Basic windowless plugins, try 2.

skia/ext/platform_canvas_linux.cc

Index: skia/ext/platform_canvas_linux.cc
diff --git a/skia/ext/platform_canvas_linux.cc b/skia/ext/platform_canvas_linux.cc
index 422693ca958496d134051231576733590137b030..a4e080ffa4a978b74ac1eeda0906bccba3c3eb4e 100644
--- a/skia/ext/platform_canvas_linux.cc
+++ b/skia/ext/platform_canvas_linux.cc
@@ -53,6 +53,10 @@ bool PlatformCanvasLinux::initialize(int width, int height, bool is_opaque,
   return true;
 }
 
+cairo_surface_t* PlatformCanvasLinux::beginPlatformPaint() {
+  return getTopPlatformDevice().beginPlatformPaint();
+}
+
 PlatformDeviceLinux& PlatformCanvasLinux::getTopPlatformDevice() const {
   // All of our devices should be our special PlatformDevice.
   SkCanvas::LayerIter iter(const_cast<PlatformCanvasLinux*>(this), false);