resources: orgainize directory.

Should make it easier to ask just for images.

Change-Id: If821743dc924c4bfbc6b2b2d29b14affde7b3afd
Reviewed-on: https://skia-review.googlesource.com/82684
Commit-Queue: Hal Canary <halcanary@google.com>
Reviewed-by: Leon Scroggins <scroggo@google.com>
diff --git a/gm/imagefilters.cpp b/gm/imagefilters.cpp
index dd6287b..146388f 100644
--- a/gm/imagefilters.cpp
+++ b/gm/imagefilters.cpp
@@ -163,7 +163,7 @@
 
     SkPaint paint;
     paint.setFilterQuality(kMedium_SkFilterQuality);
-    sk_sp<SkImage> image(GetResourceAsImage("mandrill_512.png"));
+    sk_sp<SkImage> image(GetResourceAsImage("images/mandrill_512.png"));
 
     canvas->translate(20, 20);
     for (const auto& xform : xforms) {