Add TimelinePauses analysis and tests

runtime/vm/timeline.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 <cstdlib>
 
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
 #include "vm/lockers.h"
 #include "vm/object.h"
@@ skipping 628 matching lines @@
       if (!event->IsValid()) {
         continue;
       }
       events->AddValue(event);
     }
     current = current->next();
   }
 }
 
 
+void TimelineEventEndlessRecorder::Clear() {
+  TimelineEventBlock* current = head_;
+  while (current != NULL) {
+    TimelineEventBlock* next = current->next();
+    delete current;
+    current = next;
+  }
+  head_ = NULL;
+  block_index_ = 0;
+  Thread* thread = Thread::Current();
+  thread->set_timeline_block(NULL);
+}
+
+
 TimelineEventBlock::TimelineEventBlock(intptr_t block_index)
     : next_(NULL),
       length_(0),
       block_index_(block_index) {
 }
 
 
 TimelineEventBlock::~TimelineEventBlock() {
   Reset();
 }
@@ skipping 89 matching lines @@
 
 
 TimelineEventBlock* TimelineEventBlockIterator::Next() {
   ASSERT(current_ != NULL);
   TimelineEventBlock* r = current_;
   current_ = current_->next();
   return r;
 }
 
 }  // namespace dart