desktop linux aura: Fix event/capture focus after dragging a window.

ui/aura/root_window_host_delegate.h

Index: ui/aura/root_window_host_delegate.h
diff --git a/ui/aura/root_window_host_delegate.h b/ui/aura/root_window_host_delegate.h
index 907de9b525a0d76874d2c973d6efcc690d571dc5..7ca3dd7a0434764b4525d360a60ed0915eeab146 100644
--- a/ui/aura/root_window_host_delegate.h
+++ b/ui/aura/root_window_host_delegate.h
@@ -32,7 +32,12 @@ class AURA_EXPORT RootWindowHostDelegate {
   virtual bool OnHostScrollEvent(ui::ScrollEvent* event) = 0;
   virtual bool OnHostTouchEvent(ui::TouchEvent* event) = 0;
 
-  virtual void OnHostLostCapture() = 0;
+  // Called when system focus is changed to another window.
+  virtual void OnHostLostWindowCapture() = 0;
+
+  // Called when the windowing system has mouse grab because it's performing a
+  // window move on our behalf, but we should still paint as if we're active.
+  virtual void OnHostLostMouseGrab() = 0;
 
   virtual void OnHostPaint() = 0;