This CL adds client.toDataURL which gets the contents...

utils/cross/dataurl.h

Index: utils/cross/dataurl.h
===================================================================
--- utils/cross/dataurl.h	(revision 0)
+++ utils/cross/dataurl.h	(revision 0)
@@ -0,0 +1,52 @@
+/*
+ * Copyright 2009, 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.
+ */
+
+// This file contains the declaration of functions for dealing with data urls.
+
+#ifndef O3D_UTILS_CROSS_DATAURL_H_
+#define O3D_UTILS_CROSS_DATAURL_H_
+
+#include "core/cross/types.h"
+
+namespace o3d {
+namespace dataurl {
+
+// An empty data URL. ("data:,")
+extern const char* const kEmptyDataURL;
+
+// Creates a data URL for the given data.
+String ToDataURL(const String& mime_type, const void* data, size_t length);
+
+}  // namespace dataurl
+}  // namespace o3d
+
+#endif  // O3D_UTILS_CROSS_DATAURL_H_
+