[Cast] Make decoder_config.h usable without decoder_config_adapter.cc

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 269 matching lines @@
 
 // HDR metadata common for HDR10 and WebM/VP9-based HDR formats.
 struct HDRMetadata {
   MasteringMetadata mastering_metadata;
   unsigned max_cll = 0;
   unsigned max_fall = 0;
 
   HDRMetadata();
   HDRMetadata(const HDRMetadata& rhs);
 };
+
+inline MasteringMetadata::MasteringMetadata() {}
+inline MasteringMetadata::MasteringMetadata(const MasteringMetadata& rhs) =
+    default;
+
+inline HDRMetadata::HDRMetadata() {}
+inline HDRMetadata::HDRMetadata(const HDRMetadata& rhs) = default;
 // ---- End copy/paste from media/base/hdr_metadata.h ----
 
 // TODO(erickung): Remove constructor once CMA backend implementation doesn't
 // create a new object to reset the configuration and use IsValidConfig() to
 // determine if the configuration is still valid or not.
 struct AudioConfig {
   AudioConfig();
   AudioConfig(const AudioConfig& other);
   ~AudioConfig();
 
@@ skipping 96 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_