Add a UseCounter for the HTMLMediaElement.canPlayType keySystem argument

Add a UseCounter for the HTMLMediaElement.canPlayType keySystem argument

This has been replaced in the spec by MediaKeys.isTypeSupported:

https://dvcs.w3.org/hg/html-media/raw-file/tip/encrypted-media/encrypted-media.html#extensions

Add a counter now so that we have the data needed for removal when the
new spec has been implemented.

BUG=334941
Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=165312

[acolwell GONE FROM CHROMIUM, 2014-01-16 18:10:06]

lgtm

[ddorwin, 2014-01-16 18:15:33]

lgtm

[commit-bot: I haz the power, 2014-01-16 18:37:54]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/135003003/1

[commit-bot: I haz the power, 2014-01-16 21:31:41]

Retried try job too often on linux_blink for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2014-01-17 00:12:39]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/135003003/1

[commit-bot: I haz the power, 2014-01-17 01:04:18]

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 285.
  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
64cd844654c1eee630083dc2c6931e5d1344d23a..babc83b33845810f2027fdca00281a8f0fd4a586
100644
--- a/Source/core/frame/UseCounter.h
+++ b/Source/core/frame/UseCounter.h
@@ -285,6 +285,7 @@ public:
         ElementSetPrefix, // Element.prefix is readonly in DOM4.
         CSSStyleDeclarationGetPropertyCSSValue,
         SVGElementGetPresentationAttribute,
+        CanPlayTypeKeySystem,
         // Add new features immediately above this line. Don't change assigned
         // numbers of each items, and don't reuse unused slots.
         NumberOfFeatures, // This enum value must be last.

[commit-bot: I haz the power, 2014-01-17 01:43:41]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/135003003/170001

[commit-bot: I haz the power, 2014-01-17 02:31:05]

Retried try job too often on linux_blink_rel for step(s) webkit_unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2014-01-17 02:58:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/135003003/170001

[commit-bot: I haz the power, 2014-01-17 03:21:24]

Retried try job too often on linux_blink_rel for step(s) webkit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2014-01-17 04:29:20]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/135003003/170001

[commit-bot: I haz the power, 2014-01-17 04:52:23]

Retried try job too often on linux_blink for step(s) webkit_unit_tests
http://build.chromium.org/p/tryserver.chromium/buildstatus?builder=linux_blin...

[commit-bot: I haz the power, 2014-01-17 13:57:49]

CQ is trying da patch. Follow status at
https://chromium-status.appspot.com/cq/philipj@opera.com/135003003/480001

[commit-bot: I haz the power, 2014-01-17 15:12:45]

Change committed as 165312