(re-commit) Implement installation of the Chrome App Host.

chrome/installer/setup/install_worker.h

Index: chrome/installer/setup/install_worker.h
diff --git a/chrome/installer/setup/install_worker.h b/chrome/installer/setup/install_worker.h
index 3a32d720f4a69ec9412959d477eef508b9522b29..c112f8cd61bbf5a72de18245e34d5b52ef05963d 100644
--- a/chrome/installer/setup/install_worker.h
+++ b/chrome/installer/setup/install_worker.h
@@ -63,7 +63,6 @@ void AddUsageStatsWorkItems(const InstallationState& original_state,
 // false.
 bool AppendPostInstallTasks(const InstallerState& installer_state,
                             const FilePath& setup_path,
-                            const FilePath& new_chrome_exe,
                             const Version* current_version,
                             const Version& new_version,
                             const FilePath& temp_path,
@@ -182,11 +181,25 @@ void RefreshElevationPolicy();
 // run) and |new_version| (the version of the product(s) currently being
 // installed) are required when processing product installation; they are unused
 // (and may therefore be NULL) when uninstalling.
-void AddQuickEnableWorkItems(const InstallerState& installer_state,
-                             const InstallationState& machine_state,
-                             const FilePath* setup_path,
-                             const Version* new_version,
-                             WorkItemList* work_item_list);
+void AddQuickEnableChromeFrameWorkItems(const InstallerState& installer_state,
+                                        const InstallationState& machine_state,
+                                        const FilePath* setup_path,
+                                        const Version* new_version,
+                                        WorkItemList* work_item_list);
+
+// Add work items to add or remove the "quick-enable-application-host" command
+// to the multi-installer binaries' version key on the basis of the current
+// operation (represented in |installer_state|) and the pre-existing machine
+// configuration (represented in |machine_state|).  |setup_path| (the path to
+// the executable currently being run) and |new_version| (the version of the
+// product(s) currently being installed) are required when processing product
+// installation; they are unused (and may therefore be NULL) when uninstalling.
+void AddQuickEnableApplicationHostWorkItems(
+    const InstallerState& installer_state,
+    const InstallationState& machine_state,
+    const FilePath* setup_path,
+    const Version* new_version,
+    WorkItemList* work_item_list);
 
 }  // namespace installer