Add hooks for capturing meaningful text info, gently.

public/web/WebLocalFrame.h

 // Copyright 2014 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 WebLocalFrame_h
 #define WebLocalFrame_h
 
 #include "WebFrame.h"
 #include "WebFrameLoadType.h"
 
@@ skipping 73 matching lines @@
     // Navigation State -------------------------------------------------------
 
     // Returns true if the current frame's load event has not completed.
     virtual bool isLoading() const = 0;
 
     // Returns true if any resource load is currently in progress. Exposed
     // primarily for use in layout tests. You probably want isLoading()
     // instead.
     virtual bool isResourceLoadInProgress() const = 0;
 
+    // Returns true if there is a pending redirect or location change.
+    // This could be caused by:
+    // * an HTTP Refresh header
+    // * an X-Frame-Options header
+    // * the respective http-equiv meta tags
+    // * window.location value being mutated
+    // * CSP policy block
+    // * reload
+    // * form submission
+    virtual bool isNavigationScheduled() const = 0;

[esprehn, 2015/08/22 15:14:54]

Your description needs updating, it mentions the old name and purpose.

+
     // Override the normal rules for whether a load has successfully committed
     // in this frame. Used to propagate state when this frame has navigated
     // cross process.
     virtual void setCommittedFirstRealLoad() = 0;
 
     // Orientation Changes ----------------------------------------------------
 
     // Notify the frame that the screen orientation has changed.
     virtual void sendOrientationChangeEvent() = 0;
 
@@ skipping 60 matching lines @@
     // Returns the effective sandbox flags which are inherited from their parent frame.
     virtual WebSandboxFlags effectiveSandboxFlags() const = 0;
 
 protected:
     explicit WebLocalFrame(WebTreeScopeType scope) : WebFrame(scope) { }
 };
 
 } // namespace blink
 
 #endif // WebLocalFrame_h