[Contextual Search] Add Mojo-enabled API component.

components/contextual_search/renderer/overlay_page_notifier_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/renderer/overlay_page_notifier_service_impl.h"
+
+#include "components/contextual_search/renderer/overlay_js_render_frame_observer.h"
+
+namespace contextual_search {
+
+OverlayPageNotifierServiceImpl::OverlayPageNotifierServiceImpl(
+    OverlayJsRenderFrameObserver* observer,
+    mojo::InterfaceRequest<OverlayPageNotifierService> request)
+    : binding_(this, request.Pass()), overlay_js_observer_(observer) {}
+
+OverlayPageNotifierServiceImpl::~OverlayPageNotifierServiceImpl() {}
+
+void OverlayPageNotifierServiceImpl::NotifyIsContextualSearchOverlay() {
+  overlay_js_observer_->SetIsContextualSearchOverlay();
+}
+
+}  // namespace contextual_search