[Remoting Host] Handle text event characters that are not presented on the keyboard

remoting/host/linux/x_server_character_injector.h

Index: remoting/host/linux/x_server_character_injector.h
diff --git a/remoting/host/linux/x_server_character_injector.h b/remoting/host/linux/x_server_character_injector.h
new file mode 100644
index 0000000000000000000000000000000000000000..102bb86104144141d00a2517d359563358cee761
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+++ b/remoting/host/linux/x_server_character_injector.h
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+// 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 REMOTING_HOST_LINUX_X_SERVER_CHARACTER_INJECTOR_H_
+#define REMOTING_HOST_LINUX_X_SERVER_CHARACTER_INJECTOR_H_
+
+#include <stdint.h>
+
+#include <queue>
+
+#include "base/macros.h"
+#include "base/memory/weak_ptr.h"
+#include "remoting/host/linux/x_server_key_mapper.h"
+
+namespace remoting {
+
+class KeyboardInterface;
+
+// This is a helper class for injecting unicode characters to XWindow server.
+// Characters will be queued up and sent when there is available resource.
+class XServerCharacterInjector {
+ public:
+  explicit XServerCharacterInjector(KeyboardInterface* keyboard);
+  ~XServerCharacterInjector();
+
+  void Inject(uint32_t code_point);
+
+ private:
+  void Schedule(base::TimeDelta delay);
+  void Consume();
+
+  KeyboardInterface* keyboard_;
+
+  scoped_refptr<base::SingleThreadTaskRunner> task_runner_;
+  XServerKeyMapper key_mapper_;
+  std::queue<uint32_t> characters_queue_;
+  bool consume_scheduled_ = false;
+
+  base::WeakPtrFactory<XServerCharacterInjector> weak_factory_;
+  DISALLOW_COPY_AND_ASSIGN(XServerCharacterInjector);
+};
+
+}  // namespace remoting
+
+#endif  // REMOTING_HOST_LINUX_X_SERVER_CHARACTER_INJECTOR_H_