Add a UseCounter for the HTMLSourceElement.media IDL attribute

Add a UseCounter for the HTMLSourceElement.media IDL attribute

The content attribute no longer does anything, so the IDL attribute
should also be removed as soon as the usage allows.

BUG=338197
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=166044

[philipj_slow, 2014-01-27 02:06:39]

Adam, can you take this one as well? This needs to be committed after
https://codereview.chromium.org/146483002/ for the commit messages to be
correct, so please don't check the commit box on this one.

[adamk, 2014-01-28 23:50:20]

You'll need an IDL owner here, adding eseidel.

[eseidel, 2014-01-29 01:17:01]

lgtm

[commit-bot: I haz the power, 2014-01-29 01:17:46]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/146483002/1

[commit-bot: I haz the power, 2014-01-29 01:17:51]

Failed to apply patch for Source/core/frame/UseCounter.h:
While running patch -p1 --forward --force --no-backup-if-mismatch;
  patching file Source/core/frame/UseCounter.h
  Hunk #1 FAILED at 302.
  1 out of 1 hunk FAILED -- saving rejects to file
Source/core/frame/UseCounter.h.rej

Patch:       Source/core/frame/UseCounter.h
Index: Source/core/frame/UseCounter.h
diff --git a/Source/core/frame/UseCounter.h b/Source/core/frame/UseCounter.h
index
a358ef32ec06f6ac61f04b022b29dd783efb6636..27bb4233dbc97f7298c9e934231a4c1c0c40e7f1
100644
--- a/Source/core/frame/UseCounter.h
+++ b/Source/core/frame/UseCounter.h
@@ -302,6 +302,7 @@ public:
         ContentSecurityPolicyReportOnlyInMeta,
         PrefixedMediaSourceOpen,
         ResetReferrerPolicy,
+        HTMLSourceElementMedia,
         // Add new features immediately above this line. Don't change assigned
         // numbers of any item, and don't reuse removed slots.
         NumberOfFeatures, // This enum value must be last.

[commit-bot: I haz the power, 2014-01-29 01:23:05]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-29 02:28:51]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/146483002/60001

[commit-bot: I haz the power, 2014-01-29 06:08:31]

CQ bit was unchecked on CL. Ignoring.

[commit-bot: I haz the power, 2014-01-29 17:00:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/146483002/60001

[commit-bot: I haz the power, 2014-01-29 18:54:04]

Change committed as 166044

[commit-bot: I haz the power, 2014-01-29 18:54:28]

CQ bit was unchecked on CL. Ignoring.