Add metric to know how user use scrollbar

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

 /*
  * Copyright (C) 1998, 1999 Torben Weis <weis@kde.org>
  *                     1999 Lars Knoll <knoll@kde.org>
  *                     1999 Antti Koivisto <koivisto@kde.org>
  *                     2000 Dirk Mueller <mueller@kde.org>
  * Copyright (C) 2004, 2005, 2006, 2007, 2008 Apple Inc. All rights reserved.
  *           (C) 2006 Graham Dennis (graham.dennis@gmail.com)
  *           (C) 2006 Alexey Proskuryakov (ap@nypop.com)
  * Copyright (C) 2009 Google Inc. All rights reserved.
  *
@@ skipping 37 matching lines @@
 #include "core/frame/BrowserControls.h"
 #include "core/frame/EventHandlerRegistry.h"
 #include "core/frame/FrameHost.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Location.h"
 #include "core/frame/PageScaleConstraintsSet.h"
 #include "core/frame/PerformanceMonitor.h"
 #include "core/frame/RemoteFrame.h"
 #include "core/frame/RemoteFrameView.h"
 #include "core/frame/Settings.h"
+#include "core/frame/UseCounter.h"
 #include "core/frame/VisualViewport.h"
 #include "core/html/HTMLFrameElement.h"
 #include "core/html/HTMLPlugInElement.h"
 #include "core/html/TextControlElement.h"
 #include "core/html/parser/TextResourceDecoder.h"
 #include "core/input/EventHandler.h"
 #include "core/inspector/InspectorInstrumentation.h"
 #include "core/inspector/InspectorTraceEvents.h"
 #include "core/layout/LayoutAnalyzer.h"
 #include "core/layout/LayoutCounter.h"
@@ skipping 3681 matching lines @@
 
   if (!layerForScrolling())
     return;
   WebLayer* layer = layerForScrolling()->platformLayer();
   if (!layer)
     return;
   layer->setUserScrollable(userInputScrollable(HorizontalScrollbar),
                            userInputScrollable(VerticalScrollbar));
 }
 
+void FrameView::sendScrollbarUseUMA(ScrollbarPart part,
+                                    ScrollbarOrientation orientation) {
+  UseCounter::Feature scrollbarUseUMA;
+  switch (part) {
+    case BackButtonStartPart:
+    case ForwardButtonStartPart:
+    case BackButtonEndPart:
+    case ForwardButtonEndPart:
+      scrollbarUseUMA =
+          (orientation == VerticalScrollbar
+               ? UseCounter::ScrollbarUseVerticalScrollbarButton
+               : UseCounter::ScrollbarUseHorizontalScrollbarButton);
+      break;
+    case ThumbPart:
+      scrollbarUseUMA =
+          (orientation == VerticalScrollbar
+               ? UseCounter::ScrollbarUseVerticalScrollbarThumb
+               : UseCounter::ScrollbarUseHorizontalScrollbarThumb);
+      break;
+    case BackTrackPart:
+    case ForwardTrackPart:
+      scrollbarUseUMA =
+          (orientation == VerticalScrollbar
+               ? UseCounter::ScrollbarUseVerticalScrollbarTrack
+               : UseCounter::ScrollbarUseHorizontalScrollbarTrack);
+      break;
+    default:
+      return;
+  }
+
+  UseCounter::count(&frame(), scrollbarUseUMA);
+}
+
 IntSize FrameView::visibleContentSize(
     IncludeScrollbarsInRect scrollbarInclusion) const {
   return scrollbarInclusion == ExcludeScrollbars
              ? excludeScrollbars(frameRect().size())
              : frameRect().size();
 }
 
 IntRect FrameView::visibleContentRect(
     IncludeScrollbarsInRect scrollbarInclusion) const {
   return IntRect(IntPoint(flooredIntSize(m_scrollOffset)),
@@ skipping 1229 matching lines @@
   // This is the top-level frame, so no mapping necessary.
   if (m_frame->isMainFrame())
     return;
 
   LayoutRect viewportIntersectionRect(remoteViewportIntersection());
   transformState.move(
       LayoutSize(-viewportIntersectionRect.x(), -viewportIntersectionRect.y()));
 }
 
 }  // namespace blink