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

ui/gfx/image/image_skia_operations.cc

Index: ui/gfx/image/image_skia_operations.cc
diff --git a/ui/gfx/image/image_skia_operations.cc b/ui/gfx/image/image_skia_operations.cc
index 8afaf876eab4e777ab66f447b1b37bac9554ebb8..32a0cb33761b0c00932f1b5e7921d50782a896fe 100644
--- a/ui/gfx/image/image_skia_operations.cc
+++ b/ui/gfx/image/image_skia_operations.cc
@@ -320,14 +320,17 @@ class ResizeSource : public ImageSkiaSource {
 
   // gfx::ImageSkiaSource overrides:
   virtual ImageSkiaRep GetImageForScale(ui::ScaleFactor scale_factor) OVERRIDE {
-    const ImageSkiaRep& image_rep = source_.GetRepresentation(scale_factor);
-    if (image_rep.GetWidth() == target_dip_size_.width() &&
-        image_rep.GetHeight() == target_dip_size_.height())
-      return image_rep;
-
     const float scale = ui::GetScaleFactorScale(scale_factor);
     const Size target_pixel_size = gfx::ToFlooredSize(
         target_dip_size_.Scale(scale));
+
+    const ImageSkiaRep& image_rep = source_.GetRepresentation(scale_factor);
+
+    if (image_rep.pixel_width() == target_pixel_size.width() &&
+        image_rep.pixel_height() == target_pixel_size.height()) {
+      return ImageSkiaRep(image_rep.sk_bitmap(), scale_factor);
+    }
+
     const SkBitmap resized = skia::ImageOperations::Resize(
         image_rep.sk_bitmap(),
         resize_method_,
@@ -449,6 +452,14 @@ ImageSkia ImageSkiaOperations::CreateResizedImage(
 }
 
 // static
+ImageSkia ImageSkiaOperations::CreateImageWithCustomResizeMethod(
+      const ImageSkia& source,
+      skia::ImageOperations::ResizeMethod method) {
+  return ImageSkia(new ResizeSource(source, method, source.size()),
+                   source.size());
+}
+
+// static
 ImageSkia ImageSkiaOperations::CreateImageWithDropShadow(
     const ImageSkia& source,
     const ShadowValues& shadows) {