Provides a second version of addTraceEvent that accepts a timestamp. This is in preparation for the…

content/child/blink_platform_impl.h

Index: content/child/blink_platform_impl.h
diff --git a/content/child/blink_platform_impl.h b/content/child/blink_platform_impl.h
index be860e635cca7cf7f0a96dba28d07cd06263ee7d..25e6826954d57b5c08e642b67985ca8854ee70c7 100644
--- a/content/child/blink_platform_impl.h
+++ b/content/child/blink_platform_impl.h
@@ -104,6 +104,31 @@ class CONTENT_EXPORT BlinkPlatformImpl
       const unsigned char* category_group_enabled,
       const char* name,
       unsigned long long id,
+      double timestamp,
+      int num_args,
+      const char** arg_names,
+      const unsigned char* arg_types,
+      const unsigned long long* arg_values,
+      unsigned char flags);
+  virtual TraceEventHandle addTraceEvent(
+      char phase,
+      const unsigned char* category_group_enabled,
+      const char* name,
+      unsigned long long id,
+      double timestamp,
+      int num_args,
+      const char** arg_names,
+      const unsigned char* arg_types,
+      const unsigned long long* arg_values,
+      const blink::WebConvertableToTraceFormat* convertable_values,
+      unsigned char flags);
+  // TODO(charliea): Remove the addTraceEvent methods without timestamps
+  // once Blink uses the new signature with timestamps
+  virtual TraceEventHandle addTraceEvent(
+      char phase,
+      const unsigned char* category_group_enabled,
+      const char* name,
+      unsigned long long id,
       int num_args,
       const char** arg_names,
       const unsigned char* arg_types,