Enable hermetic builds for FYI mac builders.

scripts/slave/recipe_modules/chromium_tests/chromium_mac.py

Index: scripts/slave/recipe_modules/chromium_tests/chromium_mac.py
diff --git a/scripts/slave/recipe_modules/chromium_tests/chromium_mac.py b/scripts/slave/recipe_modules/chromium_tests/chromium_mac.py
index f4d66614bcd321789c9ea45d57d6318b8caf13b5..7053f170cc1fe54b8d50e367f044d8b715ac74e4 100644
--- a/scripts/slave/recipe_modules/chromium_tests/chromium_mac.py
+++ b/scripts/slave/recipe_modules/chromium_tests/chromium_mac.py
@@ -20,6 +20,7 @@ SPEC = {
         'chrome_with_codecs',
         'mb',
         'ninja_confirm_noop',
+        'force_mac_toolchain',

[erikchen, 2016/05/03 16:48:57]

To start, let's move all the FYI bots over first, then when that lands and
sticks, we do these bots?

[justincohen, 2016/05/03 17:32:58]

done, reverted.

       ],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
@@ -38,7 +39,7 @@ SPEC = {
     },
     'Mac10.9 Tests': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['ninja_confirm_noop'],
+      'chromium_apply_config': ['ninja_confirm_noop', 'force_mac_toolchain'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
@@ -61,7 +62,7 @@ SPEC = {
     },
     'Mac10.10 Tests': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['ninja_confirm_noop'],
+      'chromium_apply_config': ['ninja_confirm_noop', 'force_mac_toolchain'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
@@ -83,7 +84,7 @@ SPEC = {
     },
     'Mac10.11 Tests': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['ninja_confirm_noop'],
+      'chromium_apply_config': ['ninja_confirm_noop', 'force_mac_toolchain'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
@@ -102,7 +103,7 @@ SPEC = {
     },
     'Mac GN': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb'],
+      'chromium_apply_config': ['mb', 'force_mac_toolchain'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Release',
@@ -120,7 +121,11 @@ SPEC = {
     },
     'Mac Builder (dbg)': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb', 'ninja_confirm_noop'],
+      'chromium_apply_config': [
+        'mb',
+        'ninja_confirm_noop',
+        'force_mac_toolchain'
+      ],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Debug',
@@ -138,7 +143,7 @@ SPEC = {
     },
     'Mac10.9 Tests (dbg)': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['ninja_confirm_noop'],
+      'chromium_apply_config': ['ninja_confirm_noop', 'force_mac_toolchain'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Debug',
@@ -161,7 +166,7 @@ SPEC = {
     },
     'Mac GN (dbg)': {
       'chromium_config': 'chromium',
-      'chromium_apply_config': ['mb'],
+      'chromium_apply_config': ['mb', 'force_mac_toolchain'],
       'gclient_config': 'chromium',
       'chromium_config_kwargs': {
         'BUILD_CONFIG': 'Debug',