Reduce the fullscreen window height by 1px on activation loss.

ui/views/win/hwnd_message_handler_delegate.h

Index: ui/views/win/hwnd_message_handler_delegate.h
diff --git a/ui/views/win/hwnd_message_handler_delegate.h b/ui/views/win/hwnd_message_handler_delegate.h
index 55ac4407197e71ba103f30f885150975acc33c45..d15809abc2b94aaf0e9b3a583acb8d9bb1dda646 100644
--- a/ui/views/win/hwnd_message_handler_delegate.h
+++ b/ui/views/win/hwnd_message_handler_delegate.h
@@ -94,8 +94,11 @@ class VIEWS_EXPORT HWNDMessageHandlerDelegate {
   virtual void HandleAppDeactivated() = 0;
 
   // Called when the window was activated or deactivated. |active| reflects the
-  // new state.
-  virtual void HandleActivationChanged(bool active) = 0;
+  // new state. |window_gaining_or_losing_activation| is the window gaining or
+  // losing activation.
+  virtual void HandleActivationChanged(
+      bool active,
+      HWND window_gaining_or_losing_activation) = 0;
 
   // Called when a well known "app command" from the system was performed.
   // Returns true if the command was handled.