Animate window control changes in TouchView

ash/frame/custom_frame_view_ash.cc

Index: ash/frame/custom_frame_view_ash.cc
diff --git a/ash/frame/custom_frame_view_ash.cc b/ash/frame/custom_frame_view_ash.cc
index 8ab7e23be865b2ec1d9ec47dc7bcd44872aaf143..113983735927187cc4549668f45761a8b5976b72 100644
--- a/ash/frame/custom_frame_view_ash.cc
+++ b/ash/frame/custom_frame_view_ash.cc
@@ -4,6 +4,9 @@
 
 #include "ash/frame/custom_frame_view_ash.h"
 
+#include <algorithm>
+#include <vector>
+
 #include "ash/ash_switches.h"
 #include "ash/frame/caption_buttons/frame_caption_button_container_view.h"
 #include "ash/frame/caption_buttons/frame_maximize_button.h"
@@ -154,6 +157,7 @@ class CustomFrameViewAsh::HeaderView
   // views::View:
   virtual void Layout() OVERRIDE;
   virtual void OnPaint(gfx::Canvas* canvas) OVERRIDE;
+  virtual void ChildPreferredSizeChanged(views::View* child) OVERRIDE;
 
   // ShellObserver:
   virtual void OnMaximizeModeStarted() OVERRIDE;
@@ -308,6 +312,17 @@ void CustomFrameViewAsh::HeaderView::OnPaint(gfx::Canvas* canvas) {
   header_painter_->PaintHeader(canvas, header_mode);
 }
 
+void CustomFrameViewAsh::HeaderView::
+    ChildPreferredSizeChanged(views::View* child) {
+  // FrameCaptionButtonContainerView animates the visibility changes in
+  // UpdateSizeButtonVisibility(false). Due to this a new size is not available
+  // until the completion of the animation. Layout it response to the preferred
+  // size changes.
+  if (child != caption_button_container_)
+    return;
+  parent()->Layout();
+}
+
 ///////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh::HeaderView, ShellObserver overrides: