Add ScopedAllow event args to trace arguments whitelist

Accept the src_func and src_file for the ScopedAllow events.

Follow-up on this CL:
  https://chromium-review.googlesource.com/c/chromium/src/+/2031440

R=gab@chromium.org, oysteine@chromium.org

Bug: 1047794
Change-Id: I0d00ad7121dbc9e7d464fe3b2c915951b77f0699
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2057287Reviewed-by: oysteine <oysteine@chromium.org>
Reviewed-by: Gabriel Charette <gab@chromium.org>
Commit-Queue: Etienne Bergeron <etienneb@chromium.org>
Cr-Commit-Position: refs/heads/master@{#741607}

services/tracing/public/cpp/trace_event_args_whitelist.cc

@@ -52,6 +52,10 @@ const WhitelistEntry kEventArgsWhitelist[] = {
     {"__metadata", "chrome_library_module", nullptr},
     {"__metadata", "stackFrames", nullptr},
     {"__metadata", "typeNames", nullptr},
+    {"base", "ScopedAllowBaseSyncPrimitivesOutsideBlockingScope",
+     kScopedBlockingCallAllowedArgs},
+    {"base", "ScopedAllowBlocking", kScopedBlockingCallAllowedArgs},
+    {"base", "ScopedAllowIO", kScopedBlockingCallAllowedArgs},
     {"base", "ScopedBlockingCall*", kScopedBlockingCallAllowedArgs},
     {"base", "ScopedMayLoadLibraryAtBackgroundPriority",
      kScopedBlockingCallAllowedArgs},