[Tizen][extension] Add AVCodecs support in device capabilities

The main idea is as follows:

Utilize the APIs IsSupportedMediaMimeType, IsSupportedStrictMediaMimeType
and AreSupportedMediaCodecs in src/net/base/mime_util.h to iterate the local
codecs sets audio_codecs and video_codecs which we maintain to check if
the current codec is supported. If true, the codec will be added in the
supported media codecs list. The checking logic will refer WebMimeRegistry’s
supportsMediaMIMEType function.

spec: http://device-capabilities.sysapps.org/
feature: https://crosswalk-project.org/jira/browse/XWALK-47