Report 'timeOriginMicros' and 'timeExtentMicros' in Timeline and Profile service responses

runtime/vm/profiler_service.cc

 // 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.
 
 #include "vm/profiler_service.h"
 
 #include "vm/growable_array.h"
 #include "vm/hash_map.h"
 #include "vm/log.h"
 #include "vm/native_symbol.h"
@@ skipping 2316 matching lines @@
 }
 
 
 void Profile::PrintHeaderJSON(JSONObject* obj) {
   obj->AddProperty("samplePeriod",
                    static_cast<intptr_t>(FLAG_profile_period));
   obj->AddProperty("stackDepth",
                    static_cast<intptr_t>(FLAG_max_profile_depth));
   obj->AddProperty("sampleCount", sample_count());
   obj->AddProperty("timeSpan", MicrosecondsToSeconds(GetTimeSpan()));
+  obj->AddPropertyTimeMicros("timeOriginMicros", min_time());
+  obj->AddPropertyTimeMicros("timeExtentMicros", GetTimeSpan());
 }
 
 
 void Profile::PrintTimelineFrameJSON(JSONObject* frames,
                                      ProfileTrieNode* current,
                                      ProfileTrieNode* parent,
                                      intptr_t* next_id) {
   ASSERT(current->frame_id() == -1);
   const intptr_t id = *next_id;
   *next_id = id + 1;
@@ skipping 399 matching lines @@
   // Disable thread interrupts while processing the buffer.
   DisableThreadInterruptsScope dtis(thread);
 
   ClearProfileVisitor clear_profile(isolate);
   sample_buffer->VisitSamples(&clear_profile);
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart