[LogoTracker] Correct fingerprint append in async parameter.

components/search_provider_logos/google_logo_api.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 "components/search_provider_logos/google_logo_api.h"
 
 #include "base/base64.h"
 #include "base/json/json_reader.h"
 #include "base/memory/ref_counted_memory.h"
 #include "base/strings/string_util.h"
 #include "base/values.h"
 
 namespace search_provider_logos {
 
 namespace {
 const char kResponsePreamble[] = ")]}'";
 }
 
-GURL GoogleAppendFingerprintToLogoURL(const GURL& logo_url,
-                                      const std::string& fingerprint) {
+GURL GoogleAppendQueryparamsToLogoURL(const GURL& logo_url,
+                                      const std::string& fingerprint,
+                                      bool wants_cta) {
   // Note: we can't just use net::AppendQueryParameter() because it escapes
   // ":" to "%3A", but the server requires the colon not to be escaped.
   // See: http://crbug.com/413845
 
   // TODO(newt): Switch to using net::AppendQueryParameter once it no longer
   // escapes ":"
+  if (!fingerprint.empty() || wants_cta) {
+    std::string query(logo_url.query());
+    if (!query.empty())
+      query += "&";
 
-  std::string query(logo_url.query());
-  if (!query.empty())
-    query += "&";
+    query += "async=";
+    if (!fingerprint.empty()) {
+      query += "es_dfp:" + fingerprint + ",";
+    }
+    if (wants_cta) {
+      query += "cta:1";
+    }
+    GURL::Replacements replacements;
+    replacements.SetQueryStr(query);
+    return logo_url.ReplaceComponents(replacements);
+  }
 
-  query += "async=es_dfp:";
-  query += fingerprint;
-  GURL::Replacements replacements;
-  replacements.SetQueryStr(query);
-  return logo_url.ReplaceComponents(replacements);
+  return logo_url;
 }
 
 scoped_ptr<EncodedLogo> GoogleParseLogoResponse(
     const scoped_ptr<std::string>& response,
     base::Time response_time) {
   // Google doodles are sent as JSON with a prefix. Example:
   //   )]}' {"update":{"logo":{
   //     "data": "/9j/4QAYRXhpZgAASUkqAAgAAAAAAAAAAAAAAP/...",
   //     "mime_type": "image/png",
   //     "fingerprint": "db063e32",
@@ skipping 56 matching lines @@
   } else {
     time_to_live = base::TimeDelta::FromMilliseconds(kMaxTimeToLiveMS);
     logo->metadata.can_show_after_expiration = true;
   }
   logo->metadata.expiration_time = response_time + time_to_live;
 
   return logo.Pass();
 }
 
 }  // namespace search_provider_logos