Push deps on buildbot/filters down to test.gni.

This clarifies dependency on test filter data, since
it is only used by the "test" template.

Also, it paves the path for building v8 on Fuchsia
standalone: the "fuchsia_package_runner" template
can be used directly in v8 repo, and in v8-only
checkout.

Change-Id: Ibe171c48ee818cc5b722294f682f83c3ae240908
Reviewed-on: https://chromium-review.googlesource.com/1180731Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Reviewed-by: Wez <wez@chromium.org>
Commit-Queue: Dimitri Glazkov <dglazkov@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586056}

build/config/fuchsia/rules.gni

@@ -51,10 +51,13 @@ template("fuchsia_package_runner") {
 
     deps = [
       "//build/config/fuchsia:blobstore_extended_qcow2",
-      "//testing/buildbot/filters:fuchsia_filters",
       invoker.package,
     ]
 
+    if (defined(invoker.deps)) {
+      deps += invoker.deps
+    }
+
     script = "//build/fuchsia/create_runner_script.py"
 
     outputs = [

testing/test.gni

@@ -261,6 +261,10 @@ template("test") {
       runner_script = "//build/fuchsia/test_runner.py"
       package = ":$_pkg_target"
       package_name_override = _output_name
+
+      deps = [
+        "//testing/buildbot/filters:fuchsia_filters",
+      ]
     }
 
     executable(_exec_target) {