[tools] Warn when using too few arguments for macros in js2c.py

Change-Id: I82782f170c48dbe3f853dc04ec7e07e3968583f3
Reviewed-on: https://chromium-review.googlesource.com/724183Reviewed-by: Mathias Bynens <mathias@chromium.org>
Commit-Queue: Camillo Bruni <cbruni@chromium.org>
Cr-Commit-Position: refs/heads/master@{#48698}

tools/js2c.py

@@ -125,6 +125,9 @@ def ExpandMacroDefinition(lines, pos, name_pattern, macro, expander):
       end = end + 1
     # Remember to add the last match.
     add_arg(lines[last_match:end-1])
+    if arg_index[0] < len(macro.args) -1:
+      lineno = lines.count(os.linesep, 0, start) + 1
+      raise Error('line %s: Too few arguments for macro "%s"' % (lineno, name_pattern.pattern))
     result = macro.expand(mapping)
     # Replace the occurrence of the macro with the expansion
     lines = lines[:start] + result + lines[end:]