Linux Skia: add an option to build a canvas from a provided memory buffer

skia/ext/bitmap_platform_device_linux.h

Index: skia/ext/bitmap_platform_device_linux.h
diff --git a/skia/ext/bitmap_platform_device_linux.h b/skia/ext/bitmap_platform_device_linux.h
index b4f0c1bcba8b8ef58066ae0d65c9b8e58edbbb6d..cfc72e20148aa0b4afc551f5d099df46fb732d05 100644
--- a/skia/ext/bitmap_platform_device_linux.h
+++ b/skia/ext/bitmap_platform_device_linux.h
@@ -62,6 +62,11 @@ class BitmapPlatformDeviceLinux : public PlatformDeviceLinux {
   /// Static constructor. I don't understand this, it's just a copy of the mac
   static BitmapPlatformDeviceLinux* Create(int width, int height,
                                            bool is_opaque);
+  static BitmapPlatformDeviceLinux* Create(int width, int height,
+                                           bool is_opaque, uint8_t* data);
+  static BitmapPlatformDeviceLinux* Create(int width, int height,
+                                           bool is_opaque,
+                                           cairo_surface_t* surface);
 
   // Create a BitmapPlatformDeviceLinux from an already constructed bitmap;
   // you should probably be using Create(). This may become private later if