Change the functions in video_capture_device to pass around PowerLineFrequency enums instead of int…

media/base/video_capture_types.h

 // Copyright (c) 2012 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.
 
 #ifndef MEDIA_BASE_VIDEO_CAPTURE_TYPES_H_
 #define MEDIA_BASE_VIDEO_CAPTURE_TYPES_H_
 
 #include <vector>
 
 #include "build/build_config.h"
@@ skipping 44 matching lines @@
 // Potential values of the googPowerLineFrequency optional constraint passed to
 // getUserMedia. Note that the numeric values are currently significant, and are
 // used to map enum values to corresponding frequency values.
 // TODO(ajose): http://crbug.com/525167 Consider making this a class.
 enum class PowerLineFrequency {
   FREQUENCY_DEFAULT = 0,
   FREQUENCY_50HZ = 50,
   FREQUENCY_60HZ = 60,
   FREQUENCY_MAX = FREQUENCY_60HZ
 };
+
 // Assert that the int:frequency mapping is correct.
 static_assert(static_cast<int>(PowerLineFrequency::FREQUENCY_DEFAULT) == 0,
               "static_cast<int>(FREQUENCY_DEFAULT) must equal 0.");
 static_assert(static_cast<int>(PowerLineFrequency::FREQUENCY_50HZ) == 50,
               "static_cast<int>(FREQUENCY_DEFAULT) must equal 50.");
 static_assert(static_cast<int>(PowerLineFrequency::FREQUENCY_60HZ) == 60,
               "static_cast<int>(FREQUENCY_DEFAULT) must equal 60.");
 
 // Some drivers use rational time per frame instead of float frame rate, this
 // constant k is used to convert between both: A fps -> [k/k*A] seconds/frame.
@@ skipping 62 matching lines @@
   // Policy for resolution change.
   ResolutionChangePolicy resolution_change_policy;
 
   // User-specified power line frequency.
   PowerLineFrequency power_line_frequency;
 };
 
 }  // namespace media
 
 #endif  // MEDIA_BASE_VIDEO_CAPTURE_TYPES_H_