[Chromecast] Make MatrixID enum uint8_t-based to match VideoColorSpace

chromecast/public/media/decoder_config.h

 // Copyright 2015 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 CHROMECAST_PUBLIC_MEDIA_DECODER_CONFIG_H_
 #define CHROMECAST_PUBLIC_MEDIA_DECODER_CONFIG_H_
 
 #include <stdint.h>
 #include <vector>
 
@@ skipping 194 matching lines @@
   BT2020_10 = 14,
   BT2020_12 = 15,
   SMPTEST2084 = 16,
   SMPTEST428_1 = 17,
 
   // Not yet standardized
   ARIB_STD_B67 = 18,  // AKA hybrid-log gamma, HLG.
 };
 
 // Table 4
-enum class MatrixID : int8_t {
+enum class MatrixID : uint8_t {
   RGB = 0,
   BT709 = 1,
   UNSPECIFIED = 2,
   FCC = 4,
   BT470BG = 5,
   SMPTE170M = 6,
   SMPTE240M = 7,
   YCOCG = 8,
   BT2020_NCL = 9,
   BT2020_CL = 10,
@@ skipping 161 matching lines @@
 inline bool IsValidConfig(const VideoConfig& config) {
   return config.codec >= kVideoCodecMin &&
       config.codec <= kVideoCodecMax &&
       config.codec != kVideoCodecUnknown;
 }
 
 }  // namespace media
 }  // namespace chromecast
 
 #endif  // CHROMECAST_PUBLIC_MEDIA_DECODER_CONFIG_H_