Basic windowless plugins, try 2.

webkit/glue/webplugin_impl.cc

Index: webkit/glue/webplugin_impl.cc
diff --git a/webkit/glue/webplugin_impl.cc b/webkit/glue/webplugin_impl.cc
index 09b69745d9825b74c4ab06a69a4dc354591317ce..5027d5ad39ffb4d8cb289a9e5e144f5630389f12 100644
--- a/webkit/glue/webplugin_impl.cc
+++ b/webkit/glue/webplugin_impl.cc
@@ -718,15 +718,12 @@ void WebPluginImpl::paint(WebCore::GraphicsContext* gc,
   gc->translate(static_cast<float>(origin.x()),
                 static_cast<float>(origin.y()));
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_LINUX)
   // Note that |context| is only used when in windowless mode.
   gfx::NativeDrawingContext context =
       gc->platformContext()->canvas()->beginPlatformPaint();
-#elif defined (OS_MACOSX)
+#elif defined(OS_MACOSX)
   gfx::NativeDrawingContext context = gc->platformContext();
-#else
-  // TODO(port): the equivalent of the above.
-  void* context = NULL;  // Temporary, to reduce ifdefs.
 #endif
 
   WebCore::IntRect window_rect =
@@ -735,7 +732,7 @@ void WebPluginImpl::paint(WebCore::GraphicsContext* gc,
 
   delegate_->Paint(context, webkit_glue::FromIntRect(window_rect));
 
-#if defined(OS_WIN)
+#if defined(OS_WIN) || defined(OS_LINUX)
   gc->platformContext()->canvas()->endPlatformPaint();
 #endif
   gc->restore();