PlzNavigate: stop navigations when opening a document for write

content/renderer/render_frame_impl.h

Index: content/renderer/render_frame_impl.h
diff --git a/content/renderer/render_frame_impl.h b/content/renderer/render_frame_impl.h
index 9f6f3f03cab52a4546b40c22b135db27ab43b796..52599138058e2bb379e2307a1986f6dde0a9bb40 100644
--- a/content/renderer/render_frame_impl.h
+++ b/content/renderer/render_frame_impl.h
@@ -593,6 +593,7 @@ class CONTENT_EXPORT RenderFrameImpl
   void didChangeThemeColor() override;
   void dispatchLoad() override;
   blink::WebEffectiveConnectionType getEffectiveConnectionType() override;
+  void abortClientNavigation() override;
   void didChangeSelection(bool is_empty_selection) override;
   bool handleCurrentKeyboardEvent() override;
   blink::WebColorChooser* createColorChooser(
@@ -901,6 +902,7 @@ class CONTENT_EXPORT RenderFrameImpl
                           int error_code);
   void OnReportContentSecurityPolicyViolation(
       const content::CSPViolationParams& violation_params);
+  void OnDroppedNavigation(int navigation_id);
   void OnGetSavableResourceLinks();
   void OnGetSerializedHtmlWithLocalLinks(
       const std::map<GURL, base::FilePath>& url_to_local_path,
@@ -1429,6 +1431,10 @@ class CONTENT_EXPORT RenderFrameImpl
   // is used and released in didStartProvisionalLoad().
   std::unique_ptr<PendingNavigationInfo> pending_navigation_info_;
 
+  // PlzNavigate
+  // An id to identify the last navigation sent to the browser.
+  int navigation_id_ = 0;
+
   base::WeakPtrFactory<RenderFrameImpl> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(RenderFrameImpl);