Fix the issue of app window frame header buttons not being repainted when its activation state chan…

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 c0f057c4f81e363bb7de6cff380aa962c8170d99..96468b4478e703c73cbc58d8a99d5f7604bf3113 100644
--- a/ash/frame/custom_frame_view_ash.cc
+++ b/ash/frame/custom_frame_view_ash.cc
@@ -516,6 +516,11 @@ void CustomFrameViewAsh::SizeConstraintsChanged() {
   header_view_->SizeConstraintsChanged();
 }
 
+void CustomFrameViewAsh::ActivationChanged(bool active) {
+  // The icons differ between active and inactive.
+  header_view_->SchedulePaint();
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // CustomFrameViewAsh, views::View overrides: