Basic windowless plugins, try 2.

skia/ext/platform_device_linux.h

Index: skia/ext/platform_device_linux.h
diff --git a/skia/ext/platform_device_linux.h b/skia/ext/platform_device_linux.h
index 5c16c08ac631bec0507aefd2033cc5ba2de5499e..eae8965dd88bcc11044f32c2071b9353ed4a6251 100644
--- a/skia/ext/platform_device_linux.h
+++ b/skia/ext/platform_device_linux.h
@@ -7,6 +7,8 @@
 
 #include "SkDevice.h"
 
+typedef struct _cairo_surface cairo_surface_t;
+
 namespace skia {
 
 // Blindly copying the mac hierarchy.
@@ -15,6 +17,8 @@ class PlatformDeviceLinux : public SkDevice {
   // Returns if the preferred rendering engine is vectorial or bitmap based.
   virtual bool IsVectorial() = 0;
 
+  virtual cairo_surface_t* beginPlatformPaint() = 0;
+
  protected:
   // Forwards |bitmap| to SkDevice's constructor.
   PlatformDeviceLinux(const SkBitmap& bitmap);