Add support for async, metadata, and counter timeline events to be reported by the embedder

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/atomic.h"
 #include "vm/isolate.h"
 #include "vm/json_stream.h"
 #include "vm/lockers.h"
@@ skipping 361 matching lines @@
 }
 
 
 void TimelineEvent::End(const char* label,
                         int64_t micros) {
   Init(kEnd, label);
   set_timestamp0(micros);
 }
 
 
+void TimelineEvent::Counter(const char* label, int64_t micros) {
+  Init(kCounter, label);
+  set_timestamp0(micros);
+}
+
+
+void TimelineEvent::Metadata(const char* label, int64_t micros) {
+  Init(kMetadata, label);
+  set_timestamp0(micros);
+}
+
+
 void TimelineEvent::CompleteWithPreSerializedJSON(const char* json) {
   set_pre_serialized_json(true);
   SetNumArguments(1);
   CopyArgument(0, "Dart", json);
   Complete();
 }
 
 
 void TimelineEvent::SetNumArguments(intptr_t length) {
   // Cannot call this twice.
@@ skipping 178 matching lines @@
     case kAsyncInstant: {
       obj.AddProperty("ph", "n");
       obj.AddPropertyF("id", "%" Px64 "", AsyncId());
     }
     break;
     case kAsyncEnd: {
       obj.AddProperty("ph", "e");
       obj.AddPropertyF("id", "%" Px64 "", AsyncId());
     }
     break;
+    case kMetadata: {
+      obj.AddProperty("ph", "M");
+    }
+    break;
+    case kCounter: {
+      obj.AddProperty("ph", "C");
+    }
+    break;
     default:
       UNIMPLEMENTED();
   }
   {
     JSONObject args(&obj, "args");
     for (intptr_t i = 0; i < arguments_length_; i++) {
       const TimelineEventArgument& arg = arguments_[i];
       args.AddProperty(arg.name, arg.value);
     }
     if (isolate_id_ != ILLEGAL_PORT) {
@@ skipping 943 matching lines @@
 TimelineEventBlock* TimelineEventBlockIterator::Next() {
   ASSERT(current_ != NULL);
   TimelineEventBlock* r = current_;
   current_ = current_->next();
   return r;
 }
 
 #endif  // !PRODUCT
 
 }  // namespace dart