Cross-origin iframes: collect data under hypothetical loading strategies

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

 /*
  * 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, 2010, 2012 Apple Inc. All
  * rights reserved.
  * Copyright (C) 2008, 2009 Torch Mobile Inc. All rights reserved.
  * (http://www.torchmobile.com/)
  * Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 213 matching lines @@
   // https://html.spec.whatwg.org/#create-an-element-for-the-token
   CreatedByFragmentParser = CreatedByParser | AsynchronousCustomElements,
 };
 
 // Collect data about deferred loading of offscreen cross-origin documents. All
 // cross-origin documents log Created. Only those that would load log a reason.
 // We can then see the % of cross-origin documents that never have to load.
 // See https://crbug.com/635105.
 // Logged to UMA, don't re-arrange entries without creating a new histogram.
 enum WouldLoadReason {
+  Invalid,
   Created,
+  WouldLoad3ScreensAway,
+  WouldLoad2ScreensAway,
+  WouldLoad1ScreenAway,
+  WouldLoadVisible,
   // If outer and inner frames aren't in the same process we can't determine
   // if the inner frame is visible, so just load it.
   // TODO(dgrogan): Revisit after https://crbug.com/650433 is fixed.
-  WouldLoadOutOfProcess,
-  // The next five indicate frames that are probably used for cross-origin
-  // communication.
-  WouldLoadDisplayNone,
-  WouldLoadZeroByZero,
-  WouldLoadAboveAndLeft,
-  WouldLoadAbove,
-  WouldLoadLeft,
-  // We have to load documents in visible frames.
-  WouldLoadVisible,
+  WouldLoadNoParent,
 
   WouldLoadReasonEnd
 };
 
 using DocumentClassFlags = unsigned char;
 
 class CORE_EXPORT Document : public ContainerNode,
                              public TreeScope,
                              public SecurityContext,
                              public ExecutionContext,
@@ skipping 1028 matching lines @@
 
   Element* rootScroller() const;
   void setRootScroller(Element*, ExceptionState&);
   RootScrollerController& rootScrollerController() const {
     DCHECK(m_rootScrollerController);
     return *m_rootScrollerController;
   }
 
   bool isInMainFrame() const;
 
-  void maybeRecordLoadReason(WouldLoadReason);
-  WouldLoadReason wouldLoadReason() { return m_wouldLoadReason; }
+  void recordDeferredLoadReason(WouldLoadReason);
+  WouldLoadReason deferredLoadReason() { return m_wouldLoadReason; }
 
   PropertyRegistry* propertyRegistry();
 
   // Indicates whether the user has interacted with this particular Document.
   void setHasReceivedUserGesture() { m_hasReceivedUserGesture = true; }
   bool hasReceivedUserGesture() const { return m_hasReceivedUserGesture; }
 
   // Document maintains a counter of visible non-secure password
   // fields in the page. Used to notify the embedder when all visible
   // non-secure passwords fields are no longer visible.
@@ skipping 411 matching lines @@
 DEFINE_TYPE_CASTS(TreeScope, Document, document, true, true);
 
 }  // namespace blink
 
 #ifndef NDEBUG
 // Outside the WebCore namespace for ease of invocation from gdb.
 CORE_EXPORT void showLiveDocumentInstances();
 #endif
 
 #endif  // Document_h