Implement a request cache and disble retrieving a sub-region.

chrome/browser/spellchecker/spelling_service_client.cc

 // Copyright (c) 2012 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/spellchecker/spelling_service_client.h"
 
 #include "base/json/json_reader.h"
 #include "base/json/string_escape.h"
 #include "base/logging.h"
+#include "base/string_util.h"
 #include "base/stringprintf.h"
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "chrome/browser/prefs/pref_service.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/common/pref_names.h"
 #include "chrome/common/spellcheck_result.h"
 #include "content/public/browser/browser_thread.h"
 #include "content/public/common/url_fetcher.h"
 #include "net/base/load_flags.h"
@@ skipping 44 matching lines @@
     // Also, we convert the given text to a JSON string, i.e. quote all its
     // non-ASCII characters.
     UErrorCode error = U_ZERO_ERROR;
     char id[ULOC_LANG_CAPACITY + ULOC_SCRIPT_CAPACITY + ULOC_COUNTRY_CAPACITY];
     uloc_addLikelySubtags(locale.c_str(), id, arraysize(id), &error);
 
     error = U_ZERO_ERROR;
     uloc_getLanguage(id, language, arraysize(language), &error);
     country = uloc_getISO3Country(id);
   }
+  if (type == SPELLCHECK && base::strcasecmp(language, ULOC_ENGLISH))
+    return false;
 
   // Format the JSON request to be sent to the Spelling service.
   std::string encoded_text;
   base::JsonDoubleQuote(text, false, &encoded_text);
 
   static const char kSpellingRequest[] =
       "{"
       "\"method\":\"spelling.check\","
       "\"apiVersion\":\"v%d\","
       "\"params\":{"
@@ skipping 112 matching lines @@
     if (!suggestions->GetDictionary(0, &suggestion) ||
         !suggestion->GetString("suggestion", &replacement)) {
       return false;
     }
     SpellCheckResult result(
         SpellCheckResult::SPELLING, start, length, replacement);
     results->push_back(result);
   }
   return true;
 }