Fix shelf layout when switching from left-aligned shelf to right-aligned shelf

ash/common/system/tray/tray_background_view.h

Index: ash/common/system/tray/tray_background_view.h
diff --git a/ash/common/system/tray/tray_background_view.h b/ash/common/system/tray/tray_background_view.h
index 478e427bda77e0b79719747d9decd52ee0a0e6a2..316fb7fc15ffacd2623d46159610ab585828c348 100644
--- a/ash/common/system/tray/tray_background_view.h
+++ b/ash/common/system/tray/tray_background_view.h
@@ -15,6 +15,10 @@
 #include "ui/compositor/layer_animation_observer.h"
 #include "ui/views/bubble/tray_bubble_view.h"
 
+namespace gfx {
+class Insets;
+}
+
 namespace ash {
 class ShelfLayoutManager;
 class TrayEventFilter;
@@ -66,7 +70,7 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   ~TrayBackgroundView() override;
 
   // Called after the tray has been added to the widget containing it.

[tdanderson, 2016/06/29 17:46:19]

Please add to this comment to explain what |insets| is.

[yiyix, 2016/06/29 18:56:39]

Done.

-  virtual void Initialize();
+  virtual void Initialize(const gfx::Insets& insets);
 
   // Initializes animations for the bubble.
   static void InitializeBubbleAnimations(views::Widget* bubble_widget);
@@ -87,7 +91,8 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   void UpdateBackground(int alpha) override;
 
   // Called whenever the shelf alignment changes.

[tdanderson, 2016/06/29 17:46:19]

Please add to this comment to explain |insets|

[yiyix, 2016/06/29 18:56:39]

Done.

-  virtual void SetShelfAlignment(ShelfAlignment alignment);
+  virtual void SetShelfAlignment(ShelfAlignment alignment,
+                                 const gfx::Insets& insets);
 
   // Called when the anchor (tray or bubble) may have moved or changed.
   virtual void AnchorUpdated() {}
@@ -139,8 +144,8 @@ class ASH_EXPORT TrayBackgroundView : public ActionableView,
   class TrayWidgetObserver;
 
   // Called from Initialize after all status area trays have been created.
-  // Sets the border based on the position of the view.
-  void SetTrayBorder();
+  // Sets the border based on given |insets|.
+  void SetTrayBorder(const gfx::Insets& insets);
 
   // ui::ImplicitAnimationObserver:
   void OnImplicitAnimationsCompleted() override;