Expose Fetch API related classes to Window and WorkerGlobalScope.

Source/bindings/scripts/generate_global_constructors.py

Index: Source/bindings/scripts/generate_global_constructors.py
diff --git a/Source/bindings/scripts/generate_global_constructors.py b/Source/bindings/scripts/generate_global_constructors.py
index a6c8598a0f050652113da52d6bda2dec86a22c16..06b90f26ce1c48ae2ae547ffdf66015426604310 100755
--- a/Source/bindings/scripts/generate_global_constructors.py
+++ b/Source/bindings/scripts/generate_global_constructors.py
@@ -25,7 +25,7 @@ import re
 import sys
 
 from collections import defaultdict
-from utilities import get_file_contents, idl_filename_to_interface_name, read_file_to_list, write_file, get_interface_extended_attributes_from_idl, is_callback_interface_from_idl
+from utilities import get_file_contents, idl_filename_to_interface_name, read_file_to_list, write_file, get_interface_extended_attributes_from_idl, get_interface_exposed_arguments, is_callback_interface_from_idl
 
 interface_name_to_global_names = {}
 global_name_to_constructors = defaultdict(list)
@@ -87,13 +87,20 @@ def record_global_constructors(idl_filename):
     # associated with ECMAScript global environments whose global object
     # implements an interface that has a matching global name.
     exposed_global_names = extended_attributes.get('Exposed', 'Window').strip('()').split(',')
-    # Blink has Exposed(Arguments) form. In the form, each argument type
-    # represents the global context.
-    exposed_global_names = [name.split(' ')[0] for name in exposed_global_names]
 
-    new_constructors_list = generate_global_constructors_list(interface_name, extended_attributes)
-    for exposed_global_name in exposed_global_names:
-        global_name_to_constructors[exposed_global_name].extend(new_constructors_list)
+    exposed_arguments = get_interface_exposed_arguments(idl_file_contents)
+    if exposed_global_names == ['Window'] and exposed_arguments is not None:
+        for argument in exposed_arguments:
+            if 'RuntimeEnabled' in extended_attributes:
+                raise ValueError('RuntimeEnabled should not be used with Exposed(Arguments)')
+            attributes = extended_attributes.copy()
+            attributes['RuntimeEnabled'] = argument['runtime_enabled']
+            new_constructors_list = generate_global_constructors_list(interface_name, attributes)
+            global_name_to_constructors[argument['exposed']].extend(new_constructors_list)
+    else:
+        new_constructors_list = generate_global_constructors_list(interface_name, extended_attributes)
+        for name in exposed_global_names:
+            global_name_to_constructors[name].extend(new_constructors_list)
 
 
 def generate_global_constructors_list(interface_name, extended_attributes):