Add task queue to Call.

webrtc/media/engine/fakewebrtccall.h

Index: webrtc/media/engine/fakewebrtccall.h
diff --git a/webrtc/media/engine/fakewebrtccall.h b/webrtc/media/engine/fakewebrtccall.h
index 8581d829d659de1c50fb2aeb51007744c44cc5d9..6c687ef6d2d8d2a1f58051fd3aa3825d75217aa2 100644
--- a/webrtc/media/engine/fakewebrtccall.h
+++ b/webrtc/media/engine/fakewebrtccall.h
@@ -102,10 +102,10 @@ class FakeAudioReceiveStream final : public webrtc::AudioReceiveStream {
 class FakeVideoSendStream final : public webrtc::VideoSendStream,
                                   public webrtc::VideoCaptureInput {
  public:
-  FakeVideoSendStream(const webrtc::VideoSendStream::Config& config,
-                      const webrtc::VideoEncoderConfig& encoder_config);
-  webrtc::VideoSendStream::Config GetConfig() const;
-  webrtc::VideoEncoderConfig GetEncoderConfig() const;
+  FakeVideoSendStream(webrtc::VideoSendStream::Config config,
+                      webrtc::VideoEncoderConfig encoder_config);
+  const webrtc::VideoSendStream::Config& GetConfig() const;
+  const webrtc::VideoEncoderConfig& GetEncoderConfig() const;
   std::vector<webrtc::VideoStream> GetVideoStreams();
 
   bool IsSending() const;
@@ -128,8 +128,7 @@ class FakeVideoSendStream final : public webrtc::VideoSendStream,
   void Start() override;
   void Stop() override;
   webrtc::VideoSendStream::Stats GetStats() override;
-  void ReconfigureVideoEncoder(
-      const webrtc::VideoEncoderConfig& config) override;
+  void ReconfigureVideoEncoder(webrtc::VideoEncoderConfig config) override;
   webrtc::VideoCaptureInput* Input() override;
 
   bool sending_;
@@ -208,8 +207,8 @@ class FakeCall final : public webrtc::Call, public webrtc::PacketReceiver {
       webrtc::AudioReceiveStream* receive_stream) override;
 
   webrtc::VideoSendStream* CreateVideoSendStream(
-      const webrtc::VideoSendStream::Config& config,
-      const webrtc::VideoEncoderConfig& encoder_config) override;
+      webrtc::VideoSendStream::Config config,
+      webrtc::VideoEncoderConfig encoder_config) override;
   void DestroyVideoSendStream(webrtc::VideoSendStream* send_stream) override;
 
   webrtc::VideoReceiveStream* CreateVideoReceiveStream(