Add a way to monitor cache hits and misses for deferred decoding.

Adds a new flag to bench_pictures in order to do this. Also fix
a warning.

Review URL: https://codereview.chromium.org/12393046

git-svn-id: http://skia.googlecode.com/svn/trunk/gyp@7965 2bbb7eff-a529-9590-31e7-b0007b416f81
1 file changed