Enable UMA reporting for crashpad_handler on macOS

chrome/app/chrome_crash_reporter_client_mac.mm

Index: chrome/app/chrome_crash_reporter_client_mac.mm
diff --git a/chrome/app/chrome_crash_reporter_client_mac.mm b/chrome/app/chrome_crash_reporter_client_mac.mm
index 03cf48b6bb40fc3112104f4433ba1972a211890b..d3a227bc5fe81121f940d2b29f3ee89fadf7005a 100644
--- a/chrome/app/chrome_crash_reporter_client_mac.mm
+++ b/chrome/app/chrome_crash_reporter_client_mac.mm
@@ -7,7 +7,9 @@
 #include <CoreFoundation/CoreFoundation.h>
 
 #include "base/mac/scoped_cftyperef.h"
+#include "base/path_service.h"
 #include "base/strings/sys_string_conversions.h"
+#include "chrome/common/chrome_paths.h"
 #include "components/policy/policy_constants.h"
 
 #if !defined(DISABLE_NACL)
@@ -17,6 +19,11 @@
 #include "native_client/src/trusted/service_runtime/osx/crash_filter.h"
 #endif
 
+bool ChromeCrashReporterClient::GetCrashMetricsLocation(
+    base::FilePath* metrics_dir) {
+  return PathService::Get(chrome::DIR_USER_DATA, metrics_dir);
+}
+
 bool ChromeCrashReporterClient::ReportingIsEnforcedByPolicy(
     bool* breakpad_enabled) {
   base::ScopedCFTypeRef<CFStringRef> key(