Add setBounds method and browsertest for get/set bounds to app window API

chrome/browser/ui/extensions/shell_window.h

Index: chrome/browser/ui/extensions/shell_window.h
diff --git a/chrome/browser/ui/extensions/shell_window.h b/chrome/browser/ui/extensions/shell_window.h
index 231bb62388f8feb40293800993c783d88eb1307d..e2de50dea0c10783a0664f7e4a8be8b5dbf20373 100644
--- a/chrome/browser/ui/extensions/shell_window.h
+++ b/chrome/browser/ui/extensions/shell_window.h
@@ -106,6 +106,9 @@ class ShellWindow : public content::NotificationObserver,
   // Save the window position in the prefs.
   virtual void SaveWindowPosition();
 
+  // Sends an update message with the current bounds to the renderer.
+  void SendBoundsUpdate();
+
  protected:
   ShellWindow(Profile* profile,
               const extensions::Extension* extension);