[chrome.displaySource] Implement hardware accelerated H.264 video encoder.

extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h

Index: extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h
diff --git a/extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h b/extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h
index ec17ef69b7582c39d09b8859092ae475916c1962..4573260d23f9833e41a8f06f56437e9797fdf5ea 100644
--- a/extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h
+++ b/extensions/renderer/api/display_source/wifi_display/wifi_display_video_encoder.h
@@ -65,6 +65,9 @@ class WiFiDisplayVideoEncoder : public WiFiDisplayMediaEncoder {
   void RequestIDRPicture();
 
  protected:
+  static void CreateVEA(const InitParameters& params,

[asargent_no_longer_on_chrome, 2016/04/26 19:12:08]

nit: it might be helpful to have a comment here (or maybe above in this file
before the first use of it in a name) defining what VEA stands for, since it's
not a commonly well-known acronym. 

[e_hakkinen, 2016/04/27 07:39:04]

Done.

+                        const VideoEncoderCallback& encoder_callback);
+
   explicit WiFiDisplayVideoEncoder(
       scoped_refptr<base::SingleThreadTaskRunner> media_task_runner);
   ~WiFiDisplayVideoEncoder() override;