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

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

Index: chrome/browser/ui/webui/print_preview/hidden_print_preview.h
diff --git a/chrome/browser/ui/webui/print_preview/hidden_print_preview.h b/chrome/browser/ui/webui/print_preview/hidden_print_preview.h
new file mode 100644
index 0000000000000000000000000000000000000000..6dce165a0d34f0ced208462afa253c7db571aa62
--- /dev/null
+++ b/chrome/browser/ui/webui/print_preview/hidden_print_preview.h
@@ -0,0 +1,116 @@
+// Copyright (c) 2015 The Chromium Authors. All rights reserved.

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

no (c)

+// 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_HIDDEN_PRINT_PREVIEW_H_
+#define CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_HIDDEN_PRINT_PREVIEW_H_
+
+#include "base/memory/scoped_ptr.h"
+#include "base/memory/weak_ptr.h"
+#include "base/observer_list.h"
+#include "base/values.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/web_contents_observer.h"
+#include "content/public/common/referrer.h"
+#include "ui/gfx/geometry/size.h"
+
+class Profile;
+class PrintPreviewUI;
+
+namespace net {
+class URLRequestContextGetter;
+}
+
+class HiddenPrintPreview : public content::NotificationObserver,

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

Please explain purpose of this class here.

+                          public content::WebContentsObserver,
+                          public base::SupportsWeakPtr<HiddenPrintPreview> {
+public:
+  HiddenPrintPreview(

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

HiddenPrintPreview -> PrintPreviewDistiller

+    content::WebContents* target_web_contents,

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

misaligned
please run "git cl format"

+    PrintPreviewUI* print_preview_ui,
+    scoped_ptr<base::DictionaryValue> settings);
+  ~HiddenPrintPreview() override;
+
+  // Start rendering the contents in the prerendered state. |size|
+  // indicates the rectangular dimensions that the hidden renderer's page should
+  // be. |session_storage_namespace| indicates the namespace that the hidden
+  // renderer's page should be part of.
+  virtual void StartRendering(
+      const gfx::Size& size,

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

why is this virtual?

+      content::SessionStorageNamespace* session_storage_namespace);
+
+  // content::WebContentsObserver implementation.
+  void RenderFrameCreated(content::RenderFrameHost* render_frame_host) override;
+  void DidStopLoading() override;
+  void DocumentLoadedInFrame(
+      content::RenderFrameHost* render_frame_host) override;
+  void DidStartProvisionalLoadForFrame(
+      content::RenderFrameHost* render_frame_host,
+      const GURL& validated_url,
+      bool is_error_page,
+      bool is_iframe_srcdoc) override;
+  void DidFinishLoad(content::RenderFrameHost* render_frame_host,
+                     const GURL& validated_url) override;
+  void DidNavigateMainFrame(
+      const content::LoadCommittedDetails& details,
+      const content::FrameNavigateParams& params) override;
+  void DidGetRedirectForResourceRequest(
+      content::RenderFrameHost* render_frame_host,
+      const content::ResourceRedirectDetails& details) override;
+
+  void RenderProcessGone(base::TerminationStatus status) override;
+
+  // content::NotificationObserver
+  void Observe(int type,
+               const content::NotificationSource& source,
+               const content::NotificationDetails& details) override;
+
+  // Sets the final status, calls OnDestroy and adds |this| to the
+  // PrerenderManager's pending deletes list.
+  void Destroy();
+
+ private:
+  class WebContentsDelegateImpl;
+
+  content::WebContents* CreateWebContents(
+      content::SessionStorageNamespace* session_storage_namespace);
+
+  // The hidden rendered WebContents; may be null.
+  scoped_ptr<content::WebContents> web_contents_;
+
+  // The session storage namespace id for use in matching. We must save it
+  // rather than get it from the RenderViewHost since in the control group
+  // we won't have a RenderViewHost.
+  int64 session_storage_namespace_id_;

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

unused

+
+  // The profile being used
+  Profile* profile_;

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

remove please 

+
+  content::NotificationRegistrar notification_registrar_;
+
+  // True when the main frame has finished loading.
+  bool has_finished_loading_;

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

unused

+
+  // Tracks whether or not rendering has been cancelled by calling Destroy.
+  // Used solely to prevent double deletion.
+  bool rendering_has_been_cancelled_;

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

unused

+
+  scoped_ptr<WebContentsDelegateImpl> web_contents_delegate_;
+
+  // The size of the WebView from the launching page.
+  gfx::Size size_;

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

it's always same, please remove and create constant in cc file

+
+  // The WebContents that contains the original page.
+  content::WebContents* target_web_contents_;

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

if you can AddProxyDialogForWebContents in constructor, you don't need this too

+
+  // Settings to pass during generation of the print preview.
+  scoped_ptr<base::DictionaryValue> settings_;
+
+  // The UI for the print preview that owns this hidden print preview generator.
+  PrintPreviewUI* print_preview_ui_;

[Vitaly Buka (NO REVIEWS), 2015/07/13 07:00:31]

replace with callback

+
+  DISALLOW_COPY_AND_ASSIGN(HiddenPrintPreview);
+};
+
+#endif  // CHROME_BROWSER_UI_WEBUI_PRINT_PREVIEW_HIDDEN_PRINT_PREVIEW_H_