Add source map support to tick processor.

tools/tickprocessor-driver.js

Index: tools/tickprocessor-driver.js
diff --git a/tools/tickprocessor-driver.js b/tools/tickprocessor-driver.js
index 02cb81a55fcef48a0acced775f597724b21e4501..b7cc37a3ad2795afab9e71adb970104e500ecdda 100644
--- a/tools/tickprocessor-driver.js
+++ b/tools/tickprocessor-driver.js
@@ -44,6 +44,10 @@ var entriesProviders = {
 };
 
 var params = processArguments(arguments);
+var sourceMap = null;
+if (params.sourceMap) {
+  sourceMap = SourceMap.load(params.sourceMap);
+}
 var snapshotLogProcessor;
 if (params.snapshotLogFileName) {
   snapshotLogProcessor = new SnapshotLogProcessor();
@@ -57,6 +61,7 @@ var tickProcessor = new TickProcessor(
   params.stateFilter,
   snapshotLogProcessor,
   params.distortion,
-  params.range);
+  params.range,
+  sourceMap);
 tickProcessor.processLogFile(params.logFileName);
 tickProcessor.printStatistics();