Relanding WebRTC peerconnection iframe test.

Relanding WebRTC peerconnection iframe test.

This is a version of perkj's test in codereview.chromium.org/1073783003
which also covers a full peer connection call. It does not attempt to
verify the case where we nuke the iframe though since we don't know
what will happen past the gUM call in that call. The WebRTC call in
the iframe will just get torn down so there's not much we can test.

This fixes a bug in the test from the original patch, where we would
negotiate the call twice because of an iframe.onload quirk. This
actually worked except on Windows, but it's a degenerate use case we
should not test (except maybe in a fuzzer).

BUG=479093
Committed: https://crrev.com/98b51d8ead31a00a78f59c6bc7c187ee10f7a43e
Cr-Commit-Position: refs/heads/master@{#332586}

[phoglund_chromium, 2015-06-02 12:28:13]

phoglund@chromium.org changed reviewers:
+ kjellander@chromium.org

[kjellander_chromium, 2015-06-03 07:57:37]

nice! lgtm

https://codereview.chromium.org/1161403002/diff/20001/content/test/data/media...
File content/test/data/media/peerconnection-call.html (right):

https://codereview.chromium.org/1161403002/diff/20001/content/test/data/media...
content/test/data/media/peerconnection-call.html:575:
window.parent.reportTestSuccess);
nit: +2 spaces indent

[phoglund_chromium, 2015-06-03 08:31:54]

https://codereview.chromium.org/1161403002/diff/20001/content/test/data/media...
File content/test/data/media/peerconnection-call.html (right):

https://codereview.chromium.org/1161403002/diff/20001/content/test/data/media...
content/test/data/media/peerconnection-call.html:575:
window.parent.reportTestSuccess);
On 2015/06/03 07:57:36, kjellander wrote:
> nit: +2 spaces indent

Done.

[phoglund_chromium, 2015-06-03 08:31:58]

The CQ bit was checked by phoglund@chromium.org

[phoglund_chromium, 2015-06-03 08:31:58]

The patchset sent to the CQ was uploaded after l-g-t-m from
kjellander@chromium.org
Link to the patchset: https://codereview.chromium.org/1161403002/#ps40001
(title: "Fixing indent")

[commit-bot: I haz the power, 2015-06-03 08:32:35]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/1161403002/40001

[commit-bot: I haz the power, 2015-06-03 10:49:01]

Committed patchset #3 (id:40001)

[commit-bot: I haz the power, 2015-06-03 10:49:51]

Patchset 3 (id:??) landed as
https://crrev.com/98b51d8ead31a00a78f59c6bc7c187ee10f7a43e
Cr-Commit-Position: refs/heads/master@{#332586}