Add PreviewsInfoBarTabHelper

chrome/browser/previews/previews_infobar_tab_helper.h

+// Copyright 2016 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_PREVIEWS_PREVIEWS_INFOBAR_TAB_HELPER_H_
+#define CHROME_BROWSER_PREVIEWS_PREVIEWS_INFOBAR_TAB_HELPER_H_
+
+#include "base/macros.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/browser/web_contents_user_data.h"
+
+class GURL;
+
+namespace content {
+class RenderFrameHost;
+}
+
+// Tracks whether a preview infobar has been shown for a page. Handles showing

[bengr, 2016/09/08 00:41:36]

preview -> previews?

[megjablon, 2016/09/08 01:04:15]

Done.

+// the infobar when the main frame response indicates a Lite Page.
+class PreviewsInfoBarTabHelper
+    : public content::WebContentsObserver,
+      public content::WebContentsUserData<PreviewsInfoBarTabHelper> {
+ public:
+  ~PreviewsInfoBarTabHelper() override;
+
+  // Indicates whether the InfoBar for a preview has been shown for the page.
+  bool displayed_preview_infobar() const {
+    return displayed_preview_infobar_;
+  }
+
+  // Sets whether the InfoBar for a preview has been shown for the page.
+  // |displayed_preview_infobar_| is reset to false on
+  // DidStartProvisionalLoadForFrame for the main frame.
+  void set_displayed_preview_infobar(bool displayed) {
+    displayed_preview_infobar_ = displayed;
+  }
+
+ private:
+  friend class content::WebContentsUserData<PreviewsInfoBarTabHelper>;
+
+  explicit PreviewsInfoBarTabHelper(content::WebContents* web_contents);
+
+  // Overridden from content::WebContentsObserver:
+  void DidStartProvisionalLoadForFrame(
+      content::RenderFrameHost* render_frame_host,
+      const GURL& validated_url,
+      bool is_error_page,
+      bool is_iframe_srcdoc) override;
+  void DidFinishNavigation(
+      content::NavigationHandle* navigation_handle) override;
+
+  // True if the InfoBar for a preview has been shown for the page.
+  bool displayed_preview_infobar_;
+
+  DISALLOW_COPY_AND_ASSIGN(PreviewsInfoBarTabHelper);
+};
+
+#endif  // CHROME_BROWSER_PREVIEWS_PREVIEWS_INFOBAR_TAB_HELPER_H_