AppRTCMobile: Use high resolution app icon on retina screens.

Finally, no more hurting your eyes when looking at the app icon on a
retina device.

BUG=None
TBR=magjed@webrtc.org

Review-Url: https://codereview.webrtc.org/3001693002
Cr-Commit-Position: refs/heads/master@{#19351}

webrtc/examples/BUILD.gn

@@ -325,6 +325,8 @@ if (is_ios || (is_mac && target_cpu != "x86")) {
         "objc/AppRTCMobile/ios/resources/ic_switch_video_black_24dp.png",
         "objc/AppRTCMobile/ios/resources/ic_switch_video_black_24dp@2x.png",
         "objc/AppRTCMobile/ios/resources/mozart.mp3",
+        "objc/Icon-120.png",
+        "objc/Icon-180.png",
         "objc/Icon.png",
       ]
       outputs = [

webrtc/examples/objc/AppRTCMobile/ios/Info.plist

@@ -17,6 +17,8 @@
       <key>CFBundleIconFiles</key>
       <array>
         <string>Icon.png</string>
+        <string>Icon-120.png</string>
+        <string>Icon-180.png</string>
       </array>
     </dict>
   </dict>