canPlayType could return maybe/probably for VP9 in android

VP9 support was added to android in Kitkat. Changing canPlayType to return
probably/maybe if running on kitkat or higher.

Review URL: https://codereview.chromium.org/66863003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234701 0039d316-1c4b-4281-b951-d872f2087c98
Try a different arbitrary SkGlyphCache cap (64 -> 256)

We're hitting a lot of crashes in skia::CreateCanvas that may be due to GDI
handle exhaustion.  This picks a different arbitrary limit for the number
of entries in this cache to try to see if the crashes are correlated. Changing
this cap from 2048->64 was perf neutral on the bots, so 64->256 is also
expected to be neutral.

TBR=reed
NOTRY=true
BUG=275046,314387

Review URL: https://codereview.chromium.org/71043002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@234702 0039d316-1c4b-4281-b951-d872f2087c98
SVN changes up to revision 234701
SVN changes up to revision 234702