[Contextual Search] Add Mojo-enabled API component.

components/contextual_search/browser/contextual_search_js_api_service_impl.h

Index: components/contextual_search/browser/contextual_search_js_api_service_impl.h
diff --git a/components/contextual_search/browser/contextual_search_js_api_service_impl.h b/components/contextual_search/browser/contextual_search_js_api_service_impl.h
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+// 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.
+
+#ifndef COMPONENTS_CONTEXTUAL_SEARCH_BROWSER_CONTEXTUAL_SEARCH_JS_API_SERVICE_IMPL_H_
+#define COMPONENTS_CONTEXTUAL_SEARCH_BROWSER_CONTEXTUAL_SEARCH_JS_API_SERVICE_IMPL_H_
+
+#include "base/macros.h"
+#include "components/contextual_search/browser/contextual_search_ui_handle.h"
+#include "components/contextual_search/common/contextual_search_js_api_service.mojom.h"
+#include "mojo/public/cpp/bindings/string.h"
+#include "mojo/public/cpp/bindings/strong_binding.h"
+
+namespace contextual_search {
+
+// This is the receiving end of Contextual Search JavaScript API calls.
+class ContextualSearchJsApiServiceImpl : public ContextualSearchJsApiService {
+ public:
+  ContextualSearchJsApiServiceImpl(
+      ContextualSearchUIHandle* contextual_search_ui_handle,
+      mojo::InterfaceRequest<ContextualSearchJsApiService> request);
+  ~ContextualSearchJsApiServiceImpl() override;
+
+  // Mojo ContextualSearchApiService implementation.
+  void HandleSetCaption(const mojo::String& message, bool does_answer) override;
+
+ private:
+  mojo::StrongBinding<ContextualSearchJsApiService> binding_;
+
+  // The UI that handles calls through this API.
+  ContextualSearchUIHandle* contextual_search_ui_handle_;
+
+  DISALLOW_COPY_AND_ASSIGN(ContextualSearchJsApiServiceImpl);
+};
+
+// static
+void CreateContextualSearchJsApiService(
+    ContextualSearchUIHandle* contextual_search_ui_handle,
+    mojo::InterfaceRequest<ContextualSearchJsApiService> request);
+
+}  // namespace contextual_search
+
+#endif  // COMPONENTS_CONTEXTUAL_SEARCH_BROWSER_CONTEXTUAL_SEARCH_JS_API_SERVICE_IMPL_H_