iOS render: Handle frame rotation in OpenGL

webrtc/sdk/BUILD.gn

 # Copyright 2016 The WebRTC project authors. All Rights Reserved.
 #
 # Use of this source code is governed by a BSD-style license
 # that can be found in the LICENSE file in the root of the source
 # tree. An additional intellectual property rights grant can be found
 # in the file PATENTS.  All contributing project authors may
 # be found in the AUTHORS file in the root of the source tree.
 
 import("../build/webrtc.gni")
 import("//build_overrides/webrtc.gni")
@@ skipping 138 matching lines @@
       "objc/Framework/Headers/WebRTC/RTCSessionDescription.h",
       "objc/Framework/Headers/WebRTC/RTCStatsReport.h",
       "objc/Framework/Headers/WebRTC/RTCVideoFrame.h",
       "objc/Framework/Headers/WebRTC/RTCVideoRenderer.h",
       "objc/Framework/Headers/WebRTC/RTCVideoSource.h",
       "objc/Framework/Headers/WebRTC/RTCVideoTrack.h",
     ]
 
     if (is_ios) {
       sources += [
-        "objc/Framework/Classes/RTCEAGLVideoView.m",
+        "objc/Framework/Classes/RTCEAGLVideoView.mm",
         "objc/Framework/Classes/RTCNativeNV12Shader.mm",
         "objc/Framework/Headers/WebRTC/RTCEAGLVideoView.h",
       ]
       libs = [
         "CoreGraphics.framework",
         "GLKit.framework",
         "OpenGLES.framework",
         "QuartzCore.framework",
       ]
     }
@@ skipping 25 matching lines @@
     libs += [ "AVFoundation.framework" ]
 
     deps = [
       ":rtc_sdk_common_objc",
       "../api:libjingle_peerconnection",
     ]
   }
 
   # TODO(tkchin): Add the rtc_sdk_framework_objc target.
 }