Add chromium_clang_upload bot for Linux.

masters/master.tryserver.chromium.linux/master.cfg

Index: masters/master.tryserver.chromium.linux/master.cfg
diff --git a/masters/master.tryserver.chromium.linux/master.cfg b/masters/master.tryserver.chromium.linux/master.cfg
index 7bc4df0381cee9200cb60a9799416072d0b0a1da..20deb7c41318e380dd7c975e762c420a7ee908b5 100644
--- a/masters/master.tryserver.chromium.linux/master.cfg
+++ b/masters/master.tryserver.chromium.linux/master.cfg
@@ -230,6 +230,12 @@ chromium_builders.append({
   'slavebuilddir': 'build_and_upload_gn',
 })
 
+chromium_builders.append({
+  'name': 'linux_chromium_clang_upload',
+  'factory': m_annotator.BaseFactory('chromium_clang_upload'),
+  'slavebuilddir': 'build_and_upload_clang',
+})
+
 # Chromecast builders using chromium_trybot
 chromium_builders.extend([{
     'name': 'cast_shell_linux',