Support --gtest_filter for try jobs.

buildbot/scripts/master/factory/commands.py

Index: buildbot/scripts/master/factory/commands.py
===================================================================
--- buildbot/scripts/master/factory/commands.py	(revision 46112)
+++ buildbot/scripts/master/factory/commands.py	(working copy)
@@ -151,6 +151,23 @@
       cmd.extend(arg_list)
     return cmd
 
+  @staticmethod
+  def DoStepFilterTest(bStep):
+    """Examines the 'testfilters' property of the build and determines if
+    the step should run; True for yes."""
+    try:
+      filters = bStep.getProperty('testfilters')
+    except:
+      return True
+
+    for filter in filters:
+      if filter == bStep.name:
+        return True
+      if filter.startswith(("%s:" % bStep.name)):
+        bStep.command.append("--gtest_filter=%s" % filter.split(':',1)[1])
+        return True
+    return False
+
   def AddTestStep(self, command_class, test_name, test_command,
                   test_description='', timeout=600, workdir=None, env=None,
                   locks=None, halt_on_failure=False):
@@ -175,10 +192,15 @@
       locks: any locks to acquire for this test
       halt_on_failure: whether the current build should halt if this step fails
     """
+    doStepCondition = True
+    if command_class == gtest_command.GTestCommand:
+      doStepCondition = self.DoStepFilterTest
+
     self._factory.addStep(
         command_class,
         name=test_name,
         timeout=timeout,
+        doStepIf=doStepCondition,
         workdir=workdir,
         env=env,
         # TODO(bradnelson): FIXME