Android: enable/disable WebRTC HW H264 with a flag.

content/renderer/media/webrtc/peer_connection_dependency_factory.cc

Index: content/renderer/media/webrtc/peer_connection_dependency_factory.cc
diff --git a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
index df31b7cdbf2fa37ce47435d0d500307e256c468f..f503eebadc43a48e943c7a61a8e4cd1a07221f98 100644
--- a/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
+++ b/content/renderer/media/webrtc/peer_connection_dependency_factory.cc
@@ -238,8 +238,11 @@ void PeerConnectionDependencyFactory::InitializeSignalingThread(
     if (!cmd_line->HasSwitch(switches::kDisableWebRtcHWDecoding))
       decoder_factory.reset(new RTCVideoDecoderFactory(gpu_factories));
 
-    if (!cmd_line->HasSwitch(switches::kDisableWebRtcHWEncoding))
+    if (!cmd_line->HasSwitch(switches::kDisableWebRtcHWEncoding) ||
+        !cmd_line->GetSwitchValueASCII(switches::kDisableWebRtcHWEncoding)
+             .empty()) {
       encoder_factory.reset(new RTCVideoEncoderFactory(gpu_factories));
+    }
   }
 
 #if defined(OS_ANDROID)