Increase text layout cache size in bytes

The mark positioning changes increase the number of bytes needed per
glyph from 6 to 14. This patch compensates by allocating more total
memory for the text layout cache.

Change-Id: I3cf59547394a41779cf6e92e67688b0fdc85f1a3

Author: raphlinus

core/jni/android/graphics/TextLayoutCache.h

@@ -57,7 +57,7 @@
 #define MB(s) s * 1024 * 1024
 
 // Define the default cache size in Mb
-#define DEFAULT_TEXT_LAYOUT_CACHE_SIZE_IN_MB 0.250f
+#define DEFAULT_TEXT_LAYOUT_CACHE_SIZE_IN_MB 0.500f
 
 // Define the interval in number of cache hits between two statistics dump
 #define DEFAULT_DUMP_STATS_CACHE_HIT_INTERVAL 100