Rename benchmark classes, hopefully less confusing to valgrid?

Rename benchmark classes, hopefully less confusing to valgrid?

I was able to reproduce the problem, but Valgrind was giving me a very odd
report, pointing to a particular line in QuadTreeBench.cpp from a stack that
was running RTreeBench.

Whenever Valgrind complains, it's always about switch(fQuery), line 109 in
QuadTreeBench or 119 in RTreeBench.  I can't see any way that fQuery is not
initialized.

I believe we've just confused Valgrind by linking together  classes with
identical names.  This CL gives them all unique names.

BUG=skia:2455
Committed: http://code.google.com/p/skia/source/detail?r=14338

[mtklein, 2014-04-23 20:02:35]

First review's a winner!

[bungeman-skia, 2014-04-23 20:04:08]

lgtm

[mtklein, 2014-04-23 20:04:20]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-04-23 20:04:30]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/247913003/1

[commit-bot: I haz the power, 2014-04-23 21:03:47]

Change committed as 14338