Added network components for blimp text input feature

blimp/client/feature/web_input_feature.cc

+// 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.
+
+#include "blimp/client/feature/web_input_feature.h"
+
+#include <string>
+
+#include "blimp/common/create_blimp_message.h"
+#include "blimp/common/proto/blimp_conversions.h"
+#include "blimp/common/proto/blimp_message.pb.h"
+#include "net/base/net_errors.h"
+
+namespace blimp {
+namespace client {
+
+WebInputFeature::WebInputFeature() {}
+
+WebInputFeature::~WebInputFeature() {}
+
+void WebInputFeature::set_outgoing_message_processor(
+    scoped_ptr<BlimpMessageProcessor> processor) {
+  outgoing_message_processor_ = std::move(processor);
+}
+
+void WebInputFeature::SetDelegate(WebInputFeatureDelegate* delegate) {
+  delegate_ = delegate;
+}
+
+void WebInputFeature::SendImeTextToEngine(const std::string& text) {
+  ImeMessage* ime_message;
+  scoped_ptr<BlimpMessage> blimp_message =
+      CreateBlimpMessage(&ime_message, tab_id_);
+  ime_message->set_render_widget_id(render_widget_id_);
+  ime_message->set_type(ImeMessage::SHOW_TEXT);
+  ime_message->set_ime_text(text);
+
+  outgoing_message_processor_->ProcessMessage(std::move(blimp_message),
+                                              net::CompletionCallback());
+}
+
+void WebInputFeature::ProcessMessage(scoped_ptr<BlimpMessage> message,
+                                     const net::CompletionCallback& callback) {
+  DCHECK(!callback.is_null());
+  DCHECK(message->type() == BlimpMessage::IME);
+
+  DCHECK(delegate_ != NULL) << "WebInputFeatureDelegate not set";

[Khushal, 2016/03/17 10:02:45]

nit: nullptr.

[shaktisahu, 2016/03/18 19:08:05]

Done.

+
+  const ImeMessage& ime_message = message->ime();
+  tab_id_ = message->target_tab_id();

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

Should we ever clear these?  If so, what's the contract between the calls to the
delegates and the SendImeTextToEngine()?  (ie: we should probably explain the
underlying behavior of those methods in the header comments)

+  render_widget_id_ = ime_message.render_widget_id();
+
+  switch (ime_message.type()) {
+    case ImeMessage::SHOW_IME:
+      delegate_->OnShowImeRequested(
+          TextInputTypeFromProto(ime_message.text_input_type()),
+          ime_message.ime_text());
+      break;
+    case ImeMessage::HIDE_IME:
+      delegate_->OnHideImeRequested();
+      break;
+    case ImeMessage::SHOW_TEXT:
+      NOTREACHED();
+      break;
+    case ImeMessage::UNKNOWN:
+      NOTREACHED();
+  }
+
+  callback.Run(net::OK);
+}
+
+}  // namespace client
+}  // namespace blimp