Adds the concept of a 'safe mode' hotkey start

chrome/installer/util/shell_util.h

Index: chrome/installer/util/shell_util.h
===================================================================
--- chrome/installer/util/shell_util.h	(revision 232633)
+++ chrome/installer/util/shell_util.h	(working copy)
@@ -78,11 +78,12 @@
       PROPERTIES_APP_ID = 1 << 4,
       PROPERTIES_SHORTCUT_NAME = 1 << 5,
       PROPERTIES_DUAL_MODE = 1 << 6,
+      PROPERTIES_HOTKEY = 1 << 7,
     };
 
     explicit ShortcutProperties(ShellChange level_in)
         : level(level_in), icon_index(0), dual_mode(false),
-          pin_to_taskbar(false), options(0U) {}
+          pin_to_taskbar(false), hotkey(0), options(0U) {}
 
     // Sets the target executable to launch from this shortcut.
     // This is mandatory when creating a shortcut.
@@ -150,6 +151,11 @@
       pin_to_taskbar = pin_to_taskbar_in;
     }
 
+    void set_hotkey(int hotkey_in) {
+      hotkey = hotkey_in;
+      options |= PROPERTIES_HOTKEY;
+    }
+
     bool has_target() const {
       return (options & PROPERTIES_TARGET) != 0;
     }
@@ -178,6 +184,9 @@
       return (options & PROPERTIES_DUAL_MODE) != 0;
     }
 
+    bool has_hotkey() const {
+      return (options & PROPERTIES_HOTKEY) != 0;
+    }
     // The level to install this shortcut at (CURRENT_USER for a per-user
     // shortcut and SYSTEM_LEVEL for an all-users shortcut).
     ShellChange level;
@@ -191,6 +200,7 @@
     string16 shortcut_name;
     bool dual_mode;
     bool pin_to_taskbar;
+    int hotkey;
     // Bitfield made of IndividualProperties. Properties set in |options| will
     // be used to create/update the shortcut, others will be ignored on update
     // and possibly replaced by default values on create (see individual