win: Set is_clang=true by default.

tools/mb/mb_config.pyl

Index: tools/mb/mb_config.pyl
diff --git a/tools/mb/mb_config.pyl b/tools/mb/mb_config.pyl
index 57e79d710b8059158bd58bdc7d2162a3f01a46df..07e26d69bbc662763ab018db13f4e59f9b1bb667 100644
--- a/tools/mb/mb_config.pyl
+++ b/tools/mb/mb_config.pyl
@@ -1500,7 +1500,10 @@
     ],
 
     'win_clang_debug_bot': [
-      'clang', 'debug_bot', 'minimal_symbols',
+      # TODO(thakis): Now that the default win bots uss clang, use win_clang

[hans, 2017/05/15 17:22:43]

s/uss/use/

+      # to make sure things stay compilable with msvc. Having "win_clang"
+      # check that is very confusing, so rename the bot to win_msvc.
+      'no_clang', 'debug_bot', 'minimal_symbols',
     ],
 
     'windows_analyze': [
@@ -1590,11 +1593,11 @@
     },
 
     'chrome_pgo_phase_1': {
-      'gn_args': 'chrome_pgo_phase=1',
+      'gn_args': 'chrome_pgo_phase=1 is_clang=false',
     },
 
     'chrome_pgo_phase_2': {
-      'gn_args': 'chrome_pgo_phase=2',
+      'gn_args': 'chrome_pgo_phase=2 is_clang=false',
     },
 
     'chrome_with_codecs': {
@@ -1622,6 +1625,10 @@
       'gn_args': 'is_clang=true',
     },
 
+    'no_clang': {
+      'gn_args': 'is_clang=true',

[Nico, 2017/05/17 22:27:48]

whooooooooops

[hans, 2017/05/17 22:36:45]

But it said no_clang on the tin!

+    },
+
     'cronet': {
       'gn_args': ('disable_file_support=true disable_ftp_support=true '
                   'enable_websockets=false use_platform_icu_alternatives=true '
@@ -1869,7 +1876,8 @@
     },
 
     'syzyasan': {
-      'gn_args': 'is_syzyasan=true',
+      # TODO(thakis): Figure out SyzyASan + clang story.
+      'gn_args': 'is_syzyasan=true is_clang=false',
     },
 
     'thin_lto': {