WebMIDI: Add MIDIOptions dictionary

Source/modules/modules.gni

Index: Source/modules/modules.gni
diff --git a/Source/modules/modules.gni b/Source/modules/modules.gni
index 0f69d83a693f52f41286b2ff134b9efddbdd075b..d6cb0e6d31e056c09f10db88d41a0d629a803167 100644
--- a/Source/modules/modules.gni
+++ b/Source/modules/modules.gni
@@ -22,6 +22,9 @@ _tmp_modules_idl_files -= [
 ]
 modules_idl_files = get_path_info(_tmp_modules_idl_files, "abspath")
 
+modules_dictionary_idl_files =
+  get_path_info(_gypi.modules_dictionary_idl_files, "abspath")
+
 # 'partial interface' or target (right side of) 'implements'
 modules_dependency_idl_files =
   get_path_info(_gypi.modules_dependency_idl_files, "abspath")
@@ -33,14 +36,19 @@ modules_event_idl_files =
 generated_modules_files =
   get_path_info(_gypi.generated_modules_files, "abspath")
 
+generated_modules_dictionary_files =
+  get_path_info(_gypi.generated_modules_dictionary_files, "abspath")
+
 # Remove GYP variables from the list (need to do this before rebasing).
 _tmp_modules_files = _gypi.modules_files
 _tmp_modules_files -= [
   "<@(extra_blink_module_files)",
+  "<@(generated_modules_dictionary_files)",
   "<@(generated_modules_files)",
 ]
 modules_files = get_path_info(_tmp_modules_files, "abspath")
-modules_files += generated_modules_files  # Account for GYP var expansion.
+# Account for GYP var expansion.
+modules_files += generated_modules_files + generated_modules_dictionary_files
 
 # 'partial interface' or target (right side of) 'implements'
 modules_testing_dependency_idl_files =