Use LANCZOS3 resize algorithm to generate missing image reps for extension action icons.

ui/gfx/image/image_skia_operations.h

Index: ui/gfx/image/image_skia_operations.h
diff --git a/ui/gfx/image/image_skia_operations.h b/ui/gfx/image/image_skia_operations.h
index 80326b6f2df1ef911eeae43e293c33b897deaec1..8cc394a1fadf63f9db026af8b70c5bba19d35010 100644
--- a/ui/gfx/image/image_skia_operations.h
+++ b/ui/gfx/image/image_skia_operations.h
@@ -83,6 +83,13 @@ class UI_EXPORT ImageSkiaOperations {
                                       skia::ImageOperations::ResizeMethod methd,
                                       const Size& target_dip_size);
 
+  // Creates an image which will inherit image representations from |source|.
+  // Image representations for scale factors not containted in |source| will be
+  // generated by resizing existing representations using |resize_method|.
+  static ImageSkia CreateImageWithFallbackResizeMethod(

[tbarzic, 2012/10/16 18:00:32]

do you have a better idea for this name? I'm not too thrilled with this one

+      const ImageSkia& source,
+      skia::ImageOperations::ResizeMethod resize_method);
+
   // Creates an image with drop shadow defined in |shadows| for |source|.
   static ImageSkia CreateImageWithDropShadow(const ImageSkia& source,
                                              const ShadowValues& shadows);