Add a component updater for the CLD2 data file.

chrome/browser/component_updater/update_checker.cc

 // Copyright 2014 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 "chrome/browser/component_updater/update_checker.h"
 
 #include "base/compiler_specific.h"
+#include "base/logging.h"
 #include "base/strings/stringprintf.h"
 #include "chrome/browser/component_updater/component_updater_utils.h"
 #include "chrome/browser/component_updater/crx_update_item.h"
 #include "content/public/browser/browser_thread.h"
 #include "net/url_request/url_fetcher.h"
 #include "net/url_request/url_fetcher_delegate.h"
 #include "url/gurl.h"
 
 using content::BrowserThread;
 
@@ skipping 29 matching lines @@
     base::StringAppendF(&app, "<updatecheck />");
     if (!item->component.fingerprint.empty()) {
       base::StringAppendF(&app,
                           "<packages>"
                           "<package fp=\"%s\"/>"
                           "</packages>",
                           item->component.fingerprint.c_str());
     }
     base::StringAppendF(&app, "</app>");
     app_elements.append(app);
+    VLOG(1) << "Appending to update request: " << app;
   }
 
   return BuildProtocolRequest(app_elements, additional_attributes);
 }
 
 class UpdateCheckerImpl
     : public UpdateChecker,
       public net::URLFetcherDelegate {
  public:
   UpdateCheckerImpl(const GURL& url,
@@ skipping 66 matching lines @@
   int error = 0;
   std::string error_message;
   UpdateResponse update_response;
 
   if (FetchSuccess(*source)) {
     std::string xml;
     source->GetResponseAsString(&xml);
     if (!update_response.Parse(xml)) {
       error = -1;
       error_message = update_response.errors();
+      VLOG(1) << "Update request failed: " << error_message;
     }
   } else {
     error = GetFetchError(*source);
     error_message.assign("network error");
+    VLOG(1) << "Update request failed: network error";
   }
 
   url_fetcher_.reset();
   update_check_callback_.Run(error, error_message, update_response.results());
 }
 
 }  // namespace component_updater