Fix Japanese font issue for devices running JB MR1 and higher.

Fix Japanese font issue for devices running JB MR1 and higher.

Android JB MR1 is using a new format of /system/etc/fallback_fonts.xml.
This CL preserves backwards compatibility, while also recognizing the
new fallback_fonts.xml format ("lang" attrbiute in <file/>).

NOTE: This CL was originally sumbitted for Chrome on Android (m18)

Committed: https://code.google.com/p/skia/source/detail?r=7448

[TomH, 2013-01-29 15:37:12]

gerrit-int isn't cooperating with me right now, but assuming this is the same
patch, LGTM.

Nit: line length > 100 col