[chrome.displaySource] Add common functionality to base 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 c612089b1ffb0771fc491d98c9ca47135d33b599..99741006f2f7947c9f75d93bceb0c4fc6cb07fdd 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
@@ -78,13 +78,12 @@ class WiFiDisplayVideoEncoder :
   // Encodes the given raw frame. The resulting encoded frame is passed
   // as an |encoded_callback|'s argument which is set via 'SetCallbacks'
   // method.
-  virtual void InsertRawVideoFrame(
-      const scoped_refptr<media::VideoFrame>& video_frame,
-      base::TimeTicks reference_time) = 0;
+  void InsertRawVideoFrame(const scoped_refptr<media::VideoFrame>& video_frame,
+                           base::TimeTicks reference_time);
 
   // Requests the next encoded frame to be an instantaneous decoding refresh
   // (IDR) picture.
-  virtual void RequestIDRPicture() = 0;
+  void RequestIDRPicture() { send_idr_ = true; }

[Mikhail, 2016/04/22 09:28:34]

pls. move body to .cc

[e_hakkinen, 2016/04/22 09:54:50]

Done.

 
   // Sets callbacks for the obtained encoder instance:
   // |encoded_callback| is invoked to return the next encoded frame
@@ -94,11 +93,19 @@ class WiFiDisplayVideoEncoder :
 
  protected:
   friend class base::RefCountedThreadSafe<WiFiDisplayVideoEncoder>;
-  WiFiDisplayVideoEncoder();
+  WiFiDisplayVideoEncoder(

[Mikhail, 2016/04/22 09:28:34]

explicit

[e_hakkinen, 2016/04/22 09:54:50]

Done.

+      const scoped_refptr<base::SingleThreadTaskRunner>& media_task_runner);

[Mikhail, 2016/04/22 09:28:34]

think we can pass just scoped_refptr<base::SingleThreadTaskRunner> and use move
semantics.

[e_hakkinen, 2016/04/22 09:54:50]

Done.

   virtual ~WiFiDisplayVideoEncoder();
 
+  virtual void InsertFrameOnMediaThread(
+      scoped_refptr<media::VideoFrame> video_frame,
+      base::TimeTicks reference_time,
+      bool send_idr) = 0;
+
   EncodedFrameCallback encoded_callback_;
   base::Closure error_callback_;
+  scoped_refptr<base::SingleThreadTaskRunner> media_task_runner_;
+  bool send_idr_;
 };
 
 }  // namespace extensions