Add v8.log visualizer page.

Add v8.log visualizer page.

R=jkummerow@chromium.org
BUG=

Committed: https://code.google.com/p/v8/source/detail?r=15292

[Yang, 2013-06-24 08:54:13]

This change includes:
- renaming of plot-timer-events.js to profviz/composer.js and refactoring its
content to reuse it for the page
- stdio.js as pipe adapter for composer.js
- profviz.js for the main thread of the page
- worker.js for the worker thread
- added exception to presubmit copyright check

Not included in this change:
- gnuplot's Javascript port because it's too large to upload

[Jakob Kummerow, 2013-06-24 11:03:33]

LGTM, just nits.

https://codereview.chromium.org/17592002/diff/1/tools/profviz/composer.js
File tools/profviz/composer.js (right):

https://codereview.chromium.org/17592002/diff/1/tools/profviz/composer.js#new...
tools/profviz/composer.js:49: var kTickHalfDuration = 0.5;      // Duration of
half a tick in seconds.
s/seconds/milliseconds/, I think

https://codereview.chromium.org/17592002/diff/1/tools/profviz/profviz.js
File tools/profviz/profviz.js (right):

https://codereview.chromium.org/17592002/diff/1/tools/profviz/profviz.js#newc...
tools/profviz/profviz.js:61: console.log(event.data);
is this intentional?

[Yang, 2013-06-24 11:17:18]

On 2013/06/24 11:03:33, Jakob wrote:
> LGTM, just nits.
> 
> https://codereview.chromium.org/17592002/diff/1/tools/profviz/composer.js
> File tools/profviz/composer.js (right):
> 
>
https://codereview.chromium.org/17592002/diff/1/tools/profviz/composer.js#new...
> tools/profviz/composer.js:49: var kTickHalfDuration = 0.5;      // Duration of
> half a tick in seconds.
> s/seconds/milliseconds/, I think
> 
> https://codereview.chromium.org/17592002/diff/1/tools/profviz/profviz.js
> File tools/profviz/profviz.js (right):
> 
>
https://codereview.chromium.org/17592002/diff/1/tools/profviz/profviz.js#newc...
> tools/profviz/profviz.js:61: console.log(event.data);
> is this intentional?

Thanks for the review! I fixed the milliseconds thing. I left the console.log
line there intentionally, but since it's not actually necessary, I removed it.
Also added copyright headers to the html and css files.

[Yang, 2013-06-24 13:26:14]

Committed patchset #4 manually as r15292 (presubmit successful).