Add API to get the VM global timeline

runtime/include/dart_tools_api.h

 // Copyright (c) 2011, 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 INCLUDE_DART_TOOLS_API_H_
 #define INCLUDE_DART_TOOLS_API_H_
 
 #include "include/dart_api.h"
 
 /** \mainpage Dart Tools Embedding API Reference
@@ skipping 958 matching lines @@
  * \param consumer A Dart_StreamConsumer.
  * \param user_data User data passed into consumer.
  *
  * NOTE: The trace-event format is documented here: https://goo.gl/hDZw5M
  *
  * \return True if a stream was output.
  */
 DART_EXPORT bool Dart_TimelineGetTrace(Dart_StreamConsumer consumer,
                                        void* user_data);
 
+
+/**
+ * Get the timeline for entire VM (including all isolates).
+ *
+ * NOTE: The timeline retrieved from this API call may not include the most
+ * recent events.
+ *
+ * \param consumer A Dart_StreamConsumer.
+ * \param user_data User data passed into consumer.
+ *
+ * NOTE: The trace-event format is documented here: https://goo.gl/hDZw5M
+ *
+ * \return True if a stream was output.
+ */
+DART_EXPORT bool Dart_GlobalTimelineGetTrace(Dart_StreamConsumer consumer,
+                                             void* user_data);
+
 /**
  * Add a duration timeline event to the embedder stream for the current isolate.
  *
  * \param label The name of the event.
  * \param start_micros The start of the duration (in microseconds)
  * \param end_micros The end of the duration (in microseconds)
  *
  * NOTE: On Posix platforms you should use gettimeofday and on Windows platforms
  * you should use GetSystemTimeAsFileTime to get the time values.
  */
@@ skipping 57 matching lines @@
  * \return Returns an asynchronous id that must be passed to
  * Dart_TimelineAsyncInstant and Dart_TimelineAsyncEnd.
  *
  * NOTE: On Posix platforms this call uses gettimeofday and on Windows platforms
  * this call uses GetSystemTimeAsFileTime to get the current time.
  */
 DART_EXPORT Dart_Handle Dart_TimelineAsyncEnd(const char* label,
                                               int64_t async_id);
 
 #endif  // INCLUDE_DART_TOOLS_API_H_