Add acknowledgement messages for PluginMsg_UpdateGeometry

chrome/common/plugin_messages.h

 // Copyright (c) 2009 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // Defines messages between the browser and plugin process, as well as between
 // the renderer and plugin process.
 //
 // See render_message* for information about the multi-pass include of headers.
 
 #ifndef CHROME_COMMON_PLUGIN_MESSAGES_H_
@@ skipping 87 matching lines @@
   std::string string_value;
   int npobject_routing_id;
   intptr_t npobject_pointer;
 };
 
 struct PluginMsg_UpdateGeometry_Param {
   gfx::Rect window_rect;
   gfx::Rect clip_rect;
   TransportDIB::Handle windowless_buffer;
   TransportDIB::Handle background_buffer;
+
+#if defined(OS_MACOSX)
+  // This field contains a key that the plug-in process is expected to return
+  // to the renderer in its ACK message, unless the value is -1, in which case
+  // no ACK message is required.  Other than the special -1 value, the values
+  // used in ack_key are opaque to the plug-in process.
+  int ack_key;
+#endif
 };
 
 
 namespace IPC {
 
 // Traits for PluginMsg_Init_Params structure to pack/unpack.
 template <>
 struct ParamTraits<PluginMsg_Init_Params> {
   typedef PluginMsg_Init_Params param_type;
   static void Write(Message* m, const param_type& p) {
@@ skipping 293 matching lines @@
 // for transparent windowless plugins, and holds the background of the plugin
 // rectangle.
 template <>
 struct ParamTraits<PluginMsg_UpdateGeometry_Param> {
   typedef PluginMsg_UpdateGeometry_Param param_type;
   static void Write(Message* m, const param_type& p) {
     WriteParam(m, p.window_rect);
     WriteParam(m, p.clip_rect);
     WriteParam(m, p.windowless_buffer);
     WriteParam(m, p.background_buffer);
+#if defined(OS_MACOSX)
+    WriteParam(m, p.ack_key);
+#endif
   }
   static bool Read(const Message* m, void** iter, param_type* r) {
     return
       ReadParam(m, iter, &r->window_rect) &&
       ReadParam(m, iter, &r->clip_rect) &&
       ReadParam(m, iter, &r->windowless_buffer) &&
-      ReadParam(m, iter, &r->background_buffer);
+      ReadParam(m, iter, &r->background_buffer)
+#if defined(OS_MACOSX)
+      &&
+      ReadParam(m, iter, &r->ack_key)
+#endif
+      ;
   }
   static void Log(const param_type& p, std::wstring* l) {
     l->append(L"(");
     LogParam(p.window_rect, l);
     l->append(L", ");
     LogParam(p.clip_rect, l);
     l->append(L", ");
     LogParam(p.windowless_buffer, l);
     l->append(L", ");
     LogParam(p.background_buffer, l);
+#if defined(OS_MACOSX)
+    l->append(L", ");
+    LogParam(p.ack_key, l);
+#endif
     l->append(L")");
   }
 };
 
 }  // namespace IPC
 
 
 #define MESSAGES_INTERNAL_FILE "chrome/common/plugin_messages_internal.h"
 #include "ipc/ipc_message_macros.h"
 
 #endif  // CHROME_COMMON_PLUGIN_MESSAGES_H_