Set the skia glyph cache count limit to 64

The skia glyph cache can use up to 4 GDI handles per cache entry (1 HFONT,
1 HBITMAP, 2 HDCs). There's a global (session-wide) limit of GDI handles
at 10k on some version of windows, so we need to keep the per-process handle
count well below this limit to avoid exhaustion. This sets the limit at 64
cache entries so the skia glyph cache will stay under ~256 handles per process.

BUG=314387

Review URL: https://codereview.chromium.org/60933003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@233531 0039d316-1c4b-4281-b951-d872f2087c98

skia/skia_library.gypi

@@ -441,6 +441,9 @@
 
     'SK_DEFAULT_FONT_CACHE_LIMIT=<(default_font_cache_limit)',
 
+     # http://crbug.com/314387
+    'SK_DEFAULT_FONT_CACHE_COUNT_LIMIT=64',
+
     'SK_DISABLE_BLUR_DIVISION_OPTIMIZATION',
   ],