Adds AL logging for Blink core events.

Source/core/html/HTMLButtonElement.cpp

Index: Source/core/html/HTMLButtonElement.cpp
diff --git a/Source/core/html/HTMLButtonElement.cpp b/Source/core/html/HTMLButtonElement.cpp
index 55f7defa1a4b3f46f8b212caf5aebcc284713745..7051b4a4aa282f413a0e24512906bb98a577abf2 100644
--- a/Source/core/html/HTMLButtonElement.cpp
+++ b/Source/core/html/HTMLButtonElement.cpp
@@ -26,6 +26,7 @@
 #include "config.h"
 #include "core/html/HTMLButtonElement.h"
 
+#include "bindings/v8/V8DOMActivityLogger.h"
 #include "core/HTMLNames.h"
 #include "core/dom/Attribute.h"
 #include "core/events/KeyboardEvent.h"
@@ -213,4 +214,20 @@ bool HTMLButtonElement::supportsAutofocus() const
     return true;
 }
 
+Node::InsertionNotificationRequest HTMLButtonElement::insertedInto(ContainerNode* insertionPoint)
+{
+    if (insertionPoint->inDocument()) {
+        V8DOMActivityLogger* activityLogger = V8DOMActivityLogger::currentActivityLoggerIfIsolatedWorld();
+        if (activityLogger) {
+            Vector<String> argv;
+            argv.append("button");
+            argv.append(fastGetAttribute(typeAttr));
+            argv.append(fastGetAttribute(formmethodAttr));
+            argv.append(fastGetAttribute(formactionAttr));
+            activityLogger->logEvent("blinkAddElement", argv.size(), argv.data());
+        }
+    }
+    return HTMLFormControlElement::insertedInto(insertionPoint);
+}
+
 } // namespace