[Contextual Search] Add Mojo-enabled API component.

chrome/renderer/contextualsearch/contextual_search_wrapper.h

Index: chrome/renderer/contextualsearch/contextual_search_wrapper.h
diff --git a/chrome/renderer/contextualsearch/contextual_search_wrapper.h b/chrome/renderer/contextualsearch/contextual_search_wrapper.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 CHROME_RENDERER_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_WRAPPER_H_
+#define CHROME_RENDERER_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_WRAPPER_H_
+
+#include "base/basictypes.h"
+#include "gin/wrappable.h"
+
+namespace blink {
+class WebFrame;
+}
+
+namespace gin {
+class Arguments;
+}
+
+namespace search {
+
+// Wrapper for injecting Contextual Search JavaScript
+// into a WebFrame.
+class ContextualSearchWrapper : public gin::Wrappable<ContextualSearchWrapper> {
+ public:
+  // Installs Contextual Search JavaScript.
+  static void Install(blink::WebFrame* frame);
+
+  // Required by gin::Wrappable.
+  static gin::WrapperInfo kWrapperInfo;
+
+ private:
+  // Intantiate by calling Install.
+  ContextualSearchWrapper();
+  ~ContextualSearchWrapper() override;
+
+  // gin::Wrappable.
+  gin::ObjectTemplateBuilder GetObjectTemplateBuilder(
+      v8::Isolate* isolate) final;
+
+  // Called by JavaScript to set the caption.
+  void SetCaption(const std::string& caption);
+
+  DISALLOW_COPY_AND_ASSIGN(ContextualSearchWrapper);
+};
+
+}  // namespace search
+
+#endif  // CHROME_RENDERER_CONTEXTUALSEARCH_CONTEXTUAL_SEARCH_WRAPPER_H_