Add acknowledgement messages for PluginMsg_UpdateGeometry

chrome/plugin/webplugin_proxy.cc

 // 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.
 
 #include "chrome/plugin/webplugin_proxy.h"
 
 #include "build/build_config.h"
 
 #include "app/gfx/canvas.h"
 #if defined(OS_WIN)
@@ skipping 423 matching lines @@
   CGContextClipToRect(windowless_context_, rect.ToCGRect());
   delegate_->Paint(windowless_context_, rect);
   CGContextRestoreGState(windowless_context_);
 #endif
 }
 
 void WebPluginProxy::UpdateGeometry(
     const gfx::Rect& window_rect,
     const gfx::Rect& clip_rect,
     const TransportDIB::Handle& windowless_buffer,
-    const TransportDIB::Handle& background_buffer) {
+    const TransportDIB::Handle& background_buffer
+#if defined(OS_MACOSX)
+    ,
+    int ack_key
+#endif
+    ) {
   gfx::Rect old = delegate_->GetRect();
   gfx::Rect old_clip_rect = delegate_->GetClipRect();
 
   delegate_->UpdateGeometry(window_rect, clip_rect);
   if (TransportDIB::is_valid(windowless_buffer)) {
     // The plugin's rect changed, so now we have a new buffer to draw into.
     SetWindowlessBuffer(windowless_buffer, background_buffer);
   }
 
   // Send over any pending invalidates which occured when the plugin was
   // off screen.
   if (delegate_->IsWindowless() && !clip_rect.IsEmpty() &&
       old_clip_rect.IsEmpty() && !damaged_rect_.IsEmpty()) {
     InvalidateRect(damaged_rect_);
   }
+
+#if defined(OS_MACOSX)
+  // The renderer is expecting an ACK message if ack_key is not -1.
+  if (ack_key != -1) {
+    Send(new PluginHostMsg_UpdateGeometry_ACK(route_id_, ack_key));
+  }
+#endif
 }
 
 #if defined(OS_WIN)
 void WebPluginProxy::SetWindowlessBuffer(
     const TransportDIB::Handle& windowless_buffer,
     const TransportDIB::Handle& background_buffer) {
   // Create a canvas that will reference the shared bits. We have to handle
   // errors here since we're mapping a large amount of memory that may not fit
   // in our address space, or go wrong in some other way.
   windowless_canvas_.reset(new skia::PlatformCanvas);
@@ skipping 121 matching lines @@
   while (index != resource_clients_.end()) {
     WebPluginResourceClient* client = (*index).second;
 
     if (client == resource_client) {
       resource_clients_.erase(index++);
     } else {
       index++;
     }
   }
 }