Add events with custom timestamps and thread id to PPAPI dev tracing interface.

ppapi/api/dev/ppb_trace_event_dev.idl

Index: ppapi/api/dev/ppb_trace_event_dev.idl
diff --git a/ppapi/api/dev/ppb_trace_event_dev.idl b/ppapi/api/dev/ppb_trace_event_dev.idl
index ff01dea32859d6a62fa476a5b4b4b31d6a3556f5..bbe41d9973a7002274fd287f3a7da899a74cb1da 100644
--- a/ppapi/api/dev/ppb_trace_event_dev.idl
+++ b/ppapi/api/dev/ppb_trace_event_dev.idl
@@ -9,7 +9,8 @@
  */
 
 label Chrome {
-  M25 = 0.1
+  M25 = 0.1,
+  M29 = 0.2
 };
 
 interface PPB_Trace_Event_Dev {
@@ -43,6 +44,27 @@ interface PPB_Trace_Event_Dev {
       [in] uint8_t flags);
 
   /**
+   * Adds a trace event to the platform tracing system. This function call is
+   * usually the result of a TRACE_* macro from trace_event.h when tracing and
+   * the category of the particular trace are enabled. It is not advisable to
+   * call this function on its own; it is really only meant to be used by the
+   * trace macros.
+   */
+  [version=0.2]
+  void AddTraceEventWithThreadIdAndTimestamp(
+      [in] int8_t phase,
+      [in] mem_t category_enabled,
+      [in] cstr_t name,
+      [in] uint64_t id,
+      [in] int32_t thread_id,
+      [in] int64_t timestamp,
+      [in] uint32_t num_args,
+      [in, size_as=num_args] str_t[] arg_names,
+      [in, size_as=num_args] uint8_t[] arg_types,
+      [in, size_as=num_args] uint64_t[] arg_values,
+      [in] uint8_t flags);
+
+  /**
    * Sets the thread name of the calling thread in the tracing system so it will
    * show up properly in chrome://tracing.
    */