Refactor some Timeline interfaces to be simpler and support streaming

runtime/vm/deopt_instructions.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/deopt_instructions.h"
 
 #include "vm/assembler.h"
 #include "vm/code_patcher.h"
 #include "vm/compiler.h"
 #include "vm/intermediate_language.h"
@@ skipping 82 matching lines @@
     }
     dest_frame_is_allocated_ = true;
   }
 
   if (dest_options != kDestIsAllocated) {
     // kDestIsAllocated is used by the debugger to generate a stack trace
     // and does not signal a real deopt.
     Isolate* isolate = Isolate::Current();
     TimelineStream* compiler_stream = isolate->GetCompilerStream();
     ASSERT(compiler_stream != NULL);
-    timeline_event_ = compiler_stream->RecordEvent();
+    timeline_event_ = compiler_stream->StartEvent();
     if (timeline_event_ != NULL) {
-      timeline_event_->DurationBegin(compiler_stream, "Deoptimize");
+      timeline_event_->DurationBegin("Deoptimize");
       timeline_event_->SetNumArguments(3);
     }
   }
 
   if (FLAG_trace_deoptimization || FLAG_trace_deoptimization_verbose) {
     OS::PrintErr(
         "Deoptimizing (reason %d '%s') at pc %#" Px " '%s' (count %d)\n",
         deopt_reason(),
         DeoptReasonToCString(deopt_reason()),
         frame->pc(),
@@ skipping 35 matching lines @@
     timeline_event_->CopyArgument(
         1,
         "reason",
         const_cast<char*>(DeoptReasonToCString(deopt_reason())));
     timeline_event_->FormatArgument(
         2,
         "deoptimizationCount",
         "%d",
         function.deoptimization_counter());
     timeline_event_->DurationEnd();
+    timeline_event_->Complete();
   }
 }
 
 
 void DeoptContext::VisitObjectPointers(ObjectPointerVisitor* visitor) {
   visitor->VisitPointer(reinterpret_cast<RawObject**>(&object_pool_));
   visitor->VisitPointer(reinterpret_cast<RawObject**>(&deopt_info_));
 
   // Visit any object pointers on the destination stack.
   if (dest_frame_is_allocated_) {
@@ skipping 1122 matching lines @@
                           Smi* offset,
                           TypedData* info,
                           Smi* reason) {
   intptr_t i = index * kEntrySize;
   *offset ^= table.At(i);
   *info ^= table.At(i + 1);
   *reason ^= table.At(i + 2);
 }
 
 }  // namespace dart