Add decrypt-only external clear key browser tests.

chrome/test/data/media/encrypted_media_utils.js

 // Copyright 2013 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 var keySystem = QueryString.keysystem;
 var mediaFile = QueryString.mediafile;
 var mediaType = QueryString.mediatype || 'video/webm; codecs="vorbis, vp8"';
 var useMSE = QueryString.usemse == 1;
 
 // Default key used to encrypt many media files used in browser tests.
 var KEY = new Uint8Array([0xeb, 0xdd, 0x62, 0xf1, 0x68, 0x14, 0xd2, 0x7b,
                           0x68, 0xef, 0x12, 0x2a, 0xfc, 0xe4, 0xae, 0x3c]);
 // KEY_ID constant used as init data while encrypting test media files.
 var KEY_ID = getInitDataFromKeyId("0123456789012345");
 // Heart beat message header.
 var HEART_BEAT_HEADER = 'HEARTBEAT';
 var EXTERNAL_CLEAR_KEY_KEY_SYSTEM = "org.chromium.externalclearkey";
+var DECRYPT_ONLY_EXTERNAL_CLEAR_KEY_KEY_SYSTEM =

[ddorwin, 2013/11/21 04:10:58]

we don't need this (see below)

[xhwang, 2013/11/22 01:47:36]

Done.

+    "org.chromium.externalclearkey.decryptonly";
 // Note that his URL has been normalized from the one in clear_key_cdm.cc.
 var EXTERNAL_CLEAR_KEY_HEARTBEAT_URL =
     'http://test.externalclearkey.chromium.org/';
 
 function isHeartbeatMessage(msg) {
   if (msg.length < HEART_BEAT_HEADER.length)
     return false;
   for (var i = 0; i < HEART_BEAT_HEADER.length; ++i) {
     if (String.fromCharCode(msg[i]) != HEART_BEAT_HEADER[i])
       return false;
@@ skipping 70 matching lines @@
     // keymessage in response to generateKeyRequest. Reply with key.
     console.log('onKeyMessage - key request', e);
     var initData = e.message;
     if (mediaType.indexOf('mp4') != -1)
       initData = KEY_ID; // Temporary hack for Clear Key in v0.1.
     video.webkitAddKey(keySystem, key, initData);
   }
 
   function verifyHeartbeatMessage(e) {
     // Only External Clear Key sends a HEARTBEAT message.
-    if (e.keySystem != EXTERNAL_CLEAR_KEY_KEY_SYSTEM) {
+    if (e.keySystem != EXTERNAL_CLEAR_KEY_KEY_SYSTEM &&
+        e.keySystem != DECRYPT_ONLY_EXTERNAL_CLEAR_KEY_KEY_SYSTEM) {

[ddorwin, 2013/11/21 04:10:58]

Just check the beginning.

[xhwang, 2013/11/22 01:47:36]

Done.

       failTest('Unexpected heartbeat from ' + e.keySystem);
       return;
     }
 
     if (e.defaultURL != EXTERNAL_CLEAR_KEY_HEARTBEAT_URL) {
       failTest('Heartbeat message with unexpected defaultURL: ' + e.defaultURL);
       return;
     }
   }
 
@@ skipping 14 matching lines @@
   }
 }
 
 function getInitDataFromKeyId(keyID) {
   var init_key_id = new Uint8Array(keyID.length);
   for(var i = 0; i < keyID.length; i++) {
     init_key_id[i] = keyID.charCodeAt(i);
   }
   return init_key_id;
 }