Fixs bug resulting in double event delivery in mus

ui/aura/test/mus/input_method_mus_test_api.h

Index: ui/aura/test/mus/input_method_mus_test_api.h
diff --git a/ui/aura/test/mus/input_method_mus_test_api.h b/ui/aura/test/mus/input_method_mus_test_api.h
new file mode 100644
index 0000000000000000000000000000000000000000..93f3df590c03691b93313b996a67cc61de04a6ca
--- /dev/null
+++ b/ui/aura/test/mus/input_method_mus_test_api.h
@@ -0,0 +1,38 @@
+// Copyright 2017 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 UI_AURA_TEST_MUS_INPUT_METHOD_MUS_TEST_API_H_
+#define UI_AURA_TEST_MUS_INPUT_METHOD_MUS_TEST_API_H_
+
+#include "base/macros.h"
+#include "ui/aura/mus/input_method_mus.h"
+
+namespace aura {
+
+class InputMethodMusTestApi {
+ public:
+  static void SetInputMethod(InputMethodMus* input_method_mus,
+                             ui::mojom::InputMethod* input_method) {
+    input_method_mus->input_method_ = input_method;
+  }
+
+  static void CallSendKeyEventToInputMethod(
+      InputMethodMus* input_method_mus,
+      const ui::KeyEvent& event,
+      std::unique_ptr<InputMethodMus::EventResultCallback> ack_callback) {
+    input_method_mus->SendKeyEventToInputMethod(event, std::move(ack_callback));
+  }
+
+  static void Disable(InputMethodMus* input_method) {
+    DCHECK(input_method->pending_callbacks_.empty());
+    input_method->ime_server_.reset();
+  }
+
+ private:
+  DISALLOW_IMPLICIT_CONSTRUCTORS(InputMethodMusTestApi);
+};
+
+}  // namespace aura
+
+#endif  // UI_AURA_TEST_MUS_INPUT_METHOD_MUS_TEST_API_H_