bind-gen: Workaround ChooseFileSystemEntriesType

Bug: 839389
Change-Id: I81e8fe019528dc7c2009c83fed797ef23ad1a15d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2022565
Commit-Queue: Yuki Shiino <yukishiino@chromium.org>
Reviewed-by: Hitoshi Yoshida <peria@chromium.org>
Cr-Commit-Position: refs/heads/master@{#735352}

third_party/blink/renderer/bindings/scripts/bind_gen/enumeration.py

@@ -163,10 +163,30 @@ def make_as_enum_function(cg_context):
 def make_nested_enum_class_def(cg_context):
     assert isinstance(cg_context, CodeGenContext)
 
-    enum_values = [
-        TextNode(name_style.constant(value))
-        for value in cg_context.enumeration.values
-    ]
+    enum_values = []
+    used_names = set()
+    for value in cg_context.enumeration.values:
+        name = name_style.constant(value)
+        # ChooseFileSystemEntriesType is defined as follows:
+        #
+        #   enum ChooseFileSystemEntriesType {
+        #       "open-file",
+        #       "openFile",
+        #       "save-file",
+        #       "saveFile",
+        #       "open-directory",
+        #       "openDirectory"
+        #   };
+        #
+        # Workaround until the old values get gone.
+        # TODO(https://crbug.com/1020715): Remove the workaround once the issue
+        # gets resolved.
+        if name in used_names:
+            assert (cg_context.enumeration.identifier ==
+                    "ChooseFileSystemEntriesType")
+            name = name + "2"
+        enum_values.append(TextNode(name))
+        used_names.add(name)
 
     return ListNode([
         TextNode("enum class Enum : enum_int_t {"),