Cross-origin iframes: collect data under hypothetical loading strategies

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 378 matching lines @@
   Document* document = toDocument(context);
   if (Element* element = document->autofocusElement()) {
     document->setAutofocusElement(0);
     element->focus();
   }
 }
 
 static void recordLoadReasonToHistogram(WouldLoadReason reason) {
   DEFINE_STATIC_LOCAL(
       EnumerationHistogram, unseenFrameHistogram,
-      ("Navigation.DeferredDocumentLoading.StatesV3", WouldLoadReasonEnd));
+      ("Navigation.DeferredDocumentLoading.StatesV4", WouldLoadReasonEnd));
   unseenFrameHistogram.count(reason);
 }
 
 Document::Document(const DocumentInit& initializer,
                    DocumentClassFlags documentClasses)
     : ContainerNode(0, CreateDocument),
       TreeScope(*this),
       m_hasNodesWithPlaceholderStyle(false),
       m_evaluateMediaQueriesOnStyleRecalc(false),
       m_pendingSheetLayout(NoLayoutWithPendingSheets),
@@ skipping 73 matching lines @@
       m_compositorPendingAnimations(new CompositorPendingAnimations()),
       m_templateDocumentHost(nullptr),
       m_didAssociateFormControlsTimer(
           TaskRunnerHelper::get(TaskType::Internal, this),
           this,
           &Document::didAssociateFormControlsTimerFired),
       m_timers(TaskRunnerHelper::get(TaskType::Timer, this)->clone()),
       m_hasViewportUnits(false),
       m_parserSyncPolicy(AllowAsynchronousParsing),
       m_nodeCount(0),
-      m_wouldLoadReason(Created),
+      m_wouldLoadReason(Invalid),
       m_passwordCount(0) {
   if (m_frame) {
     DCHECK(m_frame->page());
     provideContextFeaturesToDocumentFrom(*this, *m_frame->page());
 
     m_fetcher = m_frame->loader().documentLoader()->fetcher();
     FrameFetchContext::provideDocumentToContext(m_fetcher->context(), this);
 
     CustomElementRegistry* registry =
         m_frame->localDOMWindow()
@@ skipping 6025 matching lines @@
   visitor->trace(m_propertyRegistry);
   visitor->trace(m_styleReattachDataMap);
   Supplementable<Document>::trace(visitor);
   TreeScope::trace(visitor);
   ContainerNode::trace(visitor);
   ExecutionContext::trace(visitor);
   SecurityContext::trace(visitor);
   SynchronousMutationNotifier::trace(visitor);
 }
 
-void Document::maybeRecordLoadReason(WouldLoadReason reason) {
-  DCHECK(m_wouldLoadReason == Created || reason != Created);
+void Document::recordDeferredLoadReason(WouldLoadReason reason) {
+  DCHECK(m_wouldLoadReason == Invalid || reason != Created);
+  DCHECK(reason != Invalid);
   DCHECK(frame());
-  if (m_wouldLoadReason == Created && frame()->isCrossOriginSubframe() &&
-      frame()->loader().stateMachine()->committedFirstRealDocumentLoad()) {
-    recordLoadReasonToHistogram(reason);
-  }
+  DCHECK(frame()->isCrossOriginSubframe());
+  if (reason <= m_wouldLoadReason ||
+      !frame()->loader().stateMachine()->committedFirstRealDocumentLoad())
+    return;
+  for (int i = m_wouldLoadReason + 1; i <= reason; ++i)
+    recordLoadReasonToHistogram(static_cast<WouldLoadReason>(i));
   m_wouldLoadReason = reason;
 }
 
 DEFINE_TRACE_WRAPPERS(Document) {
   visitor->traceWrappers(m_importsController);
   visitor->traceWrappers(m_implementation);
   visitor->traceWrappers(m_styleSheetList);
   visitor->traceWrappers(m_styleEngine);
   for (int i = 0; i < numNodeListInvalidationTypes; ++i) {
     for (auto list : m_nodeLists[i]) {
@@ skipping 20 matching lines @@
 }
 
 void showLiveDocumentInstances() {
   WeakDocumentSet& set = liveDocumentSet();
   fprintf(stderr, "There are %u documents currently alive:\n", set.size());
   for (Document* document : set)
     fprintf(stderr, "- Document %p URL: %s\n", document,
             document->url().getString().utf8().data());
 }
 #endif