Fix the full screen switching browser window dipping below launcher bar issue.

ash/wm/base_layout_manager.h

Index: ash/wm/base_layout_manager.h
diff --git a/ash/wm/base_layout_manager.h b/ash/wm/base_layout_manager.h
index 624874bdc62108377274aaea4060c59112cee241..69b80adabaed27150ec56327b2c9ab46368a84d2 100644
--- a/ash/wm/base_layout_manager.h
+++ b/ash/wm/base_layout_manager.h
@@ -50,6 +50,9 @@ class ASH_EXPORT BaseLayoutManager : public aura::LayoutManager,
   // RootWindowObserver overrides:
   virtual void OnRootWindowResized(const gfx::Size& new_size) OVERRIDE;
 
+  // RootWindowObserver overrides:
+  virtual void OnScreenWorkAreaInsetsChanged() OVERRIDE;
+
   // WindowObserver overrides:
   virtual void OnWindowPropertyChanged(aura::Window* window,
                                        const void* key,
@@ -59,6 +62,10 @@ class ASH_EXPORT BaseLayoutManager : public aura::LayoutManager,
   // Update window bounds based on a change in show state.
   void UpdateBoundsFromShowState(aura::Window* window);
 
+  // Adjusts the window sizes when the screen changes its size or its
+  // work_area_insets_.
+  void AdjustWindowSizesForScreenChange();
+
   // Set of windows we're listening to.
   WindowSet windows_;