Only allow webrtc HW offload for H264 encode for extension process.

content/renderer/media/rtc_video_encoder_factory.cc

Index: content/renderer/media/rtc_video_encoder_factory.cc
diff --git a/content/renderer/media/rtc_video_encoder_factory.cc b/content/renderer/media/rtc_video_encoder_factory.cc
index b21792204877947f0ac89cbb01098781239c62e9..ec92f5572f9bd7c1877985cd1e1f3f073186e7f0 100644
--- a/content/renderer/media/rtc_video_encoder_factory.cc
+++ b/content/renderer/media/rtc_video_encoder_factory.cc
@@ -4,7 +4,9 @@
 
 #include "content/renderer/media/rtc_video_encoder_factory.h"
 
+#include "base/command_line.h"
 #include "content/common/gpu/client/gpu_video_encode_accelerator_host.h"
+#include "content/public/common/content_switches.h"
 #include "content/renderer/media/rtc_video_encoder.h"
 #include "media/filters/gpu_video_accelerator_factories.h"
 #include "media/video/video_encode_accelerator.h"
@@ -23,16 +25,22 @@ void VEAToWebRTCCodecs(
   int fps = profile.max_framerate.numerator;
   DCHECK_EQ(profile.max_framerate.denominator, 1U);
 
+  const base::CommandLine* cmd_line = base::CommandLine::ForCurrentProcess();
   if (profile.profile >= media::VP8PROFILE_MIN &&
       profile.profile <= media::VP8PROFILE_MAX) {
-    codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
-        webrtc::kVideoCodecVP8, "VP8", width, height, fps));
+    if (cmd_line->HasSwitch(switches::kEnableWebRtcHWVp8Encoding)) {
+      codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
+          webrtc::kVideoCodecVP8, "VP8", width, height, fps));
+    }
   } else if (profile.profile >= media::H264PROFILE_MIN &&
              profile.profile <= media::H264PROFILE_MAX) {
+    if (cmd_line->HasSwitch(switches::kEnableWebRtcHWH264Encoding)) {
+      codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
+          webrtc::kVideoCodecH264, "H264", width, height, fps));
+    }
+    // TODO(hshi): remove the generic codec type after CASTv1 deprecation.
     codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
         webrtc::kVideoCodecGeneric, "CAST1", width, height, fps));
-    codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
-        webrtc::kVideoCodecH264, "H264", width, height, fps));
   }
 }