add circle benchmark

add circle benchmark

This is used to measure how fast drawing a circle could be. When the
accelerated circle drawing is completed, we can see some improvements from this
bench.


BUG=
TEST=

[guanqun, 2012-04-11 01:20:57]

This CL is separated from this big CL (draw circle via gpu shader)
http://codereview.appspot.com/5696086/

Please review. Thanks!

[bsalomon, 2012-04-11 13:24:56]

On 2012/04/11 01:20:57, guanqun wrote:
> This CL is separated from this big CL (draw circle via gpu shader)
> http://codereview.appspot.com/5696086/
> 
> Please review. Thanks!

LGTM

[robertphillips, 2012-04-11 13:32:46]

http://codereview.appspot.com/5999047/diff/1/bench/PathBench.cpp
File bench/PathBench.cpp (right):

http://codereview.appspot.com/5999047/diff/1/bench/PathBench.cpp#newcode134
bench/PathBench.cpp:134: virtual void appendName(SkString* name) {
Please add SK_OVERRIDE to these virtual methods. This is a recent addition to
our coding standard so hasn't yet propagated through out all the code.

[bsalomon, 2012-04-11 15:34:55]

On 2012/04/11 13:32:46, robertphillips wrote:
> http://codereview.appspot.com/5999047/diff/1/bench/PathBench.cpp
> File bench/PathBench.cpp (right):
> 
> http://codereview.appspot.com/5999047/diff/1/bench/PathBench.cpp#newcode134
> bench/PathBench.cpp:134: virtual void appendName(SkString* name) {
> Please add SK_OVERRIDE to these virtual methods. This is a recent addition to
> our coding standard so hasn't yet propagated through out all the code.

I landed it at r3649 with SK_OVERRIDE added to all the overridden virtuals in
the file.

[guanqun, 2012-04-12 05:34:30]

http://codereview.appspot.com/5999047/diff/1/bench/PathBench.cpp
File bench/PathBench.cpp (right):

http://codereview.appspot.com/5999047/diff/1/bench/PathBench.cpp#newcode134
bench/PathBench.cpp:134: virtual void appendName(SkString* name) {
Thanks for your info about SK_OVERRIDE. I'll notice this later.