[Fuchsia] Routes timeline events to Fuchsia's tracing app

runtime/vm/timeline.h

 // 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.
 
 #ifndef RUNTIME_VM_TIMELINE_H_
 #define RUNTIME_VM_TIMELINE_H_
 
 #include "include/dart_tools_api.h"
 
 #include "vm/allocation.h"
@@ skipping 300 matching lines @@
 
   const char* GetSerializedJSON() const;
 
   void set_owns_label(bool owns_label) {
     state_ = OwnsLabelBit::update(owns_label, state_);
   }
 
   // Returns the number of bytes written into |buffer|.
   intptr_t PrintSystrace(char* buffer, intptr_t buffer_size);
 
+#if defined(HOST_OS_FUCHSIA)
+  void EmitFuchsiaEvent();
+#endif
+
  private:
   void FreeArguments();
 
   void StreamInit(TimelineStream* stream);
   void Init(EventType event_type, const char* label);
 
   void set_event_type(EventType event_type) {
     // We only reserve 4 bits to hold the event type.
     COMPILE_ASSERT(kNumEventTypes < 16);
     state_ = EventTypeField::update(event_type, state_);
@@ skipping 95 matching lines @@
   TimelineEventScope(TimelineStream* stream, const char* label);
 
   TimelineEventScope(Thread* thread, TimelineStream* stream, const char* label);
 
   bool ShouldEmitEvent() const { return enabled_; }
 
   void set_enabled(bool enabled) { enabled_ = enabled; }
 
   const char* label() const { return label_; }
 
+  TimelineEventArgument* arguments() const { return arguments_; }
+
+  intptr_t arguments_length() const { return arguments_length_; }
+
   TimelineStream* stream() const { return stream_; }
 
   virtual ~TimelineEventScope();
 
   void StealArguments(TimelineEvent* event);
 
  private:
   void Init();
   void FreeArguments();
 
@@ skipping 374 matching lines @@
 
  private:
   TimelineEventBlock* current_;
   TimelineEventRecorder* recorder_;
 };
 
 
 }  // namespace dart
 
 #endif  // RUNTIME_VM_TIMELINE_H_