diff --git a/third_party/WebKit/Source/modules/webcl/WebCLEvent.cpp b/third_party/WebKit/Source/modules/webcl/WebCLEvent.cpp
index c4ac399d9c3f2..f2d4a699fe5c4 100644
--- a/third_party/WebKit/Source/modules/webcl/WebCLEvent.cpp
+++ b/third_party/WebKit/Source/modules/webcl/WebCLEvent.cpp
@@ -84,18 +84,20 @@ int WebCLEvent::getStatus()
     return CL_INVALID_VALUE;
 }
 
-unsigned WebCLEvent::getProfilingInfo(int paramName, ExceptionState& es)
+ScriptValue WebCLEvent::getProfilingInfo(ScriptState* scriptState, unsigned paramName, ExceptionState& es)
 {
+    v8::Isolate* isolate = scriptState->isolate();
+
     if (isReleased()) {
         es.throwWebCLException(WebCLException::INVALID_EVENT, WebCLException::invalidEventMessage);
-        return 0;
+        return ScriptValue(scriptState, v8::Null(isolate));
     }
 
     int status = getStatus();
     unsigned properties = m_commandQueue ? m_commandQueue->getProperties() : 0;
     if (isUserEvent() || status != CL_COMPLETE || !(properties & CL_QUEUE_PROFILING_ENABLE)) {
         es.throwWebCLException(WebCLException::PROFILING_INFO_NOT_AVAILABLE, WebCLException::profilingInfoNotAvailableMessage);
-        return 0;
+        return ScriptValue(scriptState, v8::Null(isolate));
     }
 
     cl_int err = CL_SUCCESS;
@@ -104,30 +106,30 @@ unsigned WebCLEvent::getProfilingInfo(int paramName, ExceptionState& es)
     case CL_PROFILING_COMMAND_QUEUED:
         err = clGetEventProfilingInfo(m_clEvent, CL_PROFILING_COMMAND_QUEUED, sizeof(cl_ulong), &ulongUnits, nullptr);
         if (err == CL_SUCCESS)
-            return static_cast<unsigned long long>(ulongUnits);
+            return ScriptValue(scriptState, v8::Number::New(isolate, static_cast<double>(ulongUnits)));
         break;
     case CL_PROFILING_COMMAND_SUBMIT:
         err = clGetEventProfilingInfo(m_clEvent, CL_PROFILING_COMMAND_SUBMIT, sizeof(cl_ulong), &ulongUnits, nullptr);
         if (err == CL_SUCCESS)
-            return static_cast<unsigned long long>(ulongUnits);
+            return ScriptValue(scriptState, v8::Number::New(isolate, static_cast<double>(ulongUnits)));
         break;
     case CL_PROFILING_COMMAND_START:
         err = clGetEventProfilingInfo(m_clEvent, CL_PROFILING_COMMAND_START, sizeof(cl_ulong), &ulongUnits, nullptr);
         if (err == CL_SUCCESS)
-            return static_cast<unsigned long long>(ulongUnits);
+            return ScriptValue(scriptState, v8::Number::New(isolate, static_cast<double>(ulongUnits)));
         break;
     case CL_PROFILING_COMMAND_END:
         err = clGetEventProfilingInfo(m_clEvent, CL_PROFILING_COMMAND_END, sizeof(cl_ulong), &ulongUnits, nullptr);
         if (err == CL_SUCCESS)
-            return static_cast<unsigned long long>(ulongUnits);
+            return ScriptValue(scriptState, v8::Number::New(isolate, static_cast<double>(ulongUnits)));
         break;
     default:
         es.throwWebCLException(WebCLException::INVALID_VALUE, WebCLException::invalidValueMessage);
-        return 0;
+        return ScriptValue(scriptState, v8::Null(isolate));
     }
 
     WebCLException::throwException(err, es);
-    return 0;
+    return ScriptValue(scriptState, v8::Null(isolate));
 }
 
 void WebCLEvent::setCallback(unsigned commandExecCallbackType, WebCLCallback* callback, ExceptionState& es)
diff --git a/third_party/WebKit/Source/modules/webcl/WebCLEvent.h b/third_party/WebKit/Source/modules/webcl/WebCLEvent.h
index 2b8415788150f..1b5e49cf21ba1 100644
--- a/third_party/WebKit/Source/modules/webcl/WebCLEvent.h
+++ b/third_party/WebKit/Source/modules/webcl/WebCLEvent.h
@@ -27,7 +27,7 @@ class WebCLEvent : public WebCLObject, public ScriptWrappable {
     static PassRefPtr<WebCLEvent> create();
 
     virtual ScriptValue getInfo(ScriptState*, unsigned, ExceptionState&);
-    unsigned getProfilingInfo(int, ExceptionState&);
+    virtual ScriptValue getProfilingInfo(ScriptState*, unsigned, ExceptionState&);
     void setCallback(unsigned, WebCLCallback*, ExceptionState&);
     void release() override;
 
diff --git a/third_party/WebKit/Source/modules/webcl/WebCLEvent.idl b/third_party/WebKit/Source/modules/webcl/WebCLEvent.idl
index acdcf2195f880..94d0142f6bc38 100644
--- a/third_party/WebKit/Source/modules/webcl/WebCLEvent.idl
+++ b/third_party/WebKit/Source/modules/webcl/WebCLEvent.idl
@@ -8,7 +8,7 @@ typedef unsigned long long CLulong;
     Constructor,
 ] interface WebCLEvent {
     [CallWith=ScriptState, RaisesException] any getInfo(CLenum name);
-    [RaisesException] CLulong getProfilingInfo(CLenum name);
+    [CallWith=ScriptState, RaisesException] any getProfilingInfo(CLenum name);
     [RaisesException] void setCallback(CLenum commandExecCallbackType,
                                        WebCLCallback notify);
     void release();