Compute ResourceResponse::suggestedFileName on the fly.

third_party/WebKit/Source/platform/network/NetworkUtils.cpp

 // Copyright 2016 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 "platform/network/NetworkUtils.h"
 
+#include "base/strings/string16.h"
+#include "net/base/filename_util.h"
 #include "net/base/ip_address.h"
 #include "net/base/registry_controlled_domains/registry_controlled_domain.h"
 #include "net/base/url_util.h"
+#include "public/platform/URLConversion.h"
+#include "public/platform/WebString.h"
+#include "url/gurl.h"
 #include "wtf/text/StringUTF8Adaptor.h"
 #include "wtf/text/WTFString.h"
 
 namespace {
 
 net::registry_controlled_domains::PrivateRegistryFilter
 getNetPrivateRegistryFilter(blink::NetworkUtils::PrivateRegistryFilter filter) {
   switch (filter) {
     case blink::NetworkUtils::IncludePrivateRegistries:
       return net::registry_controlled_domains::INCLUDE_PRIVATE_REGISTRIES;
@@ skipping 26 matching lines @@
   return net::IsLocalHostname(utf8.asStringPiece(), isLocal6);
 }
 
 String getDomainAndRegistry(const String& host, PrivateRegistryFilter filter) {
   StringUTF8Adaptor hostUtf8(host);
   std::string domain = net::registry_controlled_domains::GetDomainAndRegistry(
       hostUtf8.asStringPiece(), getNetPrivateRegistryFilter(filter));
   return String(domain.data(), domain.length());
 }
 
+String getSuggestedFilename(const KURL& url, const String& contentDisposition) {
+  // TODO(jungshik): Thread in the actual value of the referrer charset and pass
+  // it to GetSuggestedFilename.
+  CString disposition = contentDisposition.utf8();
+  base::string16 filename = net::GetSuggestedFilename(
+      WebStringToGURL(WebString(url.getString())),
+      std::string(disposition.data(), disposition.length()),
+      std::string(),   // referrer_charset
+      std::string(),   // suggested_name
+      std::string(),   // mime_type
+      std::string());  // default_name
+  return String(filename.data(), filename.length());
+}
+
 }  // NetworkUtils
 
 }  // namespace blink