Run tests that do not have any compile targets if source files change.

scripts/slave/recipes/chromium_trybot.py

Index: scripts/slave/recipes/chromium_trybot.py
diff --git a/scripts/slave/recipes/chromium_trybot.py b/scripts/slave/recipes/chromium_trybot.py
index 3a5cf04dcc2237ef90459640e607ef135883d578..6b98c1cee3ef177b443c027a2cd924f3ee381e49 100644
--- a/scripts/slave/recipes/chromium_trybot.py
+++ b/scripts/slave/recipes/chromium_trybot.py
@@ -453,6 +453,11 @@ def all_compile_targets(api, tests):
                     for test in tests
                     for x in test.compile_targets(api)))
 
+def is_source_file(api, filepath):
+  """Returns true iff the file is a source file."""
+  _, ext = api.path.splitext(filepath)
+  return ext in ['.c', '.cc', '.cpp', '.h', '.java', '.mm']
+
 
 def _RunStepsInternal(api):
   def get_bot_config(mastername, buildername):
@@ -556,21 +561,25 @@ def _RunStepsInternal(api):
     # trying to isolate the tests. Also see above comment.
     compile_targets = sorted(set(compile_targets + matching_exes))
 
-  if not requires_compile:
-    return
-
-  tests = tests_in_compile_targets(api, matching_exes, tests)
-  tests_including_triggered = tests_in_compile_targets(
-      api, matching_exes, tests_including_triggered)
+  if requires_compile:
+    tests = tests_in_compile_targets(api, matching_exes, tests)
+    tests_including_triggered = tests_in_compile_targets(
+        api, matching_exes, tests_including_triggered)
 
-  api.chromium_tests.compile_specific_targets(
-      bot_config['mastername'],
-      bot_config['buildername'],
-      bot_update_step,
-      master_dict,
-      compile_targets,
-      tests_including_triggered,
-      override_bot_type='builder_tester')
+    api.chromium_tests.compile_specific_targets(
+        bot_config['mastername'],
+        bot_config['buildername'],
+        bot_update_step,
+        master_dict,
+        compile_targets,
+        tests_including_triggered,
+        override_bot_type='builder_tester')
+  else:
+    # Even though the patch doesn't compile on this platform, we'd still like
+    # to run tests not depending on compiled targets (that's obviously not
+    # covered by the 'analyze' step) if any source files change.
+    if any([is_source_file(api, f) for f in affected_files]):
+      tests = [t for t in tests if not t.compile_targets(api)]
 
   if not tests:
     return