roll webrtc 6825-6898 and add some missing files to libjingle gyp

TBR=sergeyu@chromium.org

BUG=

Review URL: https://codereview.chromium.org/475683002

Cr-Commit-Position: refs/heads/master@{#289557}
git-svn-id: svn://svn.chromium.org/chrome/trunk/src@289557 0039d316-1c4b-4281-b951-d872f2087c98

DEPS

@@ -55,7 +55,7 @@ vars = {
   # Three lines of non-changing comments so that
   # the commit queue can handle CLs rolling WebRTC
   # and V8 without interference from each other.
-  "webrtc_revision": "6825",
+  "webrtc_revision": "6898",
   "jsoncpp_revision": "248",
   "nss_revision": "287121",
   # Three lines of non-changing comments so that

third_party/libjingle/README.chromium

 Name: libjingle
 URL: http://code.google.com/p/webrtc/
 Version: unknown
-Revision: 6825
+Revision: 6898
 License: BSD
 License File: source/talk/COPYING
 Security Critical: yes

third_party/libjingle/libjingle.gyp

@@ -588,6 +588,8 @@
             '<(libjingle_source)/talk/media/webrtc/webrtcmediaengine.cc',
             '<(libjingle_source)/talk/media/webrtc/webrtcmediaengine.h',
             '<(libjingle_source)/talk/media/webrtc/webrtcvideoengine.cc',
+            '<(libjingle_source)/talk/media/webrtc/webrtcvideoframefactory.cc',
+            '<(libjingle_source)/talk/media/webrtc/webrtcvideoframefactory.h',
             '<(libjingle_source)/talk/media/webrtc/webrtcvideoengine.h',
             '<(libjingle_source)/talk/media/webrtc/webrtcvideoengine2.cc',
             '<(libjingle_source)/talk/media/webrtc/webrtcvideoengine2.h',