[Fuchsia] Add missing dependencies to //skia/test_fonts target.

//skia/test_fonts' Fuchsia implementation makes use of the fuchsia.fonts
io and sys libraries, so should depend on all of them.

TBR=borenet

Bug: 952652
Change-Id: I1bd2dff61a9029069e640390435b3c86d62efa54
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1610697
Commit-Queue: Wez <wez@chromium.org>
Auto-Submit: Wez <wez@chromium.org>
Reviewed-by: Sergey Ulanov <sergeyu@chromium.org>
Reviewed-by: Eric Boren <borenet@chromium.org>
Cr-Commit-Position: refs/heads/master@{#659230}

skia/BUILD.gn

@@ -832,7 +832,11 @@ source_set("test_fonts") {
       "ext/test_fonts_fuchsia.cc",
       "ext/test_fonts_fuchsia.h",
     ]
-    deps += [ "//third_party/fuchsia-sdk/sdk:sys" ]
+    deps += [
+      "//third_party/fuchsia-sdk/sdk:fonts",
+      "//third_party/fuchsia-sdk/sdk:io",
+      "//third_party/fuchsia-sdk/sdk:sys",
+    ]
   }
   if (is_linux) {
     sources += [ "ext/test_fonts_linux.cc" ]