Android: enable WebRTC HW H264 with a flag by default

content/public/common/content_features.cc

Index: content/public/common/content_features.cc
diff --git a/content/public/common/content_features.cc b/content/public/common/content_features.cc
index ff879647c77ed45de491a7d72d64f44e12ffcdeb..dd3c051940988a6922d451edba040752e112496e 100644
--- a/content/public/common/content_features.cc
+++ b/content/public/common/content_features.cc
@@ -223,6 +223,10 @@ const base::Feature kWebRtcUseGpuMemoryBufferVideoFrames{
     "WebRTC-UseGpuMemoryBufferVideoFrames",
     base::FEATURE_DISABLED_BY_DEFAULT};
 
+// Enables HW H264 encoding on Android.
+const base::Feature kWebRtcHWH264Encoding{
+    "WebRtcHWH264Encoding", base::FEATURE_ENABLED_BY_DEFAULT};
+
 // Controls whether the WebUSB API is enabled:
 // https://wicg.github.io/webusb
 const base::Feature kWebUsb{"WebUSB", base::FEATURE_ENABLED_BY_DEFAULT};