[observatory] Sort native allocation profiles by size.

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 86 matching lines @@
     }
     if (inclusive) {
       node._percentage =
           parentPercentage * (node.inclusiveNativeAllocations / parentMemory);
     } else {
       node._percentage = (node.inclusiveNativeAllocations / parentMemory);
     }
     for (var child in node.children) {
       _setCodeMemoryPercentage(node, child);
     }
+    node.children.sort((a, b) {
+      return b.inclusiveNativeAllocations - a.inclusiveNativeAllocations;
+    });
   }
 
   _recordCallerAndCalleesInner(
       CodeCallTreeNode caller, CodeCallTreeNode callee) {
     if (caller != null) {
       caller.profileCode._recordCallee(callee.profileCode, callee.count);
       callee.profileCode._recordCaller(caller.profileCode, caller.count);
     }
 
     for (var child in callee.children) {
@@ skipping 292 matching lines @@
     }
     if (inclusive) {
       node._percentage =
           parentPercentage * (node.inclusiveNativeAllocations / parentMemory);
     } else {
       node._percentage = (node.inclusiveNativeAllocations / parentMemory);
     }
     for (var child in node.children) {
       _setFunctionMemoryPercentage(node, child);
     }
+    node.children.sort((a, b) {
+      return b.inclusiveNativeAllocations - a.inclusiveNativeAllocations;
+    });
   }
 
   _markFunctionCallsInner(
       FunctionCallTreeNode caller, FunctionCallTreeNode callee) {
     if (caller != null) {
       caller.profileFunction
           ._recordCallee(callee.profileFunction, callee.count);
       callee.profileFunction
           ._recordCaller(caller.profileFunction, caller.count);
     }
@@ skipping 646 matching lines @@
   }
 
   int approximateMillisecondsForCount(count) {
     return (count * samplePeriod) ~/ Duration.MICROSECONDS_PER_MILLISECOND;
   }
 
   double approximateSecondsForCount(count) {
     return (count * samplePeriod) / Duration.MICROSECONDS_PER_SECOND;
   }
 }