Add frame refresh to VideoCaptureDevice, and buffer pool resurrection.

media/capture/video/video_capture_device.cc

 // Copyright 2013 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 "media/capture/video/video_capture_device.h"
 
 #include "base/command_line.h"
 #include "base/i18n/timezone.h"
+#include "base/logging.h"
 #include "base/macros.h"
 #include "base/strings/string_util.h"
 #include "build/build_config.h"
 #include "media/base/media_switches.h"
 
 namespace media {
 
 // TODO(msu.koo): http://crbug.com/532272, remove checking the switch in favour
 // of deferring GetModel() call to the actual VideoCaptureDevice object.
 const std::string VideoCaptureDevice::Name::GetNameAndModel() const {
@@ skipping 119 matching lines @@
   }
 }
 #endif
 
 VideoCaptureDevice::Client::Buffer::~Buffer() {
 }
 
 VideoCaptureDevice::~VideoCaptureDevice() {
 }
 
+void VideoCaptureDevice::RequestRefreshFrame() {
+  DVLOG(2) << "Ignoring request for refresh frame (no implementation).";

[emircan, 2016/03/25 22:44:24]

|NOTIMPLEMENTED();| ?

[miu, 2016/03/25 23:13:48]

This wouldn't be appropriate for normal webcams.  They all do not need to do
anything since they provide constant frame-rate video.

No longer applicable, since I made the no-op default explicit in the header file
(per your other comment).

+}
+
 PowerLineFrequency VideoCaptureDevice::GetPowerLineFrequencyForLocation()
     const {
   const std::string current_country = base::CountryCodeForCurrentTimezone();
   if (current_country.empty())
     return PowerLineFrequency::FREQUENCY_DEFAULT;
   // Sorted out list of countries with 60Hz power line frequency, from
   // http://en.wikipedia.org/wiki/Mains_electricity_by_country
   const char* countries_using_60Hz[] = {
       "AI", "AO", "AS", "AW", "AZ", "BM", "BR", "BS", "BZ", "CA", "CO",
       "CR", "CU", "DO", "EC", "FM", "GT", "GU", "GY", "HN", "HT", "JP",
@@ skipping 13 matching lines @@
   switch (params.power_line_frequency) {
     case media::PowerLineFrequency::FREQUENCY_50HZ:  // fall through
     case media::PowerLineFrequency::FREQUENCY_60HZ:
       return params.power_line_frequency;
     default:
       return GetPowerLineFrequencyForLocation();
   }
 }
 
 }  // namespace media