Log to UMA when x-origin frames (1) are created and (2) become visible

third_party/WebKit/Source/core/frame/LocalFrame.cpp

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Simon Hausmann <hausmann@kde.org>
  *                     2000 Stefan Schimanski <1Stein@gmx.de>
  *                     2001 George Staikos <staikos@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2005 Alexey Proskuryakov <ap@nypop.com>
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
@@ skipping 51 matching lines @@
 #include "core/page/ChromeClient.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
 #include "core/page/scrolling/ScrollingCoordinator.h"
 #include "core/paint/ObjectPainter.h"
 #include "core/paint/PaintInfo.h"
 #include "core/paint/PaintLayer.h"
 #include "core/paint/TransformRecorder.h"
 #include "core/svg/SVGDocumentExtensions.h"
 #include "platform/DragImage.h"
+#include "platform/Histogram.h"
 #include "platform/JSONValues.h"
 #include "platform/PluginScriptForbiddenScope.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/ScriptForbiddenScope.h"
 #include "platform/graphics/GraphicsContext.h"
 #include "platform/graphics/StaticBitmapImage.h"
 #include "platform/graphics/paint/ClipRecorder.h"
 #include "platform/graphics/paint/PaintController.h"
 #include "platform/graphics/paint/SkPictureBuilder.h"
 #include "platform/graphics/paint/TransformDisplayItem.h"
@@ skipping 128 matching lines @@
 }
 
 inline float parentTextZoomFactor(LocalFrame* frame)
 {
     Frame* parent = frame->tree().parent();
     if (!parent || !parent->isLocalFrame())
         return 1;
     return toLocalFrame(parent)->textZoomFactor();
 }
 
+// These are logged to UMA, so don't re-arrange them without creating a new histogram.
+enum FrameStateForDeferredLoading {
+    Created,
+    WouldLoadBecauseVisible,
+    // TODO(dgrogan): Add WouldLoadBecauseTopOrLeft, WouldLoadBecauseDisplayNone, etc
+
+    FrameStateForDeferredLoadingEnd
+};
+
+void RecordStateToHistogram(FrameStateForDeferredLoading state)
+{
+    DEFINE_STATIC_LOCAL(EnumerationHistogram, unseenFrameHistogram, ("DeferredFrameLoading.StatesV1", FrameStateForDeferredLoadingEnd));
+    unseenFrameHistogram.count(state);
+}
+
 } // namespace
 
 template class CORE_TEMPLATE_EXPORT Supplement<LocalFrame>;
 
 LocalFrame* LocalFrame::create(FrameLoaderClient* client, FrameHost* host, FrameOwner* owner, InterfaceProvider* interfaceProvider)
 {
     LocalFrame* frame = new LocalFrame(client, host, owner, interfaceProvider ? interfaceProvider : InterfaceProvider::getEmptyInterfaceProvider());
     InspectorInstrumentation::frameAttachedToParent(frame);
     return frame;
 }
@@ skipping 569 matching lines @@
     , m_spellChecker(SpellChecker::create(*this))
     , m_selection(FrameSelection::create(this))
     , m_eventHandler(new EventHandler(this))
     , m_console(FrameConsole::create(*this))
     , m_inputMethodController(InputMethodController::create(*this))
     , m_navigationDisableCount(0)
     , m_pageZoomFactor(parentPageZoomFactor(this))
     , m_textZoomFactor(parentTextZoomFactor(this))
     , m_inViewSourceMode(false)
     , m_interfaceProvider(interfaceProvider)
+    , m_visibilityWasLogged(false)
+    , m_creationWasLogged(false)
 {
     if (isLocalRoot())
         m_instrumentingAgents = new InstrumentingAgents();
     else
         m_instrumentingAgents = localFrameRoot()->m_instrumentingAgents;
 }
 
 WebFrameScheduler* LocalFrame::frameScheduler()
 {
     return m_frameScheduler.get();
@@ skipping 11 matching lines @@
     return static_cast<FrameLoaderClient*>(Frame::client());
 }
 
 PluginData* LocalFrame::pluginData() const
 {
     if (!loader().allowPlugins(NotAboutToInstantiatePlugin))
         return nullptr;
     return page()->pluginData();
 }
 
+void LocalFrame::didInstallNewRealDocument()
+{
+    if (!m_creationWasLogged && isCrossOriginSubframe()) {
+        m_creationWasLogged = true;
+        RecordStateToHistogram(Created);
+    }
+}
+
+void LocalFrame::onVisibilityMaybeChanged(bool visible)
+{
+    if (visible && !m_visibilityWasLogged && isCrossOriginSubframe()) {
+        m_visibilityWasLogged = true;
+        RecordStateToHistogram(WouldLoadBecauseVisible);
+    }
+}
+
 DEFINE_WEAK_IDENTIFIER_MAP(LocalFrame);
 
 FrameNavigationDisabler::FrameNavigationDisabler(LocalFrame& frame)
     : m_frame(&frame)
 {
     m_frame->disableNavigation();
 }
 
 FrameNavigationDisabler::~FrameNavigationDisabler()
 {
     m_frame->enableNavigation();
 }
 
 ScopedFrameBlamer::ScopedFrameBlamer(LocalFrame* frame)
     : m_frame(frame)
 {
     if (m_frame && m_frame->client() && m_frame->client()->frameBlameContext())
         m_frame->client()->frameBlameContext()->Enter();
 }
 
 ScopedFrameBlamer::~ScopedFrameBlamer()
 {
     if (m_frame && m_frame->client() && m_frame->client()->frameBlameContext())
         m_frame->client()->frameBlameContext()->Leave();
 }
 
 } // namespace blink