Use Chromium mirror of tools/perf.

This will keep ANGLE in sync with Chromium changes and reduce the
maintenance burden.

Bug: angleproject:6037
Change-Id: Ibed4031d8cb3468e6be6501bda21404c42fb2be6
Reviewed-on: https://chromium-review.googlesource.com/c/angle/angle/+/2953043
Reviewed-by: Yuly Novikov <ynovikov@chromium.org>
diff --git a/DEPS b/DEPS
index 5ce76c4..b158926 100644
--- a/DEPS
+++ b/DEPS
@@ -573,6 +573,11 @@
     'condition': 'not build_with_chromium',
   },
 
+  'tools/perf': {
+    'url': '{chromium_git}/chromium/src/tools/perf@5c84710692637a3b3618e88b7d145b2189da71c9',
+    'condition': 'not build_with_chromium',
+  },
+
   'tools/protoc_wrapper': {
     'url': '{chromium_git}/chromium/src/tools/protoc_wrapper@57697a9873d45b2d19117eb76fbf327ba2288095',
     'condition': 'not build_with_chromium',