Set default sampling rate to 44100 and query the native output sampling rate.

media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java

Index: media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java
===================================================================
--- media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java	(revision 194029)
+++ media/base/android/java/src/org/chromium/media/AudioManagerAndroid.java	(working copy)
@@ -18,6 +18,7 @@
 @JNINamespace("media")
 class AudioManagerAndroid {
     private static final String TAG = AudioManagerAndroid.class.getSimpleName();
+    private static final int DEFAULT_SAMPLING_RATE = 44100;
 
     private final AudioManager mAudioManager;
     private final Context mContext;
@@ -78,6 +79,17 @@
         mAudioManager.setSpeakerphoneOn(mOriginalSpeakerStatus);
     }
 
+    @CalledByNative
+    public int getNativeOutputSampleRate() {
+        if (android.os.Build.VERSION.SDK_INT >= android.os.Build.VERSION_CODES.JELLY_BEAN_MR1) {
+            String sampleRateString = mAudioManager.getProperty(
+                    AudioManager.PROPERTY_OUTPUT_SAMPLE_RATE);
+            return Integer.parseInt(sampleRateString);
+        } else {
+            return DEFAULT_SAMPLING_RATE;
+        }
+    }
+
     private void logDeviceInfo() {
         Log.i(TAG, "Manufacturer:" + Build.MANUFACTURER +
                   " Board: " + Build.BOARD + " Device: " + Build.DEVICE +