Support narrowing a cpu profile to a given time window

runtime/vm/profiler_service.h

 // 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.
 
 #ifndef VM_PROFILER_SERVICE_H_
 #define VM_PROFILER_SERVICE_H_
 
 #include "vm/allocation.h"
 #include "vm/code_observers.h"
 #include "vm/globals.h"
@@ skipping 378 matching lines @@
 
 class ProfilerService : public AllStatic {
  public:
   enum {
     kNoExtraTags = 0,
     kCodeTransitionTagsBit = (1 << 0),
   };
 
   static void PrintJSON(JSONStream* stream,
                         Profile::TagOrder tag_order,
-                        intptr_t extra_tags);
+                        intptr_t extra_tags,
+                        int64_t time_origin_micros,
+                        int64_t time_extent_micros);
 
   static void PrintAllocationJSON(JSONStream* stream,
                                   Profile::TagOrder tag_order,
-                                  const Class& cls);
+                                  const Class& cls,
+                                  int64_t time_origin_micros,
+                                  int64_t time_extent_micros);
 
   static void PrintTimelineJSON(JSONStream* stream,
-                                Profile::TagOrder tag_order);
+                                Profile::TagOrder tag_order,
+                                int64_t time_origin_micros,
+                                int64_t time_extent_micros);
 
   static void ClearSamples();
 
  private:
   static void PrintJSONImpl(Thread* thread,
                             JSONStream* stream,
                             Profile::TagOrder tag_order,
                             intptr_t extra_tags,
                             SampleFilter* filter,
                             bool as_timline);
 };
 
 }  // namespace dart
 
 #endif  // VM_PROFILER_SERVICE_H_