Make sharding_supervisor.py run InProcessBrowserTest.Empty

content/test/test_launcher.cc

Index: content/test/test_launcher.cc
===================================================================
--- content/test/test_launcher.cc	(revision 139574)
+++ content/test/test_launcher.cc	(working copy)
@@ -446,9 +446,9 @@
       test_name.append(".");
       test_name.append(test_info->name());
 
-      // Skip our special test so it's not run twice. That confuses
-      // the log parser.
-      if (test_name == kEmptyTestName)
+      // Skip our special test so it's not run twice, unless it's the only test
+      // being run, to avoid confusing the log parser.
+      if (test_name == kEmptyTestName && positive_filter != kEmptyTestName)
         continue;
 
       // Skip disabled tests.