Add hooks for capturing meaningful text info, gently.

public/web/WebLocalFrame.h

Index: public/web/WebLocalFrame.h
diff --git a/public/web/WebLocalFrame.h b/public/web/WebLocalFrame.h
index 23accad6f7dd06445635fc9938fe14d9ab2472a3..ce8ecff1800bc75152f0441fde4159e19f5cc5e1 100644
--- a/public/web/WebLocalFrame.h
+++ b/public/web/WebLocalFrame.h
@@ -91,6 +91,14 @@ public:
     // 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
+    virtual bool isRedirectOrLocationChangePending() const = 0;
+
     // 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.