Make the cursor have separate mode for disabled mouse events and invisible.

ui/aura/client/cursor_client.h

Index: ui/aura/client/cursor_client.h
diff --git a/ui/aura/client/cursor_client.h b/ui/aura/client/cursor_client.h
index 3f970b0b5c3939eac14a2040a5f49af6d58d5efc..2b8abf9b2d842fdd24616395522d1288cb3d142e 100644
--- a/ui/aura/client/cursor_client.h
+++ b/ui/aura/client/cursor_client.h
@@ -18,12 +18,17 @@ class AURA_EXPORT CursorClient {
   // Notes that |window| has requested the change to |cursor|.
   virtual void SetCursor(gfx::NativeCursor cursor) = 0;
 
-  // Changes the visibility of the cursor.
+  // Changes the visibility of the cursor. Mouse events keep being sent even
+  // when the cursor is invisible,
   virtual void ShowCursor(bool show) = 0;
 
   // Gets whether the cursor is visible.
   virtual bool IsCursorVisible() const = 0;
 
+  // Enables or disables the cursor. When cursor is disabled, no mouse events
+  // are sent.
+  virtual void EnableCursor(bool enabled) = 0;
+
   // Sets the device scale factor of the cursor.
   virtual void SetDeviceScaleFactor(float device_scale_factor) = 0;