Add a function to convert key system into UUID

webkit/renderer/media/crypto/key_systems_unittest.cc

 // 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.
 
 #include <string>
 #include <vector>
 
 #include "testing/gtest/include/gtest/gtest.h"
 #include "third_party/WebKit/public/platform/WebString.h"
 #include "webkit/renderer/media/crypto/key_systems.h"
@@ skipping 735 matching lines @@
   EXPECT_FALSE(IsSupportedKeySystemWithMediaMimeType(
       "audio/mp4", avc1_codec(), kWidevineAlpha));
   EXPECT_FALSE(IsSupportedKeySystemWithMediaMimeType(
       "audio/mp4", avc1_and_aac_codecs(), kWidevineAlpha));
 
   // Non-MP4 codec.
   EXPECT_FALSE(IsSupportedKeySystemWithMediaMimeType(
       "audio/mp4", vorbis_codec(), kWidevineAlpha));
 }
 
+TEST_F(KeySystemsTest, ConvertKeySystemToUUID) {
+  // Currently only widevine is supported.

[ddorwin, 2013/06/20 03:07:27]

You probably don't need this comment, and it could get out of date.

[qinmin, 2013/06/20 17:41:53]

Done.

+  std::vector<uint8> uuid = ConvertKeySystemToAndroidUUID(kWidevineAlpha);
+  EXPECT_EQ(16u, uuid.size());
+
+  // Fail on all other key systems.
+  uuid = ConvertKeySystemToAndroidUUID(kWidevine);
+  EXPECT_EQ(0u, uuid.size());
+  uuid = ConvertKeySystemToAndroidUUID(kClearKey);
+  EXPECT_EQ(0u, uuid.size());
+  uuid = ConvertKeySystemToAndroidUUID("");
+  EXPECT_EQ(0u, uuid.size());
+}
+
 }  // namespace webkit_media