Introduce use counters for Blink specific editing event usage

Source/core/editing/Editor.cpp

 /*
  * Copyright (C) 2006, 2007, 2008, 2011 Apple Inc. All rights reserved.
  * Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies)
  *
  * 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.
  * 2. Redistributions in binary form must reproduce the above copyright
@@ skipping 10 matching lines @@
  * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
  * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 #include "core/editing/Editor.h"
 
 #include "CSSPropertyNames.h"
+#include "EventNames.h"
 #include "HTMLNames.h"
 #include "SVGNames.h"
 #include "XLinkNames.h"
 #include "bindings/v8/ExceptionStatePlaceholder.h"
 #include "core/accessibility/AXObjectCache.h"
 #include "core/clipboard/Clipboard.h"
 #include "core/clipboard/DataObject.h"
 #include "core/clipboard/Pasteboard.h"
 #include "core/css/CSSComputedStyleDeclaration.h"
 #include "core/css/StylePropertySet.h"
@@ skipping 20 matching lines @@
 #include "core/editing/markup.h"
 #include "core/events/ClipboardEvent.h"
 #include "core/events/KeyboardEvent.h"
 #include "core/events/ScopedEventQueue.h"
 #include "core/events/TextEvent.h"
 #include "core/fetch/ImageResource.h"
 #include "core/fetch/ResourceFetcher.h"
 #include "core/frame/FrameView.h"
 #include "core/frame/LocalFrame.h"
 #include "core/frame/Settings.h"
+#include "core/frame/UseCounter.h"
 #include "core/html/HTMLImageElement.h"
 #include "core/html/HTMLInputElement.h"
 #include "core/html/HTMLTextAreaElement.h"
 #include "core/html/parser/HTMLParserIdioms.h"
 #include "core/loader/EmptyClients.h"
 #include "core/page/EditorClient.h"
 #include "core/page/EventHandler.h"
 #include "core/page/FocusController.h"
 #include "core/page/Page.h"
 #include "core/rendering/HitTestResult.h"
@@ skipping 832 matching lines @@
     if (!canDelete())
         return;
     addToKillRing(selectedRange().get(), false);
     deleteSelectionWithSmartDelete(canSmartCopyOrDelete());
 
     // clear the "start new kill ring sequence" setting, because it was set to true
     // when the selection was updated by deleting the range
     setStartNewKillRingSequence(false);
 }
 
+static void countEditingEvent(ExecutionContext* executionContext, const Event* event, UseCounter::Feature featureOnInput, UseCounter::Feature featureOnTextArea, UseCounter::Feature featureOnContentEditable, UseCounter::Feature featureOnNonNode)
+{
+    EventTarget* eventTarget = event->target();
+    Node* node = eventTarget->toNode();
+    if (!node) {
+        UseCounter::count(executionContext, featureOnNonNode);
+        return;
+    }
+
+    if (isHTMLInputElement(node)) {
+        UseCounter::count(executionContext, featureOnInput);
+        return;
+    }
+
+    if (isHTMLTextAreaElement(node)) {
+        UseCounter::count(executionContext, featureOnTextArea);
+        return;
+    }
+
+    HTMLTextFormControlElement* control = enclosingTextFormControl(node);
+    if (isHTMLInputElement(control)) {
+        UseCounter::count(executionContext, featureOnInput);
+        return;
+    }
+
+    if (isHTMLTextAreaElement(control)) {
+        UseCounter::count(executionContext, featureOnTextArea);
+        return;
+    }
+
+    UseCounter::count(executionContext, featureOnContentEditable);
+}
+
+void Editor::countEvent(ExecutionContext* executionContext, const Event* event)
+{
+    if (!executionContext)
+        return;
+
+    if (event->type() == EventTypeNames::textInput) {
+        countEditingEvent(executionContext, event,
+            UseCounter::TextInputEventOnInput,
+            UseCounter::TextInputEventOnTextArea,
+            UseCounter::TextInputEventOnContentEditable,
+            UseCounter::TextInputEventOnNotNode);
+        return;
+    }
+
+    if (event->type() == EventTypeNames::webkitBeforeTextInserted) {
+        countEditingEvent(executionContext, event,
+            UseCounter::WebkitBeforeTextInsertedOnInput,
+            UseCounter::WebkitBeforeTextInsertedOnTextArea,
+            UseCounter::WebkitBeforeTextInsertedOnContentEditable,
+            UseCounter::WebkitBeforeTextInsertedOnNotNode);
+        return;
+    }
+
+    if (event->type() == EventTypeNames::webkitEditableContentChanged) {
+        countEditingEvent(executionContext, event,
+            UseCounter::WebkitEditableContentChangedOnInput,
+            UseCounter::WebkitEditableContentChangedOnTextArea,
+            UseCounter::WebkitEditableContentChangedOnContentEditable,
+            UseCounter::WebkitEditableContentChangedOnNotNode);
+    }
+}
+
 void Editor::copyImage(const HitTestResult& result)
 {
     writeImageNodeToPasteboard(Pasteboard::generalPasteboard(), result.innerNonSharedNode(), result.altDisplayString());
 }
 
 bool Editor::canUndo()
 {
     if (UndoStack* undoStack = this->undoStack())
         return undoStack->canUndo();
     return false;
@@ skipping 303 matching lines @@
     frame().selection().setShouldShowBlockCursor(m_overwriteModeEnabled);
 }
 
 void Editor::trace(Visitor* visitor)
 {
     visitor->trace(m_lastEditCommand);
     visitor->trace(m_mark);
 }
 
 } // namespace WebCore