Add an IframeListener class for shepherding browser tests.

Add an IframeListener class for shepherding browser tests.

See #5

R=rnystrom@google.com, kevmoo@google.com

Committed: https://github.com/dart-lang/unittest/commit/602ab1ab022bf2412b9320e272655dff6368dc9d

[nweiz, 2015-02-27 20:44:03]

nweiz@google.com changed reviewers:
+ rnystrom@google.com
- kevmoo@google.com

[nweiz, 2015-02-27 20:44:03]

Sending to Bob instead.

[Bob Nystrom, 2015-02-27 21:09:49]

lgtm

https://codereview.chromium.org/958753002/diff/1/lib/src/runner/browser/ifram...
File lib/src/runner/browser/iframe_listener.dart (right):

https://codereview.chromium.org/958753002/diff/1/lib/src/runner/browser/ifram...
lib/src/runner/browser/iframe_listener.dart:83: if (message.origin !=
window.location.origin) return;
What's this for? Document it?

[nweiz, 2015-02-27 21:22:43]

Code review changes

[nweiz, 2015-02-27 21:23:45]

https://codereview.chromium.org/958753002/diff/1/lib/src/runner/browser/ifram...
File lib/src/runner/browser/iframe_listener.dart (right):

https://codereview.chromium.org/958753002/diff/1/lib/src/runner/browser/ifram...
lib/src/runner/browser/iframe_listener.dart:83: if (message.origin !=
window.location.origin) return;
On 2015/02/27 21:09:49, Bob Nystrom wrote:
> What's this for? Document it?

Done.

[nweiz, 2015-02-27 21:23:58]

Committed patchset #2 (id:20001) manually as
602ab1ab022bf2412b9320e272655dff6368dc9d (presubmit successful).