[Contextual Search] Add Mojo-enabled API component.

components/contextual_search/browser/contextual_search_js_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/browser/contextual_search_js_api_service_impl.h"
+
+#include "components/contextual_search/browser/contextual_search_ui_handle.h"
+
+namespace contextual_search {
+
+ContextualSearchJsApiServiceImpl::ContextualSearchJsApiServiceImpl(
+    ContextualSearchUIHandle* contextual_search_ui_handle,
+    mojo::InterfaceRequest<ContextualSearchJsApiService> request)
+    : binding_(this, request.Pass()),
+      contextual_search_ui_handle_(contextual_search_ui_handle) {}
+
+ContextualSearchJsApiServiceImpl::~ContextualSearchJsApiServiceImpl() {}
+
+void ContextualSearchJsApiServiceImpl::HandleSetCaption(
+    const mojo::String& caption,
+    bool does_answer) {
+  contextual_search_ui_handle_->SetCaption(caption, does_answer);
+}
+
+// static
+void CreateContextualSearchJsApiService(
+    ContextualSearchUIHandle* contextual_search_ui_handle,
+    mojo::InterfaceRequest<ContextualSearchJsApiService> request) {
+  // This is strongly bound and owned by the pipe.
+  new ContextualSearchJsApiServiceImpl(contextual_search_ui_handle,
+                                       request.Pass());
+}
+
+}  // namespace contextual_search