Enable UMA reporting for crashpad_handler on macOS

chrome/app/chrome_crash_reporter_client.h

Index: chrome/app/chrome_crash_reporter_client.h
diff --git a/chrome/app/chrome_crash_reporter_client.h b/chrome/app/chrome_crash_reporter_client.h
index b6f256ff97721b4fa49852f717fb2ce472aba3c1..2d42b87fcc3641e1954c49510d7dacca453c955b 100644
--- a/chrome/app/chrome_crash_reporter_client.h
+++ b/chrome/app/chrome_crash_reporter_client.h
@@ -35,6 +35,10 @@ class ChromeCrashReporterClient : public crash_reporter::CrashReporterClient {
 
   bool GetCrashDumpLocation(base::FilePath* crash_dir) override;
 
+#if defined(OS_MACOSX)
+  bool GetCrashMetricsLocation(base::FilePath* metrics_dir) override;
+#endif
+
   size_t RegisterCrashKeys() override;
 
   bool IsRunningUnattended() override;