[Contextual Search] Add Mojo-enabled API component.

components/contextual_search/contextual_search_api_service_impl.cc

+// Copyright 2015 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 "components/contextual_search/contextual_search_api_service_impl.h"
+
+#include "components/contextual_search/contextual_search_ui_handle.h"
+
+namespace contextual_search {
+
+ContextualSearchApiServiceImpl::ContextualSearchApiServiceImpl(
+    ContextualSearchUIHandle* contextual_search_ui_handle,
+    mojo::InterfaceRequest<ContextualSearchApiService> request)
+    : binding_(this, request.Pass()),
+      contextual_search_ui_handle_(contextual_search_ui_handle) {}
+
+ContextualSearchApiServiceImpl::~ContextualSearchApiServiceImpl() {}
+
+void ContextualSearchApiServiceImpl::HandleSetCaption(
+    const mojo::String& caption) {
+  contextual_search_ui_handle_->SetCaption(caption);
+}
+
+// static
+void CreateContextualSearchApiService(
+    ContextualSearchUIHandle* contextual_search_ui_handle,
+    mojo::InterfaceRequest<ContextualSearchApiService> request) {
+  // This is strongly bound and owned by the pipe.
+  new ContextualSearchApiServiceImpl(contextual_search_ui_handle,
+                                     request.Pass());
+}
+
+}  // namespace contextual_search