Add fuzz testers to //net for some functions with simple parsing APIs.

net/base/data_url.cc

 // Copyright (c) 2012 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.
 
 // NOTE: based loosely on mozilla's nsDataChannel.cpp
 
 #include <algorithm>
 
 #include "net/base/data_url.h"
 
 #include "base/base64.h"
 #include "base/strings/string_split.h"
 #include "base/strings/string_util.h"
 #include "net/base/escape.h"
 #include "net/base/mime_util.h"
 #include "net/http/http_util.h"
 #include "url/gurl.h"
 
 namespace net {
 
 // static
 bool DataURL::Parse(const GURL& url, std::string* mime_type,
                     std::string* charset, std::string* data) {
+  if (!url.is_valid())
+    return false;
+
   DCHECK(mime_type->empty());
   DCHECK(charset->empty());
   std::string::const_iterator begin = url.spec().begin();
   std::string::const_iterator end = url.spec().end();
 
   std::string::const_iterator after_colon = std::find(begin, end, ':');
   if (after_colon == end)
     return false;
   ++after_colon;
 
@@ skipping 94 matching lines @@
       temp_data.resize(length + padding_needed, '=');
     }
     return base::Base64Decode(temp_data, data);
   }
 
   temp_data.swap(*data);
   return true;
 }
 
 }  // namespace net