This patch removes the directory mtime check for the font cache.  This will
allow us to build the font cache on a separate machine and distribute the
cache files as a pre-built package, which will speed up developer build times
for ARM devices by up to 9 minutes.  See crbug.com/205424 for more details.

diff --git a/src/fccache.c b/src/fccache.c
index 7abb750..742cb89 100644
--- a/src/fccache.c
+++ b/src/fccache.c
@@ -748,7 +748,14 @@ FcCacheTimeValid (FcConfig *config, FcCache *cache, struct stat *dir_stat)
 		FcCacheDir (cache), cache->checksum, (int) dir_stat->st_mtime);
 #endif
 
-    return cache->checksum == (int) dir_stat->st_mtime && fnano;
+    /*
+     * Always assume the directory mtime is valid.  On Chrome OS, we build the
+     * font cache on the builders and distribute them as a pre-built package.
+     * This means that the mtimes on the target systems will not match the mtime
+     * stored in the cache.  However, the contents of the cache should still be
+     * valid so just ignore this check.
+     */
+    return FcTrue;
 }
 
 static FcBool