--- src/3rdparty/chromium/tools/polymer/polymer.py.orig	2020-05-06 14:21:29 UTC
+++ src/3rdparty/chromium/tools/polymer/polymer.py
@@ -491,8 +491,6 @@ def main(argv):
   # across platforms.
   with io.open(os.path.join(out_folder, result[1]), mode='w', encoding='utf-8', newline='\n') as f:
     for l in result[0]:
-      if (type(l) != unicode):
-        l = unicode(l, encoding='utf-8')
       f.write(l)
   return
 
--- src/3rdparty/chromium/mojo/public/tools/bindings/generators/mojom_cpp_generator.py.orig	2020-05-06 10:21:29.000000000 -0400
+++ src/3rdparty/chromium/mojo/public/tools/bindings/generators/mojom_cpp_generator.py	2020-09-18 15:14:28.107285000 -0400
@@ -208,7 +208,14 @@
 
 class Generator(generator.Generator):
   def __init__(self, *args, **kwargs):
+    for x in args:
+        print("I t=" + str(type(x)) + "  v=" + str(x))
     super(Generator, self).__init__(*args, **kwargs)
+    for x in args:
+        print("I t=" + str(type(x)) + "  v=" + str(x))
+    if self.module is not None:
+        print("I structs_t  =" + str(type(self.module.structs)))
+        print("I unions_t   =" + str(type(self.module.unions)))
 
   def _GetExtraTraitsHeaders(self):
     extra_headers = set()
@@ -253,7 +260,7 @@
           for field in kind.fields:
             AddKind(field.kind)
 
-    for kind in self.module.structs + self.module.unions:
+    for kind in list(self.module.structs) + list(self.module.unions):
       for field in kind.fields:
         AddKind(field.kind)
 
@@ -271,9 +278,12 @@
     for interface in self.module.interfaces:
       all_enums.extend(interface.enums)
 
+    print("all_enums_t=" + str(type(all_enums)))
+    print("structs_t  =" + str(type(self.module.structs)))
+    print("unions_t   =" + str(type(self.module.unions)))
     types = set(self._GetFullMojomNameForKind(typename)
                 for typename in
-                self.module.structs + all_enums + self.module.unions)
+                list(self.module.structs) + list(all_enums) + list(self.module.unions))
     headers = set()
     for typename, typemap in self.typemap.items():
       if typename in types:
@@ -286,10 +296,10 @@
     When false, the generated headers do not need to include interface_ptr.h
     and similar.
     """
-    if len(self.module.interfaces) > 0:
+    if len(list(self.module.interfaces)) > 0:
       return True
     return any(map(mojom.ContainsHandlesOrInterfaces,
-                   self.module.structs + self.module.unions))
+                   list(self.module.structs) + list(self.module.unions)))
 
   def _ReferencesAnyNativeType(self):
     """Returns whether this module uses native types directly or indirectly.
@@ -300,7 +310,7 @@
     m = self.module
     # Note that interfaces can contain scoped native types.
     return any(map(mojom.ContainsNativeTypes,
-                   m.enums + m.structs + m.interfaces))
+                   list(m.enums) + list(m.structs) + list(m.interfaces)))
 
   def _GetDirectlyUsedKinds(self):
     for struct in self.module.structs + self.module.unions:
--- src/3rdparty/chromium/mojo/public/tools/bindings/generators/mojom_js_generator.py.orig	2020-09-18 15:47:26.521091000 -0400
+++ src/3rdparty/chromium/mojo/public/tools/bindings/generators/mojom_js_generator.py	2020-09-18 15:48:05.296752000 -0400
@@ -260,8 +260,8 @@
       "module": self.module,
       "mojom_filename": os.path.basename(self.module.path),
       "mojom_namespace": self.module.mojom_namespace,
-      "structs": self.module.structs + self._GetStructsFromMethods(),
-      "unions": self.module.unions,
+      "structs": list(self.module.structs) + list(self._GetStructsFromMethods()),
+      "unions": list(self.module.unions),
       "generate_fuzzing": self.generate_fuzzing,
       "generate_closure_exports": for_compile,
       "generate_struct_deserializers": self.js_generate_struct_deserializers,
--- src/3rdparty/chromium/mojo/public/tools/bindings/pylib/mojom/generate/generator.py.orig	2020-09-18 15:56:57.902602000 -0400
+++ src/3rdparty/chromium/mojo/public/tools/bindings/pylib/mojom/generate/generator.py	2020-09-18 16:13:16.982174000 -0400
@@ -112,7 +112,10 @@
 
   # Dump the data to disk.
   with open(full_path, "wb") as f:
-    f.write(contents)
+    if isinstance(contents, str):
+      f.write(contents.encode('utf-8'))
+    else:
+      f.write(contents)
 
 
 def AddComputedData(module):