Refactor some Timeline interfaces to be simpler and support streaming

runtime/vm/dart.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/dart.h"
 
 #include "vm/code_observers.h"
 #include "vm/cpu.h"
 #include "vm/dart_api_state.h"
 #include "vm/dart_entry.h"
@@ skipping 307 matching lines @@
   ServiceIsolate::SendIsolateStartupMessage();
   isolate->debugger()->NotifyIsolateCreated();
 
   // Create tag table.
   isolate->set_tag_table(
       GrowableObjectArray::Handle(GrowableObjectArray::New()));
   // Set up default UserTag.
   const UserTag& default_tag = UserTag::Handle(UserTag::DefaultTag());
   isolate->set_current_tag(default_tag);
 
-  isolate->SetTimelineEventBuffer(new TimelineEventBuffer());
+  isolate->SetTimelineEventRecorder(new TimelineEventRingRecorder());
 
   if (FLAG_keep_code) {
     isolate->set_deoptimized_code_array(
       GrowableObjectArray::Handle(GrowableObjectArray::New()));
   }
   return Error::null();
 }
 
 
 void Dart::RunShutdownCallback() {
@@ skipping 20 matching lines @@
   return predefined_handles_->handles_.AllocateScopedHandle();
 }
 
 
 bool Dart::IsReadOnlyHandle(uword address) {
   ASSERT(predefined_handles_ != NULL);
   return predefined_handles_->handles_.IsValidScopedHandle(address);
 }
 
 }  // namespace dart