Binding: Make blink_python_runner more flexible

Before this CL, a GN wrapper "blink_python_runner" assumed its invoker
to have inputs, outputs, and deps.

This CL makes it more flexible, i.e. to assume invoker's sources, data,
and data_deps.
This change resolves the confusing situation, for example, having |data| in
an invoker does not affect on any actions.


Bug: 839389
Change-Id: Ieecb8d07adc7f020df7de869fd15789d76c81621
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1718065
Commit-Queue: Hitoshi Yoshida <peria@chromium.org>
Commit-Queue: Kent Tamura <tkent@chromium.org>
Reviewed-by: Kent Tamura <tkent@chromium.org>
Auto-Submit: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#681211}

third_party/blink/renderer/build/scripts/scripts.gni

@@ -96,11 +96,17 @@ make_core_generated_deps = [
 template("blink_python_runner") {
   action(target_name) {
     script = "$_scripts_dir/run_with_pythonpath.py"
-    inputs = [
+    sources = [
       invoker.script,
     ]
+    if (defined(invoker.sources)) {
+      sources += invoker.sources
+    }
     if (defined(invoker.inputs)) {
-      inputs += invoker.inputs
+      inputs = invoker.inputs
+    }
+    if (defined(invoker.data)) {
+      data = invoker.data
     }
     outputs = invoker.outputs
     args = [
@@ -115,6 +121,9 @@ template("blink_python_runner") {
     if (defined(invoker.deps)) {
       deps = invoker.deps
     }
+    if (defined(invoker.data_deps)) {
+      data_deps = invoker.data_deps
+    }
     forward_variables_from(invoker, [ "visibility" ])
   }
 }