Allow platform apps to specify a maximum size for the shell container.

ui/views/widget/native_widget_delegate.h

Index: ui/views/widget/native_widget_delegate.h
diff --git a/ui/views/widget/native_widget_delegate.h b/ui/views/widget/native_widget_delegate.h
index 6bbef31bff91016bc375163eae78aa1dfe23c7e4..4fac0b0d2db40c4e8e75236b92ff6166e9457149 100644
--- a/ui/views/widget/native_widget_delegate.h
+++ b/ui/views/widget/native_widget_delegate.h
@@ -69,6 +69,9 @@ class VIEWS_EXPORT NativeWidgetDelegate {
   // Returns the smallest size the window can be resized to by the user.
   virtual gfx::Size GetMinimumSize() = 0;
 
+  // Returns the largest size the window can be resized to by the user.
+  virtual gfx::Size GetMaximumSize() = 0;
+
   // Called when the NativeWidget changed size to |new_size|.
   virtual void OnNativeWidgetSizeChanged(const gfx::Size& new_size) = 0;