Improve ChromeTraceUtil logging, allow filename to be specified.

Expose this ChromeTraceUtil  logging to C-API: start/statelogging and submitProfileTiming
pybullet.submitProfileTiming, and STATE_LOGGING_PROFILE_TIMINGS used in startStateLogging
added example for Python profileTiming.py and C++ b3RobotSimulatorClientAPI::submitProfileTiming

examples/SharedMemory/SharedMemoryPublic.h

@@ -57,6 +57,7 @@ enum EnumSharedMemoryClientCommand
 	CMD_REQUEST_OPENGL_VISUALIZER_CAMERA,
 	CMD_REMOVE_BODY,
 	CMD_RESET_DYNAMIC_INFO,
+	CMD_PROFILE_TIMING,
     //don't go beyond this command!
     CMD_MAX_CLIENT_COMMANDS,
     
@@ -388,6 +389,7 @@ enum  b3StateLoggingType
 	STATE_LOGGING_VIDEO_MP4 = 3,
 	STATE_LOGGING_COMMANDS = 4,
 	STATE_LOGGING_CONTACT_POINTS = 5,
+	STATE_LOGGING_PROFILE_TIMINGS = 6,
 };