Add support for swapping feeds in Android AppRTCMobile.

webrtc/examples/androidapp/AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
           package="org.appspot.apprtc"
           android:versionCode="1"
           android:versionName="1.0">
 
     <uses-feature android:name="android.hardware.camera" />
     <uses-feature android:name="android.hardware.camera.autofocus" />
     <uses-feature android:glEsVersion="0x00020000" android:required="true" />
     <uses-sdk android:minSdkVersion="16" android:targetSdkVersion="21" />
 
     <uses-permission android:name="android.permission.CAMERA" />
     <uses-permission android:name="android.permission.CHANGE_NETWORK_STATE" />
     <uses-permission android:name="android.permission.MODIFY_AUDIO_SETTINGS" />
     <uses-permission android:name="android.permission.RECORD_AUDIO" />
     <uses-permission android:name="android.permission.BLUETOOTH" />
     <uses-permission android:name="android.permission.INTERNET" />
     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
     <uses-permission android:name="android.permission.CAPTURE_VIDEO_OUTPUT" />
 
     <application android:label="@string/app_name"
                  android:icon="@drawable/ic_launcher"
                  android:allowBackup="false"
-                 android:debuggable="true">

[sakal, 2017/02/10 08:38:04]

linter complained about this. I don't think it is needed so I just removed it.

[sakal, 2017/02/10 12:21:20]

This was actually added recently so it is apparently needed for something. Let's
keep it.

[magjed_webrtc, 2017/02/10 13:23:38]

henrika@ wanted this in. We should probably keep it or talk to him about it.

+                 android:supportsRtl="false">

[sakal, 2017/02/10 08:38:04]

I don't think we support right-to-left locales? Linter wanted this to be
specified.

 
         <activity android:name="ConnectActivity"
                   android:label="@string/app_name"
                   android:windowSoftInputMode="adjustPan">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN"/>
                 <category android:name="android.intent.category.LAUNCHER"/>
             </intent-filter>
 
             <intent-filter>
@@ skipping 10 matching lines @@
         </activity>
 
         <activity android:name="CallActivity"
                   android:label="@string/app_name"
                   android:screenOrientation="fullUser"
                   android:configChanges="orientation|smallestScreenSize|screenSize|screenLayout"
                   android:theme="@style/CallActivityTheme">
         </activity>
     </application>
 </manifest>