Define WebTextInputMode as a enum in the public API.

third_party/WebKit/public/platform/WebTextInputMode.h

+// Copyright 2016 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.
+
+#ifndef WebTextInputMode_h
+#define WebTextInputMode_h
+
+namespace blink {
+
+// This mode corrensponds to inputmode
+// https://html.spec.whatwg.org/#attr-fe-inputmode
+enum WebTextInputMode {
+  kWebTextInputModeDefault,
+  kWebTextInputModeVerbatim,
+  kWebTextInputModeLatin,
+  kWebTextInputModeLatinName,
+  kWebTextInputModeLatinProse,
+  kWebTextInputModeFullWidthLatin,
+  kWebTextInputModeKana,
+  kWebTextInputModeKanaName,
+  kWebTextInputModeKataKana,
+  kWebTextInputModeNumeric,
+  kWebTextInputModeTel,
+  kWebTextInputModeEmail,
+  kWebTextInputModeUrl,
+  kWebTextInputModeMax = kWebTextInputModeUrl,
+};
+
+}  // namespace blink
+
+#endif  // WebTextInputMode_h