Add a PartialPreReadImage function to file_util (on Windows).

chrome_frame/chrome_frame.gyp

 # 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.
 
 {
   'variables': {
     'chromium_code': 1,
 
     'variables': {
       'version_py_path': '../tools/build/version.py',
@@ skipping 284 matching lines @@
       'target_name': 'chrome_frame_perftests',
       'type': 'executable',
       'dependencies': [
         '../base/base.gyp:base',
         '../base/base.gyp:base_i18n',
         '../base/base.gyp:test_support_base',
         '../build/temp_gyp/googleurl.gyp:googleurl',
         '../chrome/chrome.gyp:common',
         '../chrome/chrome.gyp:browser',
         '../chrome/chrome.gyp:debugger',
+        '../chrome/chrome.gyp:image_pre_reader',
         '../chrome/chrome.gyp:test_support_ui',
         '../chrome/chrome.gyp:utility',
         '../content/content.gyp:content_gpu',
         '../testing/gmock.gyp:gmock',
         '../testing/gtest.gyp:gtest',
         '../third_party/libxml/libxml.gyp:libxml',
         '../third_party/libxslt/libxslt.gyp:libxslt',
         'chrome_frame_ie',
         'chrome_frame_strings',
         'chrome_frame_utils',
@@ skipping 729 matching lines @@
               # Use outputs of this action as inputs for the main target build.
               # Seems as a misnomer but makes this happy on Linux (scons).
               'process_outputs_as_sources': 1,
             },
           ],
         },
       ],
     }, ],  # 'coverage!=0'
   ],  # 'conditions'
 }