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)

Review URL: https://codereview.appspot.com/7226053

csulmone/skia,csulmone/skia,csulmone/skia,csulmone/skia