Expose distiller functions to JavaScript

components/dom_distiller/content/renderer/distiller_native_javascript.h

Index: components/dom_distiller/content/renderer/distiller_native_javascript.h
diff --git a/components/dom_distiller/content/renderer/distiller_native_javascript.h b/components/dom_distiller/content/renderer/distiller_native_javascript.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_DOM_DISTILLER_CONTENT_RENDERER_DISTILLER_NATIVE_JAVASCRIPT_H_
+#define COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLER_NATIVE_JAVASCRIPT_H_
+
+#include "components/dom_distiller/content/common/distiller_javascript_service.mojom.h"
+#include "content/public/renderer/render_frame.h"
+#include "content/public/renderer/render_frame_observer.h"
+#include "v8/include/v8.h"
+
+namespace dom_distiller {
+
+// This class is the primary interface for custom JavaScript introduced by the
+// dom-distiller. Callbacks for JavaScript functionality and the communication
+// channel to the browser process are maintained here.
+class DistillerNativeJavaScript {
+ public:
+  explicit DistillerNativeJavaScript(content::RenderFrame* render_frame);
+  ~DistillerNativeJavaScript();
+
+  // Add the "distiller" JavaScript object and its functions to the current
+  // |RenderFrame|.
+  void AddJavaScriptObjectToFrame(v8::Local<v8::Context> context);
+
+ private:
+  // Native code for "distiller.echo" in JavaScript. This simply returns the
+  // provided string.
+  std::string DistillerEcho(const std::string& message);
+
+  content::RenderFrame* render_frame_;
+  DistillerJavaScriptServicePtr distiller_js_service_;
+};
+
+// static
+v8::Local<v8::Object> GetOrCreateDistillerObject(v8::Isolate* isolate,
+                                                 v8::Local<v8::Object> global);
+
+}  // namespace dom_distiller
+
+#endif  // COMPONENTS_DOM_DISTILLER_CONTENT_RENDERER_DISTILLER_NATIVE_JAVASCRIPT_H_