Add bench_playback, for quick profiling of SKR playback.

Add bench_playback, for quick profiling of SKR playback.

It is not completely fair to compare --skr and --noskr numbers.  SKR looks
unfairly good because some optimizations are baked into our SKPs at record
time.  But, at least, by using a kWriteOnly_Mode SkRecorder, we prevent
SkPicturePlayback from compounding that unfairness.  SkRecordDraw must handle
its own playback-time optimizations (quickrejects) on its own.

This code should look suspiciously similar to bench_record.

BUG=skia:2378
Committed: http://code.google.com/p/skia/source/detail?r=14151

[f(malita), 2014-04-10 23:27:37]

lgtm

https://codereview.chromium.org/233833002/diff/60001/tools/bench_playback.cpp
File tools/bench_playback.cpp (right):

https://codereview.chromium.org/233833002/diff/60001/tools/bench_playback.cpp...
tools/bench_playback.cpp:49: int tool_main(int argc, char** argv);
Is this needed?

[mtklein, 2014-04-11 00:31:29]

On 2014/04/10 23:27:37, Florin Malita wrote:
> lgtm
> 
> https://codereview.chromium.org/233833002/diff/60001/tools/bench_playback.cpp
> File tools/bench_playback.cpp (right):
> 
>
https://codereview.chromium.org/233833002/diff/60001/tools/bench_playback.cpp...
> tools/bench_playback.cpp:49: int tool_main(int argc, char** argv);
> Is this needed?

Yeah, this is a weird necessity.  If we don't do this, our iOS build will break.
 And everyone knows that iOS build is important...

[mtklein, 2014-04-11 00:31:38]

The CQ bit was checked by mtklein@google.com

[commit-bot: I haz the power, 2014-04-11 00:31:40]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/233833002/60001

[commit-bot: I haz the power, 2014-04-11 00:31:41]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-11 00:31:42]

No LGTM from a valid reviewer yet. Only full committers are accepted.
Even if an LGTM may have been provided, it was from a non-committer or
a lowly provisional committer, _not_ a full super star committer.
See http://www.chromium.org/getting-involved/become-a-committer
Note that this has nothing to do with OWNERS files.

[mtklein, 2014-04-11 00:31:58]

lgtm

[commit-bot: I haz the power, 2014-04-11 00:32:00]

CQ is trying da patch. Follow status at
https://skia-tree-status.appspot.com/cq/mtklein@chromium.org/233833002/60001

[mtklein, 2014-04-11 01:22:35]

https://codereview.chromium.org/233833002/diff/60001/tools/bench_playback.cpp
File tools/bench_playback.cpp (right):

https://codereview.chromium.org/233833002/diff/60001/tools/bench_playback.cpp...
tools/bench_playback.cpp:49: int tool_main(int argc, char** argv);
On 2014/04/10 23:27:37, Florin Malita wrote:
> Is this needed?

Oh, I just realized you might have just meant, is the declaration necessary? 
Some of our compilers will yell at us (correctly but maybe pedantically so) for
defining tool_main before it's been declared.  tool_main, despite the
skia_static_function_style name, is extern, not static.  On iOS builds, it's
called by the real main that lives somewhere else.

[commit-bot: I haz the power, 2014-04-11 15:53:42]

Change committed as 14151