[Mojo Video Capture] Simplify API and some cleanups

services/video_capture/video_capture_device_proxy_impl.cc

 // Copyright 2016 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "services/video_capture/video_capture_device_proxy_impl.h"
 
 #include "base/logging.h"
 #include "media/capture/video/video_capture_buffer_pool_impl.h"
 #include "media/capture/video/video_capture_jpeg_decoder.h"
 #include "services/video_capture/buffer_tracker_factory_impl.h"
 #include "services/video_capture/receiver_mojo_to_media_adapter.h"
 
 namespace video_capture {
 
 VideoCaptureDeviceProxyImpl::VideoCaptureDeviceProxyImpl(
     std::unique_ptr<media::VideoCaptureDevice> device,
     const media::VideoCaptureJpegDecoderFactoryCB&
         jpeg_decoder_factory_callback)
     : device_(std::move(device)),
       jpeg_decoder_factory_callback_(jpeg_decoder_factory_callback),
       device_running_(false) {}
 
 VideoCaptureDeviceProxyImpl::~VideoCaptureDeviceProxyImpl() {
   if (device_running_)
     device_->StopAndDeAllocate();
 }
 
 void VideoCaptureDeviceProxyImpl::Start(
-   const media::VideoCaptureFormat& requested_format,
-    media::ResolutionChangePolicy resolution_change_policy,
-    media::PowerLineFrequency power_line_frequency,
+    const VideoCaptureSettings& requested_settings,
     mojom::VideoFrameReceiverPtr receiver) {
   media::VideoCaptureParams params;
-  params.requested_format = requested_format;
-  params.resolution_change_policy = resolution_change_policy;
-  params.power_line_frequency = power_line_frequency;
+  requested_settings.ConvertToMediaVideoCaptureParams(&params);
   receiver.set_connection_error_handler(
       base::Bind(&VideoCaptureDeviceProxyImpl::OnClientConnectionErrorOrClose,
                  base::Unretained(this)));
 
   auto media_receiver =
       base::MakeUnique<ReceiverMojoToMediaAdapter>(std::move(receiver));
 
   // Create a dedicated buffer pool for the device usage session.
   const int kMaxBufferCount = 2;
   auto buffer_tracker_factory = base::MakeUnique<BufferTrackerFactoryImpl>();
@@ skipping 14 matching lines @@
 }
 
 void VideoCaptureDeviceProxyImpl::OnClientConnectionErrorOrClose() {
   if (device_running_) {
     device_->StopAndDeAllocate();
     device_running_ = false;
   }
 }
 
 }  // namespace video_capture