DevTools: specify trace event filter when installing trace callback

Source/core/inspector/TraceEventDispatcher.cpp

 /*
 * Copyright (C) 2013 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:
 *
 *     * Redistributions of source code must retain the above copyright
 * notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above
@@ skipping 82 matching lines @@
         if (it == m_handlers.end())
             continue;
         Vector<BoundTraceEventHandler>& handlers = it->value;
         for (size_t handlerIndex = 0; handlerIndex < handlers.size(); ++handlerIndex)
             (handlers[handlerIndex].instance->*(handlers[handlerIndex].method))(event);
     }
 }
 
 void TraceEventDispatcher::innerAddListener(const char* name, char phase, TraceEventTargetBase* instance, TraceEventHandlerMethod method, InspectorClient* client)
 {
+    static const char CategoryFilter[] = "devtools,webkit";
+
     ASSERT(isMainThread());
     MutexLocker locker(m_mutex);
     if (m_handlers.isEmpty())
-        client->setTraceEventCallback(dispatchEventOnAnyThread);
+        client->setTraceEventCallback(CategoryFilter, dispatchEventOnAnyThread);
     HandlersMap::iterator it = m_handlers.find(std::make_pair(name, phase));
     if (it == m_handlers.end())
         m_handlers.add(std::make_pair(name, phase), Vector<BoundTraceEventHandler>()).storedValue->value.append(BoundTraceEventHandler(instance, method));
     else
         it->value.append(BoundTraceEventHandler(instance, method));
 }
 
 void TraceEventDispatcher::removeAllListeners(TraceEventTargetBase* instance, InspectorClient* client)
 {
     ASSERT(isMainThread());
     processBackgroundEvents();
     {
         MutexLocker locker(m_mutex);
 
         HandlersMap remainingHandlers;
         for (HandlersMap::iterator it = m_handlers.begin(); it != m_handlers.end(); ++it) {
             Vector<BoundTraceEventHandler>& handlers = it->value;
             for (size_t j = 0; j < handlers.size();) {
                 if (handlers[j].instance == instance)
                     handlers.remove(j);
                 else
                     ++j;
             }
             if (!handlers.isEmpty())
                 remainingHandlers.add(it->key, it->value);
         }
         m_handlers.swap(remainingHandlers);
     }
     if (m_handlers.isEmpty())
-        client->setTraceEventCallback(0);
+        client->resetTraceEventCallback();
 }
 
 size_t TraceEventDispatcher::TraceEvent::findParameter(const char* name) const
 {
     for (int i = 0; i < m_argumentCount; ++i) {
         if (!strcmp(name, m_argumentNames[i]))
             return i;
     }
     return kNotFound;
 }
 
 const TraceEvent::TraceValueUnion& TraceEventDispatcher::TraceEvent::parameter(const char* name, unsigned char expectedType) const
 {
     static WebCore::TraceEvent::TraceValueUnion missingValue;
     size_t index = findParameter(name);
     if (index == kNotFound || m_argumentTypes[index] != expectedType) {
         ASSERT_NOT_REACHED();
         return missingValue;
     }
     return *reinterpret_cast<const WebCore::TraceEvent::TraceValueUnion*>(m_argumentValues + index);
 }
 
 } // namespace WebCore