use SkColorInfo in fm

Just refactoring code that predates SkColorInfo.

Change-Id: Iba5ffdf91e2e2517bf55ea8c5a36c4fe6583a6b3
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/376760
Reviewed-by: Mike Klein <mtklein@google.com>
Commit-Queue: Mike Klein <mtklein@google.com>
diff --git a/tools/fm/fm.cpp b/tools/fm/fm.cpp
index 9314014..b373520 100644
--- a/tools/fm/fm.cpp
+++ b/tools/fm/fm.cpp
@@ -543,7 +543,7 @@
 
     sk_sp<SkColorSpace> cs = FLAGS_legacy ? nullptr
                                           : SkColorSpace::MakeRGB(tf,gamut);
-    const SkImageInfo unsized_info = SkImageInfo::Make(0,0, ct,at,cs);
+    const SkColorInfo color_info{ct,at,cs};
 
     AutoreleasePool pool;
     for (auto source : sources) {
@@ -551,7 +551,7 @@
         fprintf(stdout, "%50s", source.name.c_str());
         fflush(stdout);
 
-        const SkImageInfo info = unsized_info.makeDimensions(source.size);
+        const SkImageInfo info = SkImageInfo::Make(source.size, color_info);
 
         auto draw = [&source](SkCanvas* canvas) {
             Result result = source.draw(canvas);