- Write the coverage data to a file instead of printing to stdout.

runtime/vm/isolate.cc

 // Copyright (c) 2013, 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.
 
 #include "vm/isolate.h"
 
 #include "include/dart_api.h"
 #include "platform/assert.h"
 #include "platform/json.h"
 #include "lib/mirrors.h"
@@ skipping 767 matching lines @@
     // Fail fast if anybody tries to post any more messsages to this isolate.
     delete message_handler();
     set_message_handler(NULL);
 
     // Dump all accumalated timer data for the isolate.
     timer_list_.ReportTimers();
     if (FLAG_report_usage_count) {
       PrintInvokedFunctions();
     }
 
-    if (FLAG_print_coverage) {
-      CodeCoverage::Print(this);
-    }
+    // Write out the coverage data if collection has been enabled.
+    CodeCoverage::Write(this);
 
     // Finalize any weak persistent handles with a non-null referent.
     FinalizeWeakPersistentHandlesVisitor visitor;
     api_state()->weak_persistent_handles().VisitHandles(&visitor);
 
     CompilerStats::Print();
     // TODO(asiva): Move this code to Dart::Cleanup when we have that method
     // as the cleanup for Dart::InitOnce.
     CodeObservers::DeleteAll();
     if (FLAG_trace_isolates) {
@@ skipping 387 matching lines @@
   return func.raw();
 }
 
 
 void IsolateSpawnState::Cleanup() {
   SwitchIsolateScope switch_scope(isolate());
   Dart::ShutdownIsolate();
 }
 
 }  // namespace dart