Basic windowless plugins, try 2.

webkit/glue/plugins/webplugin_delegate_impl.h

 // Copyright (c) 2006-2008 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_PLUGIN_WEBPLUGIN_DELEGATE_IMPL_H_
 #define WEBKIT_GLUE_PLUGIN_WEBPLUGIN_DELEGATE_IMPL_H_
 
 #include "build/build_config.h"
 
 #include <string>
 #include <list>
 
 #include "base/file_path.h"
 #include "base/gfx/native_widget_types.h"
 #include "base/gfx/rect.h"
 #include "base/ref_counted.h"
 #include "base/task.h"
 #include "third_party/npapi/bindings/npapi.h"
 #include "webkit/glue/webplugin_delegate.h"
 #include "webkit/glue/webcursor.h"
 
+#if defined(OS_LINUX)
+typedef struct _GdkDrawable GdkPixmap;
+#endif
+
 namespace NPAPI {
   class PluginInstance;
 };
 
 // An implementation of WebPluginDelegate that proxies all calls to
 // the plugin process.
 class WebPluginDelegateImpl : public WebPluginDelegate {
  public:
   static bool IsPluginDelegateWindow(gfx::NativeWindow window);
   static bool GetPluginNameFromWindow(gfx::NativeWindow window,
@@ skipping 138 matching lines @@
 
 #if defined(OS_WIN)
   // Original wndproc before we subclassed.
   WNDPROC plugin_wnd_proc_;
 
   // Used to throttle WM_USER+1 messages in Flash.
   uint32 last_message_;
   bool is_calling_wndproc;
 #endif // OS_WIN
 
+#if defined(OS_LINUX)
+  // The pixmap we're drawing into, for a windowless plugin.
+  GdkPixmap* pixmap_;
+
+  // Ensure pixmap_ exists and is at least width by height pixels.
+  void EnsurePixmapAtLeastSize(int width, int height);
+#endif
+
   gfx::NativeView parent_;
   NPWindow window_;
 #if defined(OS_MACOSX)
   NP_CGContext cg_context_;
 #endif
   gfx::Rect window_rect_;
   gfx::Rect clip_rect_;
   std::vector<gfx::Rect> cutout_rects_;
   int quirks_;
 
@@ skipping 69 matching lines @@
 
   // Holds the current cursor set by the windowless plugin.
   WebCursor current_windowless_cursor_;
 
   friend class WebPluginDelegate;
 
   DISALLOW_EVIL_CONSTRUCTORS(WebPluginDelegateImpl);
 };
 
 #endif  // #ifndef WEBKIT_GLUE_PLUGIN_WEBPLUGIN_DELEGATE_IMPL_H_