Add UMA metrics for root scroller intervention to track forcing passive breakage.

third_party/WebKit/Source/core/testing/Internals.cpp

 /*
  * Copyright (C) 2012 Google Inc. All rights reserved.
  * Copyright (C) 2013 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  *
  * 1.  Redistributions of source code must retain the above copyright
  *     notice, this list of conditions and the following disclaimer.
@@ skipping 120 matching lines @@
 #include "platform/Language.h"
 #include "platform/PlatformKeyboardEvent.h"
 #include "platform/RuntimeEnabledFeatures.h"
 #include "platform/TraceEvent.h"
 #include "platform/geometry/IntRect.h"
 #include "platform/geometry/LayoutRect.h"
 #include "platform/graphics/GraphicsLayer.h"
 #include "platform/heap/Handle.h"
 #include "platform/inspector_protocol/FrontendChannel.h"
 #include "platform/scroll/ProgrammaticScrollAnimator.h"
+#include "platform/testing/HistogramTester.h"
 #include "platform/weborigin/SchemeRegistry.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebConnectionType.h"
 #include "public/platform/WebGraphicsContext3DProvider.h"
 #include "public/platform/WebLayer.h"
 #include "wtf/InstanceCounter.h"
 #include "wtf/PtrUtil.h"
 #include "wtf/dtoa.h"
 #include "wtf/text/StringBuffer.h"
 #include <deque>
@@ skipping 63 matching lines @@
 Internals* Internals::create(ScriptState* scriptState)
 {
     return new Internals(scriptState);
 }
 
 Internals::~Internals()
 {
 }
 
 static RuntimeEnabledFeatures::Backup* sFeaturesBackup = nullptr;
+static std::unique_ptr<HistogramTester> sHistogramSnapshot;
 
 void Internals::resetToConsistentState(Page* page)
 {
     ASSERT(page);
 
     if (!sFeaturesBackup)
         sFeaturesBackup = new RuntimeEnabledFeatures::Backup;
+    if (!sHistogramSnapshot)
+        sHistogramSnapshot.reset(new HistogramTester());
     sFeaturesBackup->restore();
     page->setIsCursorVisible(true);
     page->setPageScaleFactor(1);
     page->deprecatedLocalMainFrame()->view()->layoutViewportScrollableArea()->setScrollPosition(IntPoint(0, 0), ProgrammaticScroll);
     overrideUserPreferredLanguages(Vector<AtomicString>());
     if (!page->deprecatedLocalMainFrame()->spellChecker().isContinuousSpellCheckingEnabled())
         page->deprecatedLocalMainFrame()->spellChecker().toggleContinuousSpellChecking();
     if (page->deprecatedLocalMainFrame()->editor().isOverwriteModeEnabled())
         page->deprecatedLocalMainFrame()->editor().toggleOverwriteModeEnabled();
 
@@ skipping 138 matching lines @@
         exceptionState.throwDOMException(InvalidAccessError, "Must supply document to check");
         return;
     }
 
     if (doc->layoutViewItem().isNull())
         return;
 
     doc->layoutViewItem().clearHitTestCache();
 }
 
+int Internals::histogramCount(const String& name, int bucket) const
+{
+    return sHistogramSnapshot->histogramCount(name.utf8().data(), bucket);
+}
+
+void Internals::clearHistogramCounts()
+{
+    sHistogramSnapshot.reset(new HistogramTester());
+}
+
 bool Internals::isPreloaded(const String& url)
 {
     return isPreloadedBy(url, contextDocument());
 }
 
 bool Internals::isPreloadedBy(const String& url, Document* document)
 {
     if (!document)
         return false;
     return document->fetcher()->isPreloaded(document->completeURL(url));
@@ skipping 2231 matching lines @@
 }
 
 String Internals::getProgrammaticScrollAnimationState(Node* node) const
 {
     if (ScrollableArea* scrollableArea = scrollableAreaForNode(node))
         return scrollableArea->programmaticScrollAnimator().runStateAsText();
     return String();
 }
 
 } // namespace blink