When historyEntryRequiresUserGesture is enabled, exempt docs that have been committed for 5 seconds

third_party/WebKit/Source/core/dom/Document.cpp

 /*
  * Copyright (C) 1999 Lars Knoll (knoll@kde.org)
  *           (C) 1999 Antti Koivisto (koivisto@kde.org)
  *           (C) 2001 Dirk Mueller (mueller@kde.org)
  *           (C) 2006 Alexey Proskuryakov (ap@webkit.org)
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2011, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2008, 2009, 2011, 2012 Google Inc. All rights reserved.
@@ skipping 264 matching lines @@
 using namespace HTMLNames;
 
 static const unsigned cMaxWriteRecursionDepth = 21;
 
 // This amount of time must have elapsed before we will even consider scheduling
 // a layout without a delay.
 // FIXME: For faster machines this value can really be lowered to 200.  250 is
 // adequate, but a little high for dual G5s. :)
 static const int cLayoutScheduleThreshold = 250;
 
+// After a document has been committed for this time, it can create a history
+// entry even if the user hasn't interacted with the document.
+static const int cElapsedTimeForHistoryEntryWithoutUserGestureMS = 5000;
+
 // DOM Level 2 says (letters added):
 //
 // a) Name start characters must have one of the categories Ll, Lu, Lo, Lt, Nl.
 // b) Name characters other than Name-start characters must have one of the
 //    categories Mc, Me, Mn, Lm, or Nd.
 // c) Characters in the compatibility area (i.e. with character code greater
 //    than #xF900 and less than #xFFFE) are not allowed in XML names.
 // d) Characters which have a font or compatibility decomposition (i.e. those
 //    with a "compatibility formatting tag" in field 5 of the database -- marked
 //    by field 5 beginning with a "<") are not allowed.
@@ skipping 2887 matching lines @@
   if (documentElement() && !isHTMLHtmlElement(*documentElement()))
     return true;
 
   return false;
 }
 
 int Document::elapsedTime() const {
   return static_cast<int>((currentTime() - m_startTime) * 1000);
 }
 
+bool Document::canCreateHistoryEntry() const {
+  // TODO(japhet): This flag controls an intervention to require a user gesture
+  // or a long time on page in order for a content-initiated navigation to add
+  // an entry to the back/forward list. Removing the flag and making this the
+  // default will require updating a couple hundred tests that currently depend
+  // on creating history entries without user gestures. I'm waiting to update
+  // the tests until the feature is proven to minimize churn.
+  // https://bugs.chromium.org/p/chromium/issues/detail?id=638198
+  if (!m_frame->settings()->getHistoryEntryRequiresUserGesture())
+    return true;
+  if (m_frame->hasReceivedUserGesture())
+    return true;
+  return elapsedTime() >= cElapsedTimeForHistoryEntryWithoutUserGestureMS;
+}
+
 void Document::write(const SegmentedString& text,
                      Document* enteredDocument,
                      ExceptionState& exceptionState) {
   if (importLoader()) {
     exceptionState.throwDOMException(
         InvalidStateError, "Imported document doesn't support write().");
     return;
   }
 
   if (!isHTMLDocument()) {
@@ skipping 3439 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (blink::Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif