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/colorfilterimagefilter.cpp b/gm/colorfilterimagefilter.cpp
index 7ca2426..dba1a13 100644
--- a/gm/colorfilterimagefilter.cpp
+++ b/gm/colorfilterimagefilter.cpp
@@ -67,7 +67,7 @@
 }
 
 static sk_sp<SkShader> sh_make_image() {
-    sk_sp<SkImage> image(GetResourceAsImage("mandrill_128.png"));
+    sk_sp<SkImage> image(GetResourceAsImage("images/mandrill_128.png"));
     if (!image) {
         return nullptr;
     }
@@ -225,7 +225,7 @@
 }
 
 DEF_SIMPLE_GM(mixershader, canvas, 800, 700) {
-    auto shaderA = GetResourceAsImage("mandrill_128.png")->makeShader(SkShader::kClamp_TileMode,
+    auto shaderA = GetResourceAsImage("images/mandrill_128.png")->makeShader(SkShader::kClamp_TileMode,
                                                                       SkShader::kClamp_TileMode);
     const SkColor colors[] = { SK_ColorGREEN, 0 };
     auto shaderB = SkGradientShader::MakeRadial({60, 60}, 55, colors, nullptr, 2,