Turn on speakerphone by default for WebRTC on Android.

This routes audio to speaker, instead of earpiece, by default for WebRTC on Android.

BUG=243506
TEST=run https://apprtc.appspot.com/?debug=loopback on Google Android devices. Audio will come out of speaker.
R=qinmin@chromium.org

Review URL: https://codereview.chromium.org/17491008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@207876 0039d316-1c4b-4281-b951-d872f2087c98

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

@@ -41,6 +41,9 @@ class AudioManagerAndroid {
     public void setMode(int mode) {
         try {
             mAudioManager.setMode(mode);
+            if (mode == AudioManager.MODE_IN_COMMUNICATION) {
+                mAudioManager.setSpeakerphoneOn(true);
+            }
         } catch (SecurityException e) {
             Log.e(TAG, "setMode exception: " + e.getMessage());
             logDeviceInfo();