Change overview mode to so that docked panel windows are not grouped together.

ash/wm/panels/panel_layout_manager.cc

Index: ash/wm/panels/panel_layout_manager.cc
diff --git a/ash/wm/panels/panel_layout_manager.cc b/ash/wm/panels/panel_layout_manager.cc
index ccbf450f0c3d361c8c37461006e60a15a4099478..b9ee368bad6aa27445bb37c88d877840f54ca44a 100644
--- a/ash/wm/panels/panel_layout_manager.cc
+++ b/ash/wm/panels/panel_layout_manager.cc
@@ -15,6 +15,7 @@
 #include "ash/shelf/shelf_widget.h"
 #include "ash/shell.h"
 #include "ash/shell_window_ids.h"
+#include "ash/wm/overview/window_selector_controller.h"
 #include "ash/wm/window_animations.h"
 #include "ash/wm/window_state.h"
 #include "ash/wm/window_util.h"
@@ -263,7 +264,8 @@ PanelLayoutManager::PanelLayoutManager(aura::Window* panel_container)
       shelf_(NULL),
       shelf_layout_manager_(NULL),
       last_active_panel_(NULL),
-      weak_factory_(this) {
+      weak_factory_(this),
+      overview_mode_active_(false) {
   DCHECK(panel_container);
   aura::client::GetActivationClient(Shell::GetPrimaryRootWindow())->
       AddObserver(this);
@@ -464,6 +466,15 @@ void PanelLayoutManager::OnShelfIconPositionsChanged() {
 ////////////////////////////////////////////////////////////////////////////////
 // PanelLayoutManager, ash::ShellObserver implementation:
 
+void PanelLayoutManager::OnOverviewModeStarting() {
+  overview_mode_active_ = true;
+}
+
+void PanelLayoutManager::OnOverviewModeEnding() {
+  overview_mode_active_ = false;
+  Relayout();
+}
+
 void PanelLayoutManager::OnShelfAlignmentChanged(aura::Window* root_window) {
   if (panel_container_->GetRootWindow() == root_window)
     Relayout();
@@ -599,7 +610,12 @@ void PanelLayoutManager::Relayout() {
   if (!shelf_ || !shelf_->shelf_widget())
     return;
 
-  if (in_layout_)
+  // Suppress layouts during overview mode because changing window bounds
+  // interfered with overview mode animations. However, layouts need to be done
+  // when the WindowSelectorController is restoring minimized windows so that
+  // they actually become visible.
+  if (in_layout_ || (overview_mode_active_ && !Shell::GetInstance()->
+      window_selector_controller()->IsRestoringMinimizedWindows()))
     return;
   base::AutoReset<bool> auto_reset_in_layout(&in_layout_, true);