Update EME polyfill to the latest draft spec.

Fixes the session type strings for persistent sessions.
Adds a comment about the key statuses we deliberately ignore.

Change-Id: I698bc91e46b863cc8cccd0e7509c503d1410d814

externs/mediakeys.js

@@ -14,7 +14,7 @@
  * limitations under the License.
  *
  * @fileoverview MediaKey externs.
- * Based on {@link http://goo.gl/5gifok EME draft 09 February 2015}.
+ * Based on {@link http://goo.gl/blgtZZ EME draft 12 March 2015}.
  * @externs
  */
 

lib/media/eme_manager.js

@@ -500,6 +500,7 @@ shaka.media.EmeManager.prototype.requestLicense_ =
  * @const
  */
 shaka.media.EmeManager.KEY_STATUS_ERROR_MAP_ = {
+  // usable, output-downscaled, and status-pending do not result in errors.
   'output-not-allowed': 'The required output protection is not available.',
   'expired': 'A required key has expired and the content cannot be decrypted.',
   'internal-error': 'An unknown error has occurred in the CDM.'

lib/polyfill/patchedmediakeys_nop.js

@@ -13,8 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * @fileoverview A polyfill to stub out {@link http://goo.gl/5gifok EME draft
- * 09 February 2015} on browsers without EME.  All methods will fail.
+ * @fileoverview A polyfill to stub out {@link http://goo.gl/blgtZZ EME draft
+ * 12 March 2015} on browsers without EME.  All methods will fail.
  *
  * @see http://enwp.org/polyfill
  */

lib/polyfill/patchedmediakeys_v01b.js

@@ -13,8 +13,8 @@
  * See the License for the specific language governing permissions and
  * limitations under the License.
  *
- * @fileoverview A polyfill to implement {@link http://goo.gl/5gifok EME draft
- * 09 February 2015} on top of {@link http://goo.gl/FSpoAo EME v0.1b}.
+ * @fileoverview A polyfill to implement {@link http://goo.gl/blgtZZ EME draft
+ * 12 March 2015} on top of {@link http://goo.gl/FSpoAo EME v0.1b}.
  *
  * @see http://enwp.org/polyfill
  */
@@ -326,7 +326,11 @@ shaka.polyfill.PatchedMediaKeys.v01b.MediaKeys.prototype.createSession =
   shaka.log.debug('v01b.MediaKeys.createSession');
 
   var sessionType = opt_sessionType || 'temporary';
-  if (sessionType != 'temporary' && sessionType != 'persistent') {
+  // TODO: Consider adding support for persistent-release once Chrome has
+  // implemented it natively.  http://crbug.com/448888
+  // This is a non-issue if we've deprecated the polyfill by then, since
+  // prefixed EME is on its way out.
+  if (sessionType != 'temporary' && sessionType != 'persistent-license') {
     throw new TypeError('Session type ' + opt_sessionType +
                         ' is unsupported on this platform.');
   }
@@ -621,7 +625,7 @@ shaka.polyfill.PatchedMediaKeys.v01b.MediaKeySession.prototype.generate_ =
     /** @type {Uint8Array} */
     var mangledInitData;
 
-    if (this.type_ == 'persistent') {
+    if (this.type_ == 'persistent-license') {
       var Uint8ArrayUtils = shaka.util.Uint8ArrayUtils;
       if (!offlineSessionId) {
         // Persisting the initial license.
@@ -767,12 +771,12 @@ shaka.polyfill.PatchedMediaKeys.v01b.MediaKeySession.prototype.generateRequest =
 shaka.polyfill.PatchedMediaKeys.v01b.MediaKeySession.prototype.load =
     function(sessionId) {
   shaka.log.debug('v01b.MediaKeySession.load');
-  if (this.type_ == 'persistent') {
+  if (this.type_ == 'persistent-license') {
     var nextGeneratePromise = new shaka.util.PublicPromise();
     this.generate_(nextGeneratePromise, null, sessionId);
     return nextGeneratePromise;
   } else {
-    return Promise.reject(new Error('The session type is not "persistent".'));
+    return Promise.reject(new Error('Not a persistent session.'));
   }
 };
 
@@ -796,7 +800,7 @@ shaka.polyfill.PatchedMediaKeys.v01b.MediaKeySession.prototype.close =
 
   // This will remove a persistent session, but it's also the only way to
   // free CDM resources on v0.1b.
-  if (this.type_ != 'persistent') {
+  if (this.type_ != 'persistent-license') {
     // sessionId may reasonably be null if no key request has been generated
     // yet.  Unprefixed EME will return a rejected promise in this case.
     // We will use the same error message that Chrome 41 uses in its EME
@@ -819,7 +823,7 @@ shaka.polyfill.PatchedMediaKeys.v01b.MediaKeySession.prototype.remove =
     function() {
   shaka.log.debug('v01b.MediaKeySession.remove');
 
-  if (this.type_ != 'persistent') {
+  if (this.type_ != 'persistent-license') {
     return Promise.reject(new Error('Not a persistent session.'));
   }