GN: take over CommandBuffer bot

infra/bots/recipe_modules/flavor/gn_flavor.py

Index: infra/bots/recipe_modules/flavor/gn_flavor.py
diff --git a/infra/bots/recipe_modules/flavor/gn_flavor.py b/infra/bots/recipe_modules/flavor/gn_flavor.py
index c91de14b09326bf7abf405a45100d4e3e862ba40..81aa1216ac5e4a849667387c4ffea3aba7b4fc4e 100644
--- a/infra/bots/recipe_modules/flavor/gn_flavor.py
+++ b/infra/bots/recipe_modules/flavor/gn_flavor.py
@@ -14,6 +14,7 @@ class GNFlavorUtils(default_flavor.DefaultFlavorUtils):
     return any([
       'CT' in extra_config,
       'SAN' in extra_config,
+      extra_config == 'CommandBuffer',
       extra_config == 'Fast',
       extra_config == 'GN',
       extra_config == 'Mesa',
@@ -29,6 +30,15 @@ class GNFlavorUtils(default_flavor.DefaultFlavorUtils):
     self.m.run(self.m.step, title, cmd=cmd,
                env=env, cwd=self.m.vars.skia_dir, infra_step=infra_step)
 
+  def build_command_buffer(self):
+    self.m.run(self.m.python, 'build command_buffer',
+        script=self.m.vars.skia_dir.join('tools', 'build_command_buffer.py'),
+        args=[
+          '--chrome-dir', self.m.vars.checkout_root,
+          '--output-dir', self.m.vars.skia_out.join(self.m.vars.configuration),
+          '--chrome-build-type', self.m.vars.configuration,
+          '--no-sync', '--make-output-dir'])
+
   def compile(self, unused_target, **kwargs):
     """Build Skia with GN."""
     compiler      = self.m.vars.builder_cfg.get('compiler',      '')
@@ -63,6 +73,8 @@ class GNFlavorUtils(default_flavor.DefaultFlavorUtils):
 
     if configuration != 'Debug':
       args['is_debug'] = 'false'
+    if extra_config == 'CommandBuffer':
+      self.m.run.run_once(self.build_command_buffer)
     if extra_config == 'MSAN':
       args['skia_use_fontconfig'] = 'false'
     if extra_config == 'Mesa':