Bug 1004677 - Restore double precision startTime. r=bjacob

--HG--
extra : rebase_source : 1579e50c3fcf44053ed83dc2411941120229729d

tools/profiler/TableTicker.cpp

@@ -115,7 +115,7 @@ void TableTicker::StreamMetaJSCustomObject(JSStreamWriter& b)
     b.NameValue("processType", XRE_GetProcessType());
 
     TimeDuration delta = TimeStamp::Now() - sStartTime;
-    b.NameValue("startTime", static_cast<float>(PR_Now()/1000.0 - delta.ToMilliseconds()));
+    b.NameValue("startTime", static_cast<double>(PR_Now()/1000.0 - delta.ToMilliseconds()));
 
     nsresult res;
     nsCOMPtr<nsIHttpProtocolHandler> http = do_GetService(NS_NETWORK_PROTOCOL_CONTRACTID_PREFIX "http", &res);