[WebRTC] updated to upstream branch 49 and related.

this patch is based on 38d7a7883...226f2f0bd

dom/media/systemservices/moz.build

@@ -1,4 +1,4 @@
-# -*- Mode: python; indent-tabs-mode: nil; tab-width: 40 -*-
+# -*- Mode: python; c-basic-offset: 4; indent-tabs-mode: nil; tab-width: 40 -*-
 # This Source Code Form is subject to the terms of the Mozilla Public
 # License, v. 2.0. If a copy of the MPL was not distributed with this
 # file, You can obtain one at http://mozilla.org/MPL/2.0/.
@@ -10,6 +10,8 @@ if CONFIG['MOZ_WEBRTC']:
         'LoadManager.h',
         'LoadManagerFactory.h',
         'LoadMonitor.h',
+        'VideoEngine.h',
+        'VideoFrameUtils.h'
     ]
     SOURCES += [
         'CamerasChild.cpp',
@@ -18,6 +20,8 @@ if CONFIG['MOZ_WEBRTC']:
         'LoadManagerFactory.cpp',
         'LoadMonitor.cpp',
         'ShmemPool.cpp',
+        'VideoEngine.cpp',
+        'VideoFrameUtils.cpp'
     ]
     LOCAL_INCLUDES += [
         '/media/webrtc/signaling',
@@ -29,6 +33,9 @@ if CONFIG['OS_TARGET'] == 'WINNT':
 else:
     DEFINES['WEBRTC_POSIX'] = True
 
+if CONFIG['OS_TARGET'] == 'Android':
+    DEFINES['WEBRTC_ANDROID'] = True
+
 
 if CONFIG['OS_TARGET'] == 'Android':
     EXPORTS += [