mojo: Add DataURLFetcher for processing data: urls.

mojo/package_manager/package_manager_impl.cc

 // Copyright 2015 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 "mojo/package_manager/package_manager_impl.h"
 
 #include "mojo/fetcher/about_fetcher.h"
+#include "mojo/fetcher/data_fetcher.h"
 #include "mojo/fetcher/local_fetcher.h"
 #include "mojo/fetcher/network_fetcher.h"
 #include "mojo/fetcher/switches.h"
 #include "mojo/fetcher/update_fetcher.h"
 #include "mojo/shell/application_manager.h"
 #include "mojo/shell/query_util.h"
 #include "mojo/shell/switches.h"
 #include "mojo/util/filename_util.h"
 #include "url/gurl.h"
 
@@ skipping 42 matching lines @@
 
 void PackageManagerImpl::FetchRequest(
     URLRequestPtr request,
     const shell::Fetcher::FetchCallback& loader_callback) {
   GURL url(request->url);
   if (url.SchemeIs(fetcher::AboutFetcher::kAboutScheme)) {
     fetcher::AboutFetcher::Start(url, loader_callback);
     return;
   }
 
+  if (url.SchemeIs(url::kDataScheme)) {
+    fetcher::DataFetcher::Start(url, loader_callback);
+    return;
+  }
+
   GURL resolved_url = ResolveURL(url);
 
   if (resolved_url.SchemeIsFile()) {
     // LocalFetcher uses the network service to infer MIME types from URLs.
     // Skip this for mojo URLs to avoid recursively loading the network service.
     if (!network_service_ && !url.SchemeIs("mojo")) {
       application_manager_->ConnectToService(GURL("mojo:network_service"),
                                             &network_service_);
     }
     // Ownership of this object is transferred to |loader_callback|.
@@ skipping 83 matching lines @@
                                       : std::string();
     *content_handler_url = alias_iter->second.first;
     return true;
   }
 
   return false;
 }
 
 }  // namespace package_manager
 }  // namespace mojo