Support "Pin to taskbar" for hosted app windows.

chrome/browser/web_applications/web_app_win.h

Index: chrome/browser/web_applications/web_app_win.h
diff --git a/chrome/browser/web_applications/web_app_win.h b/chrome/browser/web_applications/web_app_win.h
index 4f4c5417dc170952680c0c809685fc6a359115bb..08b708f349090ec5b987daabff1bc13193ad557e 100644
--- a/chrome/browser/web_applications/web_app_win.h
+++ b/chrome/browser/web_applications/web_app_win.h
@@ -8,10 +8,16 @@
 #include "base/files/file_path.h"
 #include "chrome/browser/shell_integration.h"
 
+class Profile;
+
 namespace content {
 class WebContents;
 }
 
+namespace extensions {
+class Extension;
+}
+
 namespace gfx {
 class ImageFamily;
 }
@@ -24,6 +30,12 @@ base::FilePath CreateShortcutInWebAppDir(
     const base::FilePath& web_app_path,
     const ShellIntegration::ShortcutInfo& shortcut_info);
 
+// Update the relaunch details for the given app's window, making the taskbar
+// group's "Pin to the taskbar" button function correctly.
+void UpdateRelaunchDetailsForApp(Profile* profile,
+                                 const extensions::Extension* extension,
+                                 HWND hwnd);
+
 namespace internals {
 
 bool CheckAndSaveIcon(const base::FilePath& icon_file,