Add human readable programmatic enum name/values to chrome.automation.

chrome/renderer/extensions/automation_internal_custom_bindings.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "chrome/renderer/extensions/automation_internal_custom_bindings.h"
 
 #include "base/bind.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/values.h"
 #include "chrome/common/extensions/manifest_handlers/automation.h"
+#include "content/public/renderer/v8_value_converter.h"
 #include "extensions/common/extension.h"
 #include "extensions/common/manifest.h"
 #include "extensions/renderer/script_context.h"
+#include "ui/accessibility/ax_enums.h"
+
+using v8::Local;
+using v8::Object;
+using v8::String;

[not at google - send to devlin, 2014/05/29 19:48:14]

I would loosely prefer not doing "using" here, since we never do anywhere else
in chrome/renderer/extensions, but I have noticed you're fond of that. The names
are just...  quite generic.

[David Tseng, 2014/05/29 22:12:26]

Reverted back to v8 prefixes.

+
+namespace {
+
+// Helper to convert an enum to a V8 object.
+template <typename EnumType>
+Local<Object> ToEnumObject(v8::Isolate* isolate,
+                           EnumType start_after,
+                           EnumType end_at) {
+  Local<Object> object = Object::New(isolate);
+  for (int i = start_after + 1; i <= end_at; ++i) {
+    Local<String> value = String::NewFromUtf8(
+        isolate, ui::ToString(static_cast<EnumType>(i)).c_str());
+    object->Set(value, value);
+  }
+  return object;
+}
+
+}  // namespace
 
 namespace extensions {
 
 AutomationInternalCustomBindings::AutomationInternalCustomBindings(
     ScriptContext* context) : ObjectBackedNativeHandler(context) {
   RouteFunction(
       "IsInteractPermitted",
       base::Bind(&AutomationInternalCustomBindings::IsInteractPermitted,
                  base::Unretained(this)));
+  RouteFunction(
+      "GetSchemaAdditions",
+      base::Bind(&AutomationInternalCustomBindings::GetSchemaAdditions,
+                 base::Unretained(this)));
 }
 
 AutomationInternalCustomBindings::~AutomationInternalCustomBindings() {
 }
 
 void AutomationInternalCustomBindings::IsInteractPermitted(
     const v8::FunctionCallbackInfo<v8::Value>& args) {
   const Extension* extension = context()->extension();
   CHECK(extension);
   const AutomationInfo* automation_info = AutomationInfo::Get(extension);
   CHECK(automation_info);
   args.GetReturnValue().Set(
       v8::Boolean::New(GetIsolate(), automation_info->interact));
 }
 
+void AutomationInternalCustomBindings::GetSchemaAdditions(
+    const v8::FunctionCallbackInfo<v8::Value>& args) {
+  Local<Object> additions = Object::New(GetIsolate());
+
+  additions->Set(String::NewFromUtf8(GetIsolate(), "EventType"),
+                 ToEnumObject<ui::AXEvent>(

[not at google - send to devlin, 2014/05/29 19:48:14]

hm, can C++ not guess that this is ui::AXEvent (etc) from the enum parameters
you're passing it?

[David Tseng, 2014/05/29 22:12:26]

Looks like clang can infer the type from the arguments; done.

+                     GetIsolate(), ui::AX_EVENT_NONE, ui::AX_EVENT_LAST));
+
+  additions->Set(String::NewFromUtf8(GetIsolate(), "RoleType"),
+                 ToEnumObject<ui::AXRole>(
+                     GetIsolate(), ui::AX_ROLE_NONE, ui::AX_ROLE_LAST));
+
+  additions->Set(String::NewFromUtf8(GetIsolate(), "StateType"),
+                 ToEnumObject<ui::AXState>(
+                     GetIsolate(), ui::AX_STATE_NONE, ui::AX_STATE_LAST));
+
+  args.GetReturnValue().Set(additions);
+}
+
 }  // namespace extensions