Introduce String::fromUTF8Lenient() and use it for cache_name in CacheStorage API.

third_party/WebKit/public/platform/WebString.h

 /*
  * Copyright (C) 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
@@ skipping 77 matching lines @@
     BLINK_COMMON_EXPORT std::string utf8() const;
 
     BLINK_COMMON_EXPORT static WebString fromUTF8(const char* data, size_t length);
     BLINK_COMMON_EXPORT static WebString fromUTF8(const char* data);
 
     static WebString fromUTF8(const std::string& s)
     {
         return fromUTF8(s.data(), s.length());
     }
 
+    BLINK_COMMON_EXPORT static WebString fromUTF8Lenient(const char* data, size_t length);
+
+    static WebString fromUTF8Lenient(const std::string& s)
+    {
+        return fromUTF8Lenient(s.data(), s.length());
+    }
+
     BLINK_COMMON_EXPORT std::string latin1() const;
 
     BLINK_COMMON_EXPORT static WebString fromLatin1(const WebLChar* data, size_t length);
 
     static WebString fromLatin1(const std::string& s)
     {
         return fromLatin1(reinterpret_cast<const WebLChar*>(s.data()), s.length());
     }
 
     template <int N> WebString(const char (&data)[N])
@@ skipping 91 matching lines @@
 }
 
 inline bool operator!=(const WebString& a, const WebString& b)
 {
     return !(a == b);
 }
 
 } // namespace blink
 
 #endif