Add method cricket::VideoCapturer::NeedsDenoising, use in VideoCapturerTrackSource.

webrtc/media/base/videocapturer.h

 /*
  *  Copyright (c) 2010 The WebRTC project authors. All Rights Reserved.
  *
  *  Use of this source code is governed by a BSD-style license
  *  that can be found in the LICENSE file in the root of the source
  *  tree. An additional intellectual property rights grant can be found
  *  in the file PATENTS.  All contributing project authors may
  *  be found in the AUTHORS file in the root of the source tree.
  */
 
@@ skipping 157 matching lines @@
   CaptureState capture_state() const {
     return capture_state_;
   }
 
   virtual bool apply_rotation() { return apply_rotation_; }
 
   // Returns true if the capturer is screencasting. This can be used to
   // implement screencast specific behavior.
   virtual bool IsScreencast() const = 0;
 
+  // Indicates that the encoder should denoise video before encoding
+  // it, wired up to VideoCapturerTrackSource::needs_denoising. If it
+  // is not set, the default configuration is used which is different
+  // depending on video codec.
+  // TODO(nisse): This is a workaround needed to fix
+  // https://bugs.chromium.org/p/chromium/issues/detail?id=645907.
+  // Chrome should migrate to implement VideoTrackSourceInterface
+  // directly, and then this method is no longer needed.
+  virtual rtc::Optional<bool> NeedsDenoising() const {
+    return rtc::Optional<bool>();
+  }
+
   // Caps the VideoCapturer's format according to max_format. It can e.g. be
   // used to prevent cameras from capturing at a resolution or framerate that
   // the capturer is capable of but not performing satisfactorily at.
   // The capping is an upper bound for each component of the capturing format.
   // The fourcc component is ignored.
   void ConstrainSupportedFormats(const VideoFormat& max_format);
 
   void set_enable_camera_list(bool enable_camera_list) {
     enable_camera_list_ = enable_camera_list;
   }
@@ skipping 139 matching lines @@
   bool apply_rotation_;
 
   // State for the timestamp translation.
   rtc::TimestampAligner timestamp_aligner_;
   RTC_DISALLOW_COPY_AND_ASSIGN(VideoCapturer);
 };
 
 }  // namespace cricket
 
 #endif  // WEBRTC_MEDIA_BASE_VIDEOCAPTURER_H_