Add dsymutil as a mac cipd dependency.

The CL [1] switches to in-tree version of dsymutil, blocking the roll [2].
This CL instructs gclient tool to fetch the binary.

[1] https://chromium-review.googlesource.com/c/chromium/src/+/1500198
[2] https://webrtc-review.googlesource.com/c/src/+/125706/

Bug: chromium:780980
Change-Id: Ie4bb5b40157399b56ae4628ad3aa9cdbcc2cff5a
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/125840
Reviewed-by: Mirko Bonadei <mbonadei@webrtc.org>
Commit-Queue: Yves Gerey <yvesg@google.com>
Cr-Commit-Position: refs/heads/master@{#26981}
diff --git a/DEPS b/DEPS
index 0c53ced..e5e7a1c 100644
--- a/DEPS
+++ b/DEPS
@@ -75,6 +75,17 @@
   'src/buildtools/third_party/libunwind/trunk':
     Var('chromium_git') + '/external/llvm.org/libunwind.git' + '@' + '69d9b84cca8354117b9fe9705a4430d789ee599b',
 
+  'src/tools/clang/dsymutil': {
+    'packages': [
+      {
+        'package': 'chromium/llvm-build-tools/dsymutil',
+        'version': 'kykIT8m8YzNqqLP2xFGBTuo0ZtU9lom3BwiStWleyWkC',
+      }
+    ],
+    'condition': 'checkout_mac',
+    'dep_type': 'cipd',
+  },
+
   'src/third_party/android_ndk': {
       'url': Var('chromium_git') + '/android_ndk.git' + '@' + '4e2cea441bfd43f0863d14f57b1e1844260b9884',
       'condition': 'checkout_android',