Add default icon to app_host.exe, and use it in shortcuts during installation.

chrome/installer/util/shell_util.h

 // 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.
 //
 // This file declares methods that are useful for integrating Chrome in
 // Windows shell. These methods are all static and currently part of
 // ShellUtil class.
 
 #ifndef CHROME_INSTALLER_UTIL_SHELL_UTIL_H_
 #define CHROME_INSTALLER_UTIL_SHELL_UTIL_H_
@@ skipping 294 matching lines @@
   // SHELL_SHORTCUT_CREATE_ALWAYS).
   // |dist| gives the type of browser distribution currently in use.
   // |properties| and |operation| affect this method as described on their
   // invidividual definitions above.
   static bool CreateOrUpdateShortcut(
       ShellUtil::ShortcutLocation location,
       BrowserDistribution* dist,
       const ShellUtil::ShortcutProperties& properties,
       ShellUtil::ShortcutOperation operation);
 
-  // This method appends the Chrome icon index inside chrome.exe to the
-  // chrome.exe path passed in as input, to generate the full path for
-  // Chrome icon that can be used as value for Windows registry keys.
-  // |chrome_exe| full path to chrome.exe.
-  static string16 GetChromeIcon(BrowserDistribution* dist,
-                                const string16& chrome_exe);
+  // Combines |icon_path| with |icon_index| into a string that can be
+  // used as value for Windows registry keys.
+  static string16 GetIconString(const string16& icon_path,
+                                int icon_index);
 
   // This method returns the command to open URLs/files using chrome. Typically
   // this command is written to the registry under shell\open\command key.
   // |chrome_exe|: the full path to chrome.exe
   static string16 GetChromeShellOpenCmd(const string16& chrome_exe);
 
   // This method returns the command to be called by the DelegateExecute verb
   // handler to launch chrome on Windows 8. Typically this command is written to
   // the registry under the HKCR\Chrome\.exe\shell\(open|run)\command key.
   // |chrome_exe|: the full path to chrome.exe
@@ skipping 225 matching lines @@
   // required by the base32 standard for inputs that aren't a multiple of 5
   // bytes.
   static string16 ByteArrayToBase32(const uint8* bytes, size_t size);
 
  private:
   DISALLOW_COPY_AND_ASSIGN(ShellUtil);
 };
 
 
 #endif  // CHROME_INSTALLER_UTIL_SHELL_UTIL_H_