Add UseCounters for Selection methods that take null

third_party/WebKit/Source/core/editing/DOMSelection.cpp

 /*
  * Copyright (C) 2007, 2009 Apple Inc. All rights reserved.
  * Copyright (C) 2012 Google 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 25 matching lines @@
 #include "bindings/core/v8/ExceptionStatePlaceholder.h"
 #include "core/dom/Document.h"
 #include "core/dom/ExceptionCode.h"
 #include "core/dom/Node.h"
 #include "core/dom/Range.h"
 #include "core/dom/TreeScope.h"
 #include "core/editing/EditingUtilities.h"
 #include "core/editing/FrameSelection.h"
 #include "core/editing/iterators/TextIterator.h"
 #include "core/frame/LocalFrame.h"
+#include "core/frame/UseCounter.h"
 #include "core/inspector/ConsoleMessage.h"
 #include "wtf/text/WTFString.h"
 
 namespace blink {
 
 static Position createPosition(Node* node, int offset)
 {
     ASSERT(offset >= 0);
     if (!node)
         return Position();
@@ skipping 145 matching lines @@
         return 0;
     return m_frame->selection().isNone() ? 0 : 1;
 }
 
 void DOMSelection::collapse(Node* node, int offset, ExceptionState& exceptionState)
 {
     if (!m_frame)
         return;
 
     if (!node) {
+        UseCounter::count(m_frame, UseCounter::SelectionCollapseNull);
         m_frame->selection().clear();
         return;
     }
 
     if (offset < 0) {
         exceptionState.throwDOMException(IndexSizeError, String::number(offset) + " is not a valid offset.");
         return;
     }
 
     if (!isValidForPosition(node))
@@ skipping 53 matching lines @@
     if (baseOffset < 0) {
         exceptionState.throwDOMException(IndexSizeError, String::number(baseOffset) + " is not a valid base offset.");
         return;
     }
 
     if (extentOffset < 0) {
         exceptionState.throwDOMException(IndexSizeError, String::number(extentOffset) + " is not a valid extent offset.");
         return;
     }
 
+    if (!baseNode || !extentNode)
+        UseCounter::count(m_frame, UseCounter::SelectionSetBaseAndExtentNull);
+
     if (!isValidForPosition(baseNode) || !isValidForPosition(extentNode))
         return;
 
     VisiblePosition visibleBase = createVisiblePosition(createPosition(baseNode, baseOffset));
     VisiblePosition visibleExtent = createVisiblePosition(createPosition(extentNode, extentOffset));
 
     m_frame->selection().moveTo(visibleBase, visibleExtent);
 }
 
 void DOMSelection::modify(const String& alterString, const String& directionString, const String& granularityString)
@@ skipping 268 matching lines @@
         m_treeScope->document().addConsoleMessage(ConsoleMessage::create(JSMessageSource, ErrorMessageLevel, message));
 }
 
 DEFINE_TRACE(DOMSelection)
 {
     visitor->trace(m_treeScope);
     DOMWindowProperty::trace(visitor);
 }
 
 } // namespace blink