Add Clang ToT builder for iOS

scripts/slave/recipe_modules/chromium/chromium_fyi.py

Index: scripts/slave/recipe_modules/chromium/chromium_fyi.py
diff --git a/scripts/slave/recipe_modules/chromium/chromium_fyi.py b/scripts/slave/recipe_modules/chromium/chromium_fyi.py
index 7893ad2603939307ac2c39f69b4762e6725c8ce0..c6d5080472fc03bfd1ff19a41aa11de196381adc 100644
--- a/scripts/slave/recipe_modules/chromium/chromium_fyi.py
+++ b/scripts/slave/recipe_modules/chromium/chromium_fyi.py
@@ -1193,6 +1193,28 @@ SPEC = {
       'testing': { 'platform': 'mac', },
       'enable_swarming': True,
     },
+    'ClangToTiOS': {
+      'chromium_config': 'clang_tot_ios',
+      'gclient_config': 'ios',
+      'chromium_config_kwargs': {
+        'BUILD_CONFIG': 'Release',
+        'TARGET_PLATFORM': 'ios',
+        'TARGET_BITS': 32,
+      },
+      'gclient_config_kwargs': {
+        'GIT_MODE': True,
+      },
+      'GYP_DEFINES': {
+        'werror': '',
+        # Plugin flags often need to be changed when using a plugin newer than
+        # the latest Clang package, so disable plugins.
+        'clang_use_chrome_plugins': '0',
+      },
+      'testing': {
+        'platform': 'mac',
+      }
+    },

[smut, 2015/05/18 23:00:05]

ios/unified_builder_tester is just going to ignore all this. Please configure
this builder by looking here:
https://chromium.googlesource.com/chromium/src/+/master/ios/build/bots/chromi...

[hans, 2015/05/18 23:31:30]

But scripts/slave/recipes/chromium.expected/full_chromium_fyi_ClangToTiOS.json
looks like it got configured correctly, but that one isn't used?

I'll prepare a patch.

[smut, 2015/05/19 00:07:29]

full_chromium_fyi_ClangToTiOS.json is not the expectation for a bot using
ios/unified_builder_tester. The expectations for ios/unified_builder_tester are
located at scripts/slave/recipes/ios/unified_builder_tester.expected/.

+
     'Linux Builder (clobber)': {
       'chromium_config': 'chromium',
       'gclient_config': 'chromium',
@@ -1211,7 +1233,6 @@ SPEC = {
         'platform': 'linux',
       },
     },
-
     'Android Tests (trial)(dbg)': {
       'chromium_config': 'android',
       'gclient_config': 'chromium',