Add new MouseCursor interface for setting the mouse cursor.

ppapi/thunk/ppb_instance_api.h

Index: ppapi/thunk/ppb_instance_api.h
diff --git a/ppapi/thunk/ppb_instance_api.h b/ppapi/thunk/ppb_instance_api.h
index 3a357af289c4f474c2a535197ee41dbf465ce5bf..58f119f2fd33f5dda7ded13c7bcf458003223bc2 100644
--- a/ppapi/thunk/ppb_instance_api.h
+++ b/ppapi/thunk/ppb_instance_api.h
@@ -14,6 +14,7 @@
 #include "ppapi/c/ppb_audio_config.h"
 #include "ppapi/c/ppb_gamepad.h"
 #include "ppapi/c/ppb_instance.h"
+#include "ppapi/c/ppb_mouse_cursor.h"
 #include "ppapi/c/private/ppb_instance_private.h"
 #include "ppapi/shared_impl/api_id.h"
 
@@ -99,6 +100,12 @@ class PPB_Instance_FunctionAPI {
   // Messaging.
   virtual void PostMessage(PP_Instance instance, PP_Var message) = 0;
 
+  // Mouse cursor.
+  virtual PP_Bool SetCursor(PP_Instance instance,
+                            PP_MouseCursor_Type type,
+                            PP_Resource image,
+                            const PP_Point* hot_spot) = 0;
+
   // MouseLock.
   virtual int32_t LockMouse(PP_Instance instance,
                             PP_CompletionCallback callback) = 0;