Fix FilesApp UI Test generation script i18n substitutions.

Support replacing $i18nRaw{} in addition to $i18n{}.
Fix 'textDirection' as used in text_defaults.css.

Change-Id: I1f9b5c97ba28e69f35c42f55ae08b12df9eb9842
Reviewed-on: https://chromium-review.googlesource.com/c/1454059
Commit-Queue: Joel Hockey <joelhockey@chromium.org>
Commit-Queue: Sam McNally <sammc@chromium.org>
Auto-Submit: Joel Hockey <joelhockey@chromium.org>
Reviewed-by: Sam McNally <sammc@chromium.org>
Cr-Commit-Position: refs/heads/master@{#629056}

ui/file_manager/file_manager/test/scripts/create_test_main.py

@@ -99,7 +99,7 @@ strings = {
     'fontFamily': 'Roboto, sans-serif',
     'fontSize': '75%',
     'language': 'en',
-    'textdirection': 'ltr',
+    'textDirection': 'ltr',
     }
 grdp_files = [
     '../../../chrome/app/chromeos_strings.grdp',
@@ -118,9 +118,10 @@ for m in re.finditer(r'SET_STRING\(\"(.*?)\",\s+(\w+)\);', private_api_strings):
   strings[m.group(1)] = resource_bundle.get(m.group(2), m.group(2))
 
 
+# Substitute $i18n{} and $i18nRaw{} in template with strings from grdp files.
 def i18n(template):
   repl = lambda x: strings.get(x.group(1), x.group())
-  return re.sub(r'\$i18n\{(.*?)\}', repl, template)
+  return re.sub(r'\$i18n(?:Raw)?\{(.*?)\}', repl, template)
 
 # Substitute $i18n{}.
 # Update relative paths.