[chrome.displaySource] Move video stream info creation to encoders.

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 d992d4742f9ce0c668d638519f7e85ad9a6e520c..872d52c1650c099f042a35d10f57dbfe81fb8467 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
@@ -5,7 +5,10 @@
 #ifndef EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_VIDEO_ENCODER_H_
 #define EXTENSIONS_RENDERER_API_DISPLAY_SOURCE_WIFI_DISPLAY_WIFI_DISPLAY_VIDEO_ENCODER_H_
 
+#include <vector>
+
 #include "base/memory/shared_memory.h"
+#include "extensions/renderer/api/display_source/wifi_display/wifi_display_elementary_stream_descriptor.h"
 #include "extensions/renderer/api/display_source/wifi_display/wifi_display_media_encoder.h"
 #include "media/base/video_frame.h"
 #include "media/video/video_encode_accelerator.h"
@@ -54,6 +57,9 @@ class WiFiDisplayVideoEncoder : public WiFiDisplayMediaEncoder {
   static void Create(const InitParameters& params,
                      const VideoEncoderCallback& encoder_callback);
 
+  // WiFiDisplayMediaEncoder
+  WiFiDisplayElementaryStreamInfo CreateElementaryStreamInfo() const final;
+
   // Encodes the given raw frame. The resulting encoded frame is passed
   // as an |encoded_callback|'s argument which is set via 'SetCallbacks'
   // method.
@@ -74,6 +80,9 @@ class WiFiDisplayVideoEncoder : public WiFiDisplayMediaEncoder {
       scoped_refptr<base::SingleThreadTaskRunner> media_task_runner);
   ~WiFiDisplayVideoEncoder() override;
 
+  virtual std::vector<WiFiDisplayElementaryStreamDescriptor>
+  CreateElementaryStreamDescriptors() const;
+
   virtual void InsertFrameOnMediaThread(
       scoped_refptr<media::VideoFrame> video_frame,
       base::TimeTicks reference_time,