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/drawatlas.cpp b/gm/drawatlas.cpp
index de44b6d..4a23e26 100644
--- a/gm/drawatlas.cpp
+++ b/gm/drawatlas.cpp
@@ -198,7 +198,7 @@
     const SkRSXform xform = SkRSXform::Make(1, 0, 0, 0);
     const SkColor color = 0x884488CC;
 
-    auto image = GetResourceAsImage("mandrill_128.png");
+    auto image = GetResourceAsImage("images/mandrill_128.png");
     auto verts = make_vertices(image, tex, color);
     const sk_sp<SkColorFilter> filters[] = {
         nullptr,