Build chrome.input.ime.* API in GN mode.

chrome/browser/extensions/api/input_ime/input_ime_event_router_base.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 "chrome/browser/extensions/api/input_ime/input_ime_event_router_base.h"
+
+#include "base/strings/string_number_conversions.h"
+
+namespace extensions {
+
+InputImeEventRouterBase::InputImeEventRouterBase(Profile* profile)
+    : profile_(profile), next_request_id_(1) {}
+
+InputImeEventRouterBase::~InputImeEventRouterBase() {}
+
+void InputImeEventRouterBase::OnKeyEventHandled(const std::string& extension_id,
+                                                const std::string& request_id,
+                                                bool handled) {
+  RequestMap::iterator request = request_map_.find(request_id);
+  if (request == request_map_.end()) {
+    LOG(ERROR) << "Request ID not found: " << request_id;
+    return;
+  }
+
+  std::string component_id = request->second.first;

[Devlin, 2016/01/07 23:08:29]

why make the copy?  In fact, is this even needed at all?

[Azure Wei, 2016/01/08 06:40:55]

Yeah, component_id was not used here. Deleted.

+  (request->second.second).Run(handled);

[Devlin, 2016/01/07 23:08:29]

parens not needed.

[Azure Wei, 2016/01/08 06:40:55]

Done.

+  request_map_.erase(request);
+}
+
+std::string InputImeEventRouterBase::AddRequest(
+    const std::string& component_id,
+    ui::IMEEngineHandlerInterface::KeyEventDoneCallback& key_data) {
+  std::string request_id = base::IntToString(next_request_id_);
+  ++next_request_id_;
+
+  request_map_[request_id] = std::make_pair(component_id, key_data);
+
+  return request_id;
+}
+
+}  // namespace extensions