Set default page scale limits in layout test preferences

content/shell/common/webkit_test_helpers.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 "content/shell/common/webkit_test_helpers.h"
 
 #include "base/command_line.h"
 #include "base/files/file_util.h"
 #include "base/path_service.h"
 #include "base/strings/string_split.h"
@@ skipping 92 matching lines @@
   prefs->asynchronous_spell_checking_enabled = false;
   prefs->accelerated_2d_canvas_enabled =
       command_line.HasSwitch(switches::kEnableAccelerated2DCanvas);
   prefs->mock_scrollbars_enabled = false;
   prefs->smart_insert_delete_enabled = true;
   prefs->minimum_accelerated_2d_canvas_size = 0;
 #if defined(OS_ANDROID)
   prefs->text_autosizing_enabled = false;
 #endif
   prefs->viewport_enabled = false;
+  prefs->default_minimum_page_scale_factor = 1.f;
+  prefs->default_maximum_page_scale_factor = 4.f;
 }
 
 base::FilePath GetWebKitRootDirFilePath() {
   base::FilePath base_path;
   PathService::Get(base::DIR_SOURCE_ROOT, &base_path);
   return base_path.Append(FILE_PATH_LITERAL("third_party/WebKit"));
 }
 
 std::vector<std::string> GetSideloadFontFiles() {
   std::vector<std::string> files;
   const base::CommandLine& command_line =
       *base::CommandLine::ForCurrentProcess();
   if (command_line.HasSwitch(switches::kRegisterFontFiles)) {
     base::SplitString(
         command_line.GetSwitchValueASCII(switches::kRegisterFontFiles),
         ';',
         &files);
   }
   return files;
 }
 
 }  // namespace content