IME for Mus: Use ui::InputMethodChromeOS to provide logic for ime driver.

chrome/browser/ui/views/ime_driver/noop_input_method.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 CHROME_BROWSER_UI_VIEWS_IME_DRIVER_NOOP_INPUT_METHOD_H_
+#define CHROME_BROWSER_UI_VIEWS_IME_DRIVER_NOOP_INPUT_METHOD_H_
+
+#include "services/ui/public/interfaces/ime/ime.mojom.h"
+
+// This is to be used on platforms where a proper implementation of
+// ui::mojom::InputMethod is missing. It doesn't handle any events and calls
+// the callback with false, which will result in client code handling events
+// locally.
+class NoOpInputMethod : public ui::mojom::InputMethod {

[sky, 2016/12/12 02:16:21]

NoOp makes me thing this does nothing, when it runs the callback. WDYT of
SimpleInputMethod? If you really REALLY prefer NoOp, then capitalization of
guards should be NO_OP.

[Hadi, 2016/12/12 16:04:58]

Done.

+ public:
+  NoOpInputMethod() {}
+  ~NoOpInputMethod() override {}
+
+  // ui::mojom::InputMethod:
+  void OnTextInputModeChanged(
+      ui::mojom::TextInputMode text_input_mode) override {}

[sky, 2016/12/12 02:16:21]

Don't inline these (see style guide).

[Hadi, 2016/12/12 16:04:58]

Done.

+  void OnTextInputTypeChanged(
+      ui::mojom::TextInputType text_input_type) override {}
+  void OnCaretBoundsChanged(const gfx::Rect& caret_bounds) override {}
+  void ProcessKeyEvent(std::unique_ptr<ui::Event> key_event,
+                       const ProcessKeyEventCallback& callback) override;
+  void CancelComposition() override {}
+
+ private:
+  DISALLOW_COPY_AND_ASSIGN(NoOpInputMethod);
+};
+
+#endif  // CHROME_BROWSER_UI_VIEWS_IME_DRIVER_NOOP_INPUT_METHOD_H_