Add window.postMessage() use counters.

Add window.postMessage() use counters.

Instrument postMessage() to determine usage of the overload

  postMessage(data, origin, transferables)

R=mkwst
BUG=425896
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=184160

[sof, 2014-10-22 07:53:22]

sigbjornf@opera.com changed reviewers:
+ jochen@chromium.org, mkwst@chromium.org

[sof, 2014-10-22 07:53:22]

Please take a look.

[Mike West, 2014-10-22 07:57:01]

LGTM. Might point to the blink-dev thread in the CL description, since I assume
that's what pointed you this way.

https://codereview.chromium.org/670893003/diff/1/Source/bindings/core/v8/cust...
File Source/bindings/core/v8/custom/V8WindowCustom.cpp (right):

https://codereview.chromium.org/670893003/diff/1/Source/bindings/core/v8/cust...
Source/bindings/core/v8/custom/V8WindowCustom.cpp:250:
UseCounter::countIfNotPrivateScript(info.GetIsolate(), window->document(),
UseCounter::WindowPostMessage);
Aside: Ooh. countIfNotPrivateScript is... verbose. When did that get added?

[sof, 2014-10-22 08:00:33]

https://codereview.chromium.org/670893003/diff/1/Source/bindings/core/v8/cust...
File Source/bindings/core/v8/custom/V8WindowCustom.cpp (right):

https://codereview.chromium.org/670893003/diff/1/Source/bindings/core/v8/cust...
Source/bindings/core/v8/custom/V8WindowCustom.cpp:250:
UseCounter::countIfNotPrivateScript(info.GetIsolate(), window->document(),
UseCounter::WindowPostMessage);
On 2014/10/22 07:57:01, Mike West wrote:
> Aside: Ooh. countIfNotPrivateScript is... verbose. When did that get added?

Added a couple of days ago, https://codereview.chromium.org/656693002/

(I wouldn't put it past private scripts to use postMessage(), hence its usage
here also.)

[sof, 2014-10-22 08:11:26]

On 2014/10/22 07:57:01, Mike West wrote:
> LGTM. Might point to the blink-dev thread in the CL description, since I
assume
> that's what pointed you this way.
> 

Thanks, added it to the linked-to bug instead (as those URLs are too bulky for
git commit messages.)

[sof, 2014-10-22 08:11:48]

The CQ bit was checked by sigbjornf@opera.com

[commit-bot: I haz the power, 2014-10-22 08:12:43]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/670893003/1

[commit-bot: I haz the power, 2014-10-22 10:16:49]

Committed patchset #1 (id:1) as 184160