Simplify timeline backend

runtime/vm/dart_api_impl.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 "include/dart_api.h"
 #include "include/dart_mirrors_api.h"
 #include "include/dart_native_api.h"
 
 #include "platform/assert.h"
 #include "vm/class_finalizer.h"
@@ skipping 5869 matching lines @@
   if (consumer == NULL) {
     return false;
   }
   TimelineEventRecorder* timeline_recorder = Timeline::recorder();
   if (timeline_recorder == NULL) {
     // Nothing has been recorded.
     return false;
   }
   Thread* T = Thread::Current();
   StackZone zone(T);
-  // Reclaim all blocks cached by isolate.
-  Timeline::ReclaimIsolateBlocks();
+  Timeline::ReclaimCachedBlocksFromThreads();
   JSONStream js;
   IsolateTimelineEventFilter filter(isolate);
   timeline_recorder->PrintTraceEvent(&js, &filter);
   const char* dart_events =
       DartTimelineEventIterator::PrintTraceEvents(timeline_recorder,
                                                   zone.GetZone(),
                                                   isolate);
   return StreamTraceEvents(consumer, user_data, &js, dart_events);
 }
 
 
 DART_EXPORT bool Dart_GlobalTimelineGetTrace(Dart_StreamConsumer consumer,
                                              void* user_data) {
   if (consumer == NULL) {
     return false;
   }
   TimelineEventRecorder* timeline_recorder = Timeline::recorder();
   if (timeline_recorder == NULL) {
     // Nothing has been recorded.
     return false;
   }
   Thread* T = Thread::Current();
   StackZone zone(T);
-  // Reclaim all blocks cached in the system.
-  Timeline::ReclaimAllBlocks();
+  Timeline::ReclaimCachedBlocksFromThreads();
   JSONStream js;
   TimelineEventFilter filter;
   timeline_recorder->PrintTraceEvent(&js, &filter);
   const char* dart_events =
       DartTimelineEventIterator::PrintTraceEvents(timeline_recorder,
                                                   zone.GetZone(),
                                                   NULL);
   return StreamTraceEvents(consumer, user_data, &js, dart_events);
 }
 
@@ skipping 162 matching lines @@
                                    ApiReallocate);
   writer.WriteFullSnapshot();
   *vm_isolate_snapshot_size = writer.VmIsolateSnapshotSize();
   *isolate_snapshot_size = writer.IsolateSnapshotSize();
   *instructions_snapshot_size = writer.InstructionsSnapshotSize();
 
   return Api::Success();
 }
 
 }  // namespace dart