[Aura] Polish app list.

ui/aura_shell/shell_delegate.h

Index: ui/aura_shell/shell_delegate.h
diff --git a/ui/aura_shell/shell_delegate.h b/ui/aura_shell/shell_delegate.h
index 28eb602527e5d2d76b4c55254d3acc8c95955847..3771b1aa12ea4358e986793e9b8d7491a59d5b3e 100644
--- a/ui/aura_shell/shell_delegate.h
+++ b/ui/aura_shell/shell_delegate.h
@@ -9,6 +9,10 @@
 #include "base/callback.h"
 #include "ui/aura_shell/aura_shell_export.h"
 
+namespace gfx {
+class Rect;
+}
+
 namespace views {
 class Widget;
 }
@@ -35,7 +39,9 @@ class AURA_SHELL_EXPORT ShellDelegate {
 
   // Invoked to create app list widget. The Delegate calls the callback
   // when the widget is ready to show.
-  virtual void RequestAppListWidget(const SetWidgetCallback& callback) = 0;
+  virtual void RequestAppListWidget(
+      const gfx::Rect& bounds,
+      const SetWidgetCallback& callback) = 0;
 
   // Invoked when the user clicks on a window entry in the launcher.
   virtual void LauncherItemClicked(const LauncherItem& item) = 0;