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

Add cmdline switch::kEnableWebRtcHWH264Encoding to control whether
to report WebRtc HW H264 encoding capability.

BUG=385941
R=xiyuan@chromium.org,kalman@chromium.org,posicak@chromium.org,jamesr@chromium.org
TBR=piman@chromium.org

Review URL: https://codereview.chromium.org/453063002

Cr-Commit-Position: refs/heads/master@{#292028}

chrome/browser/chromeos/login/chrome_restart_request.cc

@@ -151,6 +151,7 @@ std::string DeriveCommandLine(const GURL& start_url,
     ::switches::kDisableWebRtcHWDecoding,
     ::switches::kDisableWebRtcHWEncoding,
     ::switches::kEnableWebRtcHWVp8Encoding,
+    ::switches::kEnableWebRtcHWH264Encoding,
 #endif
     ::switches::kDisableVaapiAcceleratedVideoEncode,
 #if defined(USE_OZONE)

chrome/browser/extensions/chrome_content_browser_client_extensions_part.cc

@@ -29,6 +29,7 @@
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/site_instance.h"
 #include "content/public/browser/web_contents.h"
+#include "content/public/common/content_switches.h"
 #include "extensions/browser/extension_host.h"
 #include "extensions/browser/extension_message_filter.h"
 #include "extensions/browser/extension_registry.h"
@@ -526,8 +527,12 @@ void ChromeContentBrowserClientExtensionsPart::
   if (!process)
     return;
   DCHECK(profile);
-  if (ProcessMap::Get(profile)->Contains(process->GetID()))
+  if (ProcessMap::Get(profile)->Contains(process->GetID())) {
     command_line->AppendSwitch(switches::kExtensionProcess);
+#if defined(ENABLE_WEBRTC)
+    command_line->AppendSwitch(::switches::kEnableWebRtcHWH264Encoding);
+#endif
+  }
 }
 
 }  // namespace extensions

content/browser/renderer_host/render_process_host_impl.cc

@@ -1235,6 +1235,7 @@ void RenderProcessHostImpl::PropagateBrowserCommandLineToRenderer(
     switches::kDisableWebRtcHWDecoding,
     switches::kDisableWebRtcHWEncoding,
     switches::kEnableWebRtcHWVp8Encoding,
+    switches::kEnableWebRtcHWH264Encoding,
 #endif
     switches::kLowEndDeviceMode,
 #if defined(OS_ANDROID)

content/public/common/content_switches.cc

@@ -855,6 +855,9 @@ const char kDisableWebRtcHWEncoding[]       = "disable-webrtc-hw-encoding";
 
 // Enables VP8 HW encode acceleration for WebRTC.
 const char kEnableWebRtcHWVp8Encoding[]     = "enable-webrtc-hw-vp8-encoding";
+
+// Enables H264 HW encode acceleration for WebRTC.
+const char kEnableWebRtcHWH264Encoding[]    = "enable-webrtc-hw-h264-encoding";
 #endif
 
 #if defined(OS_ANDROID)

content/public/common/content_switches.h

@@ -242,6 +242,7 @@ CONTENT_EXPORT extern const char kDisableWebRtcHWDecoding[];
 CONTENT_EXPORT extern const char kDisableWebRtcEncryption[];
 CONTENT_EXPORT extern const char kDisableWebRtcHWEncoding[];
 CONTENT_EXPORT extern const char kEnableWebRtcHWVp8Encoding[];
+CONTENT_EXPORT extern const char kEnableWebRtcHWH264Encoding[];
 #endif
 
 #if defined(OS_ANDROID)

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"
@@ -23,17 +25,23 @@ 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) {
+    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) {
-    codecs->push_back(cricket::WebRtcVideoEncoderFactory::VideoCodec(
-        webrtc::kVideoCodecGeneric, "CAST1", width, height, fps));
+    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));
+  }
 }
 
 // Translate from cricket::WebRtcVideoEncoderFactory::VideoCodec to