[GPU] Get GPU process running on the mac...

webkit/glue/webplugin.h

 // Copyright (c) 2006-2009 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.
 
 #ifndef WEBKIT_GLUE_WEBPLUGIN_H_
 #define WEBKIT_GLUE_WEBPLUGIN_H_
 
 #include <string>
 #include <vector>
 
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 // Describes the new location for a plugin window.
 struct WebPluginGeometry {
   WebPluginGeometry();
 
   bool Equals(const WebPluginGeometry& rhs) const;
 
   // On Windows, this is the plugin window in the plugin process.
   // On X11, this is the XID of the plugin-side GtkPlug containing the
   // GtkSocket hosting the actual plugin window.
+  //
+  // On Mac OS X, all of the plugin types are currently "windowless"
+  // (window == 0) except for the special case of the GPU plugin,
+  // which currently performs rendering on behalf of the Pepper 3D API
+  // and WebGL. The GPU plugin uses a simple integer for the
+  // PluginWindowHandle which is used to map to a side data structure
+  // containing information about the plugin. Soon this plugin will be
+  // generalized, at which point this mechanism will be rethought or
+  // removed.
   gfx::PluginWindowHandle window;
   gfx::Rect window_rect;
   // Clip rect (include) and cutouts (excludes), relative to
   // window_rect origin.
   gfx::Rect clip_rect;
   std::vector<gfx::Rect> cutout_rects;
   bool rects_valid;
   bool visible;
 };
 
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   virtual void DidReceiveData(const char* buffer, int length,
                               int data_offset) = 0;
   virtual void DidFinishLoading() = 0;
   virtual void DidFail() = 0;
   virtual bool IsMultiByteResponseExpected() = 0;
 };
 
 }  // namespace webkit_glue
 
 #endif  // #ifndef WEBKIT_GLUE_WEBPLUGIN_H_