CHROME_HEADLESS"))
-    return false;
-
   // TODO(henrika): note that we use Wave today to query the number of
   // existing input devices.
-  return audio_man->HasAudioInputDevices();
+  bool input = audio_man->HasAudioInputDevices();
+  LOG_IF(WARNING, !input) << "No input device detected.";
+  return input;
 }
 
 // Convenience method which creates a default AudioInputStream object but
 // also allows the user to modify the default settings.
 class AudioInputStreamWrapper {
  public:
   explicit AudioInputStreamWrapper(AudioManager* audio_manager)
       : com_init_(ScopedCOMInitializer::kMTA),
         audio_man_(audio_manager),
         format_(AudioParameters::AUDIO_PCM_LOW_LATENCY),
@@ skipping 257 matching lines @@
   fprintf(stderr, "               File name  : %s\n", file_name);
   fprintf(stderr, "               Sample rate: %d\n", aisw.sample_rate());
   WriteToFileAudioSink file_sink(file_name);
   fprintf(stderr, "               >> Speak into the mic while recording...\n");
   ais->Start(&file_sink);
   base::PlatformThread::Sleep(TestTimeouts::action_timeout_ms());
   ais->Stop();
   fprintf(stderr, "               >> Recording has stopped.\n");
   ais->Close();
 }