mb: Enable goma and minimal_symbols for perf.fyi Win Clang Builder

BUG=649539

Review-Url: https://codereview.chromium.org/2371953002
Cr-Commit-Position: refs/heads/master@{#421280}

tools/mb/mb_config.pyl

@@ -298,7 +298,7 @@
 
     'chromium.perf.fyi': {
       'Win Builder': 'official_goma',
-      'Win Clang Builder': 'official_clang',
+      'Win Clang Builder': 'official_goma_minimal_symbols_clang',
     },
 
     'client.nacl.sdk': {
@@ -1203,6 +1203,10 @@
       'clang', 'official',
     ],
 
+    'official_goma_minimal_symbols_clang': [
+      'official', 'goma', 'minimal_symbols', 'clang',
+    ],
+
     'official_clang_x86': [
       'clang', 'official', 'x86',
     ],