Add platform APIs for the unprefixed EME APIs.

public/platform/WebContentDecryptionModuleSession.h

+/*
+ * Copyright (C) 2013 Google Inc. All rights reserved.
+ *
+ * Redistribution and use in source and binary forms, with or without
+ * modification, are permitted provided that the following conditions are
+ * met:
+ *
+ *     * Redistributions of source code must retain the above copyright
+ * notice, this list of conditions and the following disclaimer.
+ *     * Redistributions in binary form must reproduce the above
+ * copyright notice, this list of conditions and the following disclaimer
+ * in the documentation and/or other materials provided with the
+ * distribution.
+ *     * Neither the name of Google Inc. nor the names of its
+ * contributors may be used to endorse or promote products derived from
+ * this software without specific prior written permission.
+ *
+ * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
+ * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
+ * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
+ * A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
+ * OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
+ * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
+ * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
+ * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
+ * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
+ * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
+ * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
+ */
+
+#ifndef WebContentDecryptionModuleSession_h
+#define WebContentDecryptionModuleSession_h
+
+namespace WebKit {
+
+class WebString;
+class WebURL;
+
+class WebContentDecryptionModuleSession {
+public:
+    class Client {
+    public:
+        enum MediaKeyErrorCode {
+            MediaKeyErrorCodeUnknown = 1,
+            MediaKeyErrorCodeClient,
+        };
+
+        virtual void keyAdded() = 0;
+        virtual void keyError(MediaKeyErrorCode, unsigned long systemCode) = 0;
+        virtual void keyMessage(const unsigned char* message, size_t messageLength, const WebKit::WebURL& destinationURL) = 0;
+
+    protected:
+        virtual ~Client() { }
+    };
+
+    virtual ~WebContentDecryptionModuleSession() { }
+
+    virtual const WebString& sessionId() const = 0;

[abarth-chromium, 2013/06/13 00:15:45]

Are you sure you want to return the WebString by const & ?  That implies that
the impl has to retain the object...  Might be better to just return WebString.

[ddorwin, 2013/06/13 00:24:13]

Done.

+    virtual void generateKeyRequest(const WebString& mimeType, const unsigned char* initData, size_t initDataLength) = 0;
+    virtual void update(const unsigned char* key, size_t keyLength) = 0;
+    virtual void close() = 0;
+};
+
+} // namespace WebKit
+
+#endif // WebContentDecryptionModuleSession_h