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 281de089925abd2a21d2119b68ab61d4f4aaff11..b86f91a50221670a926894bbcbc33f2ba2eb2e26 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/web_applications/web_app.h"
 
+class Profile;
+
 namespace content {
 class WebContents;
 }
 
+namespace extensions {
+class Extension;
+}
+
 namespace gfx {
 class ImageFamily;
 }
@@ -23,6 +29,12 @@ namespace web_app {
 base::FilePath CreateShortcutInWebAppDir(const base::FilePath& web_app_path,
                                          const 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,