Add new GM to stress test the GPU font cache for cases similar to

Add new GM to stress test the GPU font cache for cases similar to
Chromium issue 303803.

BUG=303803
Committed: http://code.google.com/p/skia/source/detail?r=11673

Committed: http://code.google.com/p/skia/source/detail?r=11680

[robertphillips, 2013-10-09 15:23:49]

lgtm + nits & questions

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp
File gm/fontcache.cpp (right):

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode22
gm/fontcache.cpp:22: 
Is "20" missing on purpose?

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode26
gm/fontcache.cpp:26: 
DrawString?

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode35
gm/fontcache.cpp:35: FontCacheGM() {
Is this init expensive? Should it be moved to onOnceBeforeDraw?

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode36
gm/fontcache.cpp:36: fTypefaceCount = 0;
Where does 16*1024*1024 come from?

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode37
gm/fontcache.cpp:37: SkGraphics::SetFontCacheLimit(16 * 1024 * 1024);
should "unsigned long" just be size_t?

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode46
gm/fontcache.cpp:46: 
virtual?

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode53
gm/fontcache.cpp:53: protected:
override

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode57
gm/fontcache.cpp:57: 
override

https://codereview.chromium.org/26699002/diff/5001/gm/fontcache.cpp#newcode106
gm/fontcache.cpp:106: SkTypeface*
fTypefaces[SK_ARRAY_COUNT(gFamilyNames)*SK_ARRAY_COUNT(gStyles)];
Technically I don't think fTypefaceCount needs to be a member variable since it
should always be num(gFamilyNames) * num(gStyles), right?

[commit-bot: I haz the power, 2013-10-09 15:50:45]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/jvanverth@google.com/26699002/11001

[commit-bot: I haz the power, 2013-10-09 16:00:46]

Change committed as 11673

[commit-bot: I haz the power, 2013-10-09 18:01:19]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/jvanverth@google.com/26699002/18001

[commit-bot: I haz the power, 2013-10-09 18:12:27]

Change committed as 11680