Support chrome-extension:// scheme in URLPattern.

chrome/browser/extensions/extension_tabs_module.cc

 // Copyright (c) 2011 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/extensions/extension_tabs_module.h"
 
 #include <algorithm>
 #include <vector>
 
 #include "base/base64.h"
@@ skipping 709 matching lines @@
   QueryArg pinned = ParseBoolQueryArg(query, keys::kPinnedKey);
   QueryArg selected = ParseBoolQueryArg(query, keys::kHighlightedKey);
 
   QueryArg loading = NOT_SET;
   if (query->HasKey(keys::kStatusKey)) {
     std::string status;
     EXTENSION_FUNCTION_VALIDATE(query->GetString(keys::kStatusKey, &status));
     loading = (status == keys::kStatusValueLoading) ? MATCH_TRUE : MATCH_FALSE;
   }
 
+  // It is o.k. to use URLPattern::SCHEME_ALL here because this function does
+  // not grant access to the content of the tabs, only to seeing their URLs and
+  // meta data.
   URLPattern url_pattern(URLPattern::SCHEME_ALL, "<all_urls>");
   if (query->HasKey(keys::kUrlKey)) {
     std::string value;
     EXTENSION_FUNCTION_VALIDATE(query->GetString(keys::kUrlKey, &value));
     url_pattern = URLPattern(URLPattern::SCHEME_ALL, value);
   }
 
   std::string title;
   if (query->HasKey(keys::kTitleKey))
     EXTENSION_FUNCTION_VALIDATE(
@@ skipping 875 matching lines @@
   // called for every API call the extension made.
   GotLanguage(language);
 }
 
 void DetectTabLanguageFunction::GotLanguage(const std::string& language) {
   result_.reset(Value::CreateStringValue(language.c_str()));
   SendResponse(true);
 
   Release();  // Balanced in Run()
 }