DevTools: nits: introduce a handy asBool(bool*) and use across agents.

Source/core/inspector/InspectorTimelineAgent.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 347 matching lines @@
     if (isStarted()) {
         *errorString = "Timeline is already started";
         return;
     }
 
     if (maxCallStackDepth && *maxCallStackDepth >= 0)
         m_maxCallStackDepth = *maxCallStackDepth;
     else
         m_maxCallStackDepth = 5;
 
-    if (bufferEvents && *bufferEvents) {
+    if (asBool(bufferEvents)) {
         m_bufferedEvents = TypeBuilder::Array<TimelineEvent>::create();
         m_lastProgressTimestamp = timestamp();
     }
 
     if (liveEvents)
         setLiveEvents(*liveEvents);
 
     m_state->setLong(TimelineAgentState::timelineMaxCallStackDepth, m_maxCallStackDepth);
-    m_state->setBoolean(TimelineAgentState::includeCounters, includeCounters && *includeCounters);
-    m_state->setBoolean(TimelineAgentState::includeGPUEvents, includeGPUEvents && *includeGPUEvents);
-    m_state->setBoolean(TimelineAgentState::bufferEvents, bufferEvents && *bufferEvents);
+    m_state->setBoolean(TimelineAgentState::includeCounters, asBool(includeCounters));
+    m_state->setBoolean(TimelineAgentState::includeGPUEvents, asBool(includeGPUEvents));
+    m_state->setBoolean(TimelineAgentState::bufferEvents, asBool(bufferEvents));
     m_state->setString(TimelineAgentState::liveEvents, liveEvents ? *liveEvents : "");
 
     innerStart();
     bool fromConsole = false;
     m_frontend->started(&fromConsole);
 }
 
 bool InspectorTimelineAgent::isStarted()
 {
     return m_state->getBoolean(TimelineAgentState::started);
@@ skipping 971 matching lines @@
     visitor->trace(m_timelineAgent);
 }
 
 void TimelineThreadState::trace(Visitor* visitor)
 {
     visitor->trace(recordStack);
 }
 
 } // namespace blink