Add a UseCounter for Notification.permission

Add a UseCounter for Notification.permission

While this is a relatively new property, it does require a synchronous IPC
to the browser process in order to get the permission status, and thus would
be better as a Notification.hasPermission() method returning a Promise (or
similar).

Since we will need a similar construct for Push Messaging, and potentially
other APIs, let's get some data on whether developers use this to see if
we can get a more common, asynchronous approach.

BUG=

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=173004

[abarth-chromium, 2014-04-29 19:32:22]

lgtm

[Peter Beverloo, 2014-04-29 19:34:32]

The CQ bit was checked by peter@chromium.org

[commit-bot: I haz the power, 2014-04-29 19:35:27]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/peter@chromium.org/254023002/1

[commit-bot: I haz the power, 2014-04-30 04:47:06]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-30 04:47:06]

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 #3 FAILED at 368.
  1 out of 3 hunks 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
7784a8d2ff7bd6dad5e7c58f356747fd6a8cb5f3..475b691217324a1cec0667a6e3ae87bbd43b0131
100644
--- a/Source/core/frame/UseCounter.h
+++ b/Source/core/frame/UseCounter.h
@@ -62,7 +62,6 @@ public:
         // Do not change assigned numbers of existing items: add new features
         // to the end of the list.
         PageDestruction = 0,
-        LegacyNotifications = 1,
         PrefixedIndexedDB = 3,
         WorkerStart = 4,
         SharedWorkerStart = 5,
@@ -70,7 +69,6 @@ public:
         WebAudioStart = 7,
         UnprefixedIndexedDB = 9,
         OpenWebDatabase = 10,
-        LegacyTextNotifications = 12,
         UnprefixedRequestAnimationFrame = 13,
         PrefixedRequestAnimationFrame = 14,
         ContentSecurityPolicy = 15,
@@ -370,6 +368,7 @@ public:
         EventGetReturnValueFalse = 351,
         EventSetReturnValueTrue = 352,
         EventSetReturnValueFalse = 353,
+        NotificationPermission = 354,
         // 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.

[Peter Beverloo, 2014-04-30 13:58:20]

The CQ bit was checked by peter@chromium.org

[commit-bot: I haz the power, 2014-04-30 13:58:35]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/peter@chromium.org/254023002/20001

[commit-bot: I haz the power, 2014-04-30 14:16:07]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-04-30 14:16:07]

Try jobs failed on following builders:
  linux_blink_dbg on tryserver.blink

[Peter Beverloo, 2014-04-30 16:08:50]

The CQ bit was checked by peter@chromium.org

[commit-bot: I haz the power, 2014-04-30 16:08:59]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/peter@chromium.org/254023002/20001

[commit-bot: I haz the power, 2014-04-30 17:15:38]

Change committed as 173004