[vm-service] Encode ticks directly as integers, since they are expect to stay in JS integer range.

runtime/observatory/lib/src/cpu_profile/cpu_profile.dart

 // Copyright (c) 2015, the Dart project authors.  Please see the AUTHORS file
 // for details. All rights reserved. Use of this source code is governed by a
 // BSD-style license that can be found in the LICENSE file.
 
 part of cpu_profiler;
 
 abstract class CallTreeNode<NodeT extends M.CallTreeNode>
     implements M.CallTreeNode {
   final List<NodeT> children;
   final int count;
@@ skipping 459 matching lines @@
   String formattedCpuTime = '';
   String formattedOnStackTime = '';
   final Set<String> attributes = new Set<String>();
   final Map<ProfileCode, int> callers = new Map<ProfileCode, int>();
   final Map<ProfileCode, int> callees = new Map<ProfileCode, int>();
 
   void _processTicks(List<String> profileTicks) {
     assert(profileTicks != null);
     assert((profileTicks.length % 3) == 0);
     for (var i = 0; i < profileTicks.length; i += 3) {
+      // TODO(observatory): Address is not necessarily representable as a JS
+      // integer.
       var address = int.parse(profileTicks[i], radix: 16);
-      var exclusive = int.parse(profileTicks[i + 1]);
-      var inclusive = int.parse(profileTicks[i + 2]);
+      var exclusive = profileTicks[i + 1];
+      var inclusive = profileTicks[i + 2];
       var tick = new CodeTick(exclusive, inclusive);
       addressTicks[address] = tick;
 
       var interval = code.findInterval(address);
       if (interval != null) {
         var intervalTick = intervalTicks[interval.start];
         if (intervalTick == null) {
           // Insert into map.
           intervalTick = new InlineIntervalTick(interval.start);
           intervalTicks[interval.start] = intervalTick;
@@ skipping 24 matching lines @@
       if (code.isOptimized) {
         attributes.add('optimized');
       } else {
         attributes.add('unoptimized');
       }
     } else if (code.kind == M.CodeKind.tag) {
       attributes.add('tag');
     } else if (code.kind == M.CodeKind.native) {
       attributes.add('native');
     }
-    inclusiveTicks = int.parse(data['inclusiveTicks']);
-    exclusiveTicks = int.parse(data['exclusiveTicks']);
+    inclusiveTicks = data['inclusiveTicks'];
+    exclusiveTicks = data['exclusiveTicks'];
 
     normalizedExclusiveTicks = exclusiveTicks / profile.sampleCount;
 
     normalizedInclusiveTicks = inclusiveTicks / profile.sampleCount;
 
     var ticks = data['ticks'];
     if (ticks != null) {
       _processTicks(ticks);
     }
 
@@ skipping 144 matching lines @@
 
   ProfileFunction.fromMap(this.profile, this.function, Map data) {
     function.profile = this;
     for (var codeIndex in data['codes']) {
       var profileCode = profile.codes[codeIndex];
       profileCodes.add(profileCode);
     }
     profileCodes.sort(_sortCodes);
 
     _addKindBasedAttributes(attributes);
-    exclusiveTicks = int.parse(data['exclusiveTicks']);
-    inclusiveTicks = int.parse(data['inclusiveTicks']);
+    exclusiveTicks = data['exclusiveTicks'];
+    inclusiveTicks = data['inclusiveTicks'];
 
     normalizedExclusiveTicks = exclusiveTicks / profile.sampleCount;
     normalizedInclusiveTicks = inclusiveTicks / profile.sampleCount;
 
     if (data.containsKey('exclusiveNativeAllocations') &&
         data.containsKey('inclusiveNativeAllocations')) {
       exclusiveNativeAllocations =
           int.parse(data['exclusiveNativeAllocations']);
       inclusiveNativeAllocations =
           int.parse(data['inclusiveNativeAllocations']);
@@ skipping 368 matching lines @@
   }
 
   int approximateMillisecondsForCount(count) {
     return (count * samplePeriod) ~/ Duration.MICROSECONDS_PER_MILLISECOND;
   }
 
   double approximateSecondsForCount(count) {
     return (count * samplePeriod) / Duration.MICROSECONDS_PER_SECOND;
   }
 }