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

ppapi/shared_impl/ppb_trace_event_impl.h

Index: ppapi/shared_impl/ppb_trace_event_impl.h
diff --git a/ppapi/shared_impl/ppb_trace_event_impl.h b/ppapi/shared_impl/ppb_trace_event_impl.h
index 21a77acd6832bc1a4ed5da9764b2eeb0f6692f30..6df7cc8c15b252644eb1d9ec2fa7e29be96322d6 100644
--- a/ppapi/shared_impl/ppb_trace_event_impl.h
+++ b/ppapi/shared_impl/ppb_trace_event_impl.h
@@ -18,15 +18,29 @@ namespace ppapi {
 class PPAPI_SHARED_EXPORT TraceEventImpl {
  public:
   static void* GetCategoryEnabled(const char* category_name);
-  static void AddTraceEvent(int8_t phase,
-                               const void* category_enabled,
-                               const char* name,
-                               uint64_t id,
-                               uint32_t num_args,
-                               const char* arg_names[],
-                               const uint8_t arg_types[],
-                               const uint64_t arg_values[],
-                               uint8_t flags);
+  static void AddTraceEvent(
+      int8_t phase,
+      const void* category_enabled,
+      const char* name,
+      uint64_t id,
+      uint32_t num_args,
+      const char* arg_names[],
+      const uint8_t arg_types[],
+      const uint64_t arg_values[],
+      uint8_t flags);
+  static void AddTraceEventWithThreadIdAndTimestamp(
+      int8_t phase,
+      const void* category_enabled,
+      const char* name,
+      uint64_t id,
+      int32_t thread_id,
+      int64_t timestamp,
+      uint32_t num_args,
+      const char* arg_names[],
+      const uint8_t arg_types[],
+      const uint64_t arg_values[],
+      uint8_t flags);
+  static int64_t Now();
   static void SetThreadName(const char* thread_name);
 };