Layout panels on top of their launcher icons

ash/launcher/launcher_view.cc

Index: ash/launcher/launcher_view.cc
diff --git a/ash/launcher/launcher_view.cc b/ash/launcher/launcher_view.cc
index f844b7ed87658bc4dd270de6ec7ca4b4de6bfad5..8aa94f325557ef3ff68823dab1c7606dc7d881b5 100644
--- a/ash/launcher/launcher_view.cc
+++ b/ash/launcher/launcher_view.cc
@@ -6,6 +6,7 @@
 
 #include "ash/launcher/launcher_button.h"
 #include "ash/launcher/launcher_delegate.h"
+#include "ash/launcher/launcher_icon_observer.h"
 #include "ash/launcher/launcher_model.h"
 #include "ash/launcher/tabbed_launcher_button.h"
 #include "ash/shell.h"
@@ -347,6 +348,8 @@ void LauncherView::LayoutToIdealBounds() {
   CalculateIdealBounds(&ideal_bounds);
   views::ViewModelUtils::SetViewBoundsToIdealBounds(*view_model_);
   overflow_button_->SetBoundsRect(ideal_bounds.overflow_bounds);
+  FOR_EACH_OBSERVER(LauncherIconObserver, observers_,
+                    OnLauncherIconPositionsChanged());
 }
 
 void LauncherView::CalculateIdealBounds(IdealBounds* bounds) {
@@ -404,6 +407,14 @@ int LauncherView::DetermineLastVisibleIndex(int max_x) {
   return index;
 }
 
+void LauncherView::AddIconObserver(LauncherIconObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void LauncherView::RemoveIconObserver(LauncherIconObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
 void LauncherView::AnimateToIdealBounds() {
   IdealBounds ideal_bounds;
   CalculateIdealBounds(&ideal_bounds);
@@ -412,6 +423,8 @@ void LauncherView::AnimateToIdealBounds() {
                                     view_model_->ideal_bounds(i));
   }
   overflow_button_->SetBoundsRect(ideal_bounds.overflow_bounds);
+  FOR_EACH_OBSERVER(LauncherIconObserver, observers_,
+                    OnLauncherIconPositionsChanged());
 }
 
 views::View* LauncherView::CreateViewForItem(const LauncherItem& item) {