Added network components for blimp text input feature

blimp/client/feature/web_input_feature.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 BLIMP_CLIENT_FEATURE_WEB_INPUT_FEATURE_H_
+#define BLIMP_CLIENT_FEATURE_WEB_INPUT_FEATURE_H_
+
+#include <map>
+#include <string>
+
+#include "base/macros.h"
+#include "blimp/client/blimp_client_export.h"
+#include "blimp/net/blimp_message_processor.h"
+
+namespace blimp {
+namespace client {
+
+// Handles all incoming and outgoing protobuf messages for text input
+// of type BlimpMessage::IME. The handling of the message is delegated to the
+// WebInputFeatureDelegate.
+class BLIMP_CLIENT_EXPORT WebInputFeature : public BlimpMessageProcessor {

[haibinlu, 2016/03/17 18:59:46]

ImeFeature to be consistent with proto nameing?

+ public:
+  // A delegate to be notified of text input events.
+  class WebInputFeatureDelegate {
+   public:
+    virtual void OnShowImeRequested(int input_type,

[David Trainor- moved to gerrit, 2016/03/17 21:53:29]

Change to be ui::TextInputType?

+                                    const std::string& text) = 0;
+    virtual void OnHideImeRequested() = 0;
+  };
+
+  WebInputFeature();
+  ~WebInputFeature() override;
+
+  // Set the BlimpMessageProcessor that will be used to send BlimpMessage::IME
+  // messages to the engine.
+  void set_outgoing_message_processor(
+      scoped_ptr<BlimpMessageProcessor> processor);
+
+  // Sets a WebInputFeatureDelegate to be notified of all text input messages.
+  void SetDelegate(WebInputFeatureDelegate* delegate);
+
+  // Sends text from IME to the blimp engine.
+  void SendImeTextToEngine(const std::string& text);
+
+ private:
+  // BlimpMessageProcessor implementation.
+  void ProcessMessage(scoped_ptr<BlimpMessage> message,
+                      const net::CompletionCallback& callback) override;
+
+  WebInputFeatureDelegate* delegate_;
+
+  int tab_id_;

[David Trainor- moved to gerrit, 2016/03/17 21:53:29]

Add comments here.  What are these and why do we need these in this class?  When
are they set/cleared?

+  int render_widget_id_;
+
+  // Used to send BlimpMessage::IME messages to the engine.
+  scoped_ptr<BlimpMessageProcessor> outgoing_message_processor_;
+
+  DISALLOW_COPY_AND_ASSIGN(WebInputFeature);
+};
+
+}  // namespace client
+}  // namespace blimp
+
+#endif  // BLIMP_CLIENT_FEATURE_WEB_INPUT_FEATURE_H_