Use getSourceReport for coverage/callsites in Observatory.

runtime/vm/service.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/service.h"
 
 #include "include/dart_api.h"
 #include "include/dart_native_api.h"
 #include "platform/globals.h"
 
@@ skipping 2293 matching lines @@
   NULL,
 };
 
 
 static bool GetCoverage(Thread* thread, JSONStream* js) {
   // TODO(rmacnak): Remove this response; it is subsumed by GetCallSiteData.
   return GetHitsOrSites(thread, js, false);
 }
 
 
-static const char* kCallSitesStr = "CallSites";
+static const char* kCallSitesStr = "_CallSites";
 static const char* kCoverageStr = "Coverage";
 
 
 static const char* const report_enum_names[] = {
   kCallSitesStr,
   kCoverageStr,
   NULL,
 };
 
 
@@ skipping 1537 matching lines @@
     const ServiceMethodDescriptor& method = service_methods_[i];
     if (strcmp(method_name, method.name) == 0) {
       return &method;
     }
   }
   return NULL;
 }
 
 
 }  // namespace dart