Turn on speakerphone by default for WebRTC on Android.

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

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=207876

[qinmin, 2013-06-20 20:52:55]

On 2013/06/20 20:50:31, wjia wrote:

hmm... is this desired behavior? what if user has ear pieces plugged in to the
device?

[wjia(left Chromium), 2013-06-20 20:56:02]

On 2013/06/20 20:52:55, qinmin wrote:
> On 2013/06/20 20:50:31, wjia wrote:
> 
> hmm... is this desired behavior? what if user has ear pieces plugged in to the
> device?

In that case, AudioManagerAndroid will receive a ACTION_HEADSET_PLUG intent and
it will set speakerphone to off.

[qinmin, 2013-06-20 21:01:05]

On 2013/06/20 20:56:02, wjia wrote:
> On 2013/06/20 20:52:55, qinmin wrote:
> > On 2013/06/20 20:50:31, wjia wrote:
> > 
> > hmm... is this desired behavior? what if user has ear pieces plugged in to
the
> > device?
> 
> In that case, AudioManagerAndroid will receive a ACTION_HEADSET_PLUG intent
and
> it will set speakerphone to off.

And what if the ear piece is already plugged?

[wjia(left Chromium), 2013-06-20 21:03:11]

On 2013/06/20 21:01:05, qinmin wrote:
> On 2013/06/20 20:56:02, wjia wrote:
> > On 2013/06/20 20:52:55, qinmin wrote:
> > > On 2013/06/20 20:50:31, wjia wrote:
> > > 
> > > hmm... is this desired behavior? what if user has ear pieces plugged in to
> the
> > > device?
> > 
> > In that case, AudioManagerAndroid will receive a ACTION_HEADSET_PLUG intent
> and
> > it will set speakerphone to off.
> 
> And what if the ear piece is already plugged?

I was talking about this case (the earpiece is already plugged). Same thing is
done. I have tested it.

[qinmin, 2013-06-20 21:18:39]

lgtm

[wjia(left Chromium), 2013-06-21 17:54:26]

Committed patchset #1 manually as r207876 (presubmit successful).