Add a "Simplify Page" option to the print preview dialog

chrome/browser/ui/webui/print_preview/print_preview_distiller.h

+// 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_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_DISTILLER_H_
+#define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_DISTILLER_H_
+
+#include "base/callback.h"
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/values.h"
+#include "content/public/browser/web_contents_observer.h"
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+// This class controls the rendering of the distilled contents
+// generated by a source web contents
+class PrintPreviewDistiller {
+ public:
+  PrintPreviewDistiller(content::WebContents* source_web_contents,
+                        base::Closure on_failed_callback,
+                        scoped_ptr<base::DictionaryValue> settings);
+  ~PrintPreviewDistiller();
+
+ private:
+  class WebContentsDelegateImpl;
+
+  // Create the web contents with a default
+  // size. |session_storage_namespace| indicates the namespace that
+  // the distiller content renderer's page should be part of.
+  void CreateDestinationWebContents(
+      content::SessionStorageNamespace* session_storage_namespace,
+      content::WebContents* source_web_contents,
+      scoped_ptr<base::DictionaryValue> settings,
+      base::Closure on_failed_callback);
+
+  content::WebContents* CreateWebContents(
+      content::SessionStorageNamespace* session_storage_namespace,
+      content::WebContents* source_web_contents);
+
+  // The distilled rendered WebContents; may be null.
+  scoped_ptr<content::WebContents> web_contents_;
+
+  scoped_ptr<WebContentsDelegateImpl> web_contents_delegate_;
+
+  DISALLOW_COPY_AND_ASSIGN(PrintPreviewDistiller);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_PRINT_PREVIEW_DISTILLER_H_