add audio-buffer-size command line flag support to the input audio for all the platforms

media/audio/android/audio_manager_android.cc

Index: media/audio/android/audio_manager_android.cc
diff --git a/media/audio/android/audio_manager_android.cc b/media/audio/android/audio_manager_android.cc
index 48f203ab74e8bb1d3bc4ab395fc301757db3a7a6..8c600691fc5dc382b72ff5394e9d49505c669f91 100644
--- a/media/audio/android/audio_manager_android.cc
+++ b/media/audio/android/audio_manager_android.cc
@@ -116,8 +116,9 @@ void AudioManagerAndroid::GetAudioOutputDeviceNames(
   AddDefaultDevice(device_names);
 }
 
-AudioParameters AudioManagerAndroid::GetInputStreamParameters(
-    const std::string& device_id) {
+AudioParameters AudioManagerAndroid::GetPreferredInputStreamParameters(
+    const std::string& input_device_id,
+    const AudioParameters& input_params) {
   DCHECK(GetTaskRunner()->BelongsToCurrentThread());
 
   // Use mono as preferred number of input channels on Android to save
@@ -125,6 +126,8 @@ AudioParameters AudioManagerAndroid::GetInputStreamParameters(
   // Galaxy S3 and S4 devices. See http://crbug.com/256851 for details.
   JNIEnv* env = AttachCurrentThread();
   ChannelLayout channel_layout = CHANNEL_LAYOUT_MONO;
+  int sample_rate = GetNativeOutputSampleRate();
+  int bits_per_sample = 16;
   int buffer_size = Java_AudioManagerAndroid_getMinInputFrameSize(
       env, GetNativeOutputSampleRate(),
       ChannelLayoutToChannelCount(channel_layout));
@@ -133,14 +136,23 @@ AudioParameters AudioManagerAndroid::GetInputStreamParameters(
   effects |= Java_AudioManagerAndroid_shouldUseAcousticEchoCanceler(env) ?
       AudioParameters::ECHO_CANCELLER : AudioParameters::NO_EFFECTS;
 
+  if (input_params.IsValid()) {
+    // Use the client's input parameters if they are valid.
+    sample_rate = input_params.sample_rate();
+    bits_per_sample = input_params.bits_per_sample();
+    channel_layout = input_params.channel_layout();
+    buffer_size = GetOptimalOutputFrameSize(
+        sample_rate, ChannelLayoutToChannelCount(channel_layout));
+    effects |= input_params.effects();
+  }
+
   int user_buffer_size = GetUserBufferSize();
   if (user_buffer_size)
     buffer_size = user_buffer_size;
 
-  AudioParameters params(
+  return AudioParameters(
       AudioParameters::AUDIO_PCM_LOW_LATENCY, channel_layout, 0,
-      GetNativeOutputSampleRate(), 16, buffer_size, effects);
-  return params;
+      sample_rate, bits_per_sample, buffer_size, effects);
 }
 
 AudioOutputStream* AudioManagerAndroid::MakeAudioOutputStream(