Move check for existence of generated tests from run-tests.py to presubmit.py

tools/presubmit.py

Index: tools/presubmit.py
diff --git a/tools/presubmit.py b/tools/presubmit.py
index 7961156b7ae8b5a8f3b123efabcd4343079c3931..a4ca39980522fbdbfe40527b90cd825520ceec62 100755
--- a/tools/presubmit.py
+++ b/tools/presubmit.py
@@ -306,7 +306,8 @@ class SourceProcessor(SourceFileProcessor):
           if self.IgnoreDir(dir_part):
             break
         else:
-          if self.IsRelevant(file) and not self.IgnoreFile(file):
+          if (self.IsRelevant(file) and os.path.exists(file)
+              and not self.IgnoreFile(file)):
             result.append(join(path, file))
       if output.wait() == 0:
         return result
@@ -416,6 +417,13 @@ class SourceProcessor(SourceFileProcessor):
     return success
 
 
+def CheckGeneratedRuntimeTests(workspace):
+  code = subprocess.call(
+      [sys.executable, join(workspace, "tools", "generate-runtime-tests.py"),
+       "check"])
+  return code == 0
+
+
 def GetOptions():
   result = optparse.OptionParser()
   result.add_option('--no-lint', help="Do not run cpplint", default=False,
@@ -434,6 +442,7 @@ def Main():
   print "Running copyright header, trailing whitespaces and " \
         "two empty lines between declarations check..."
   success = SourceProcessor().Run(workspace) and success
+  success = CheckGeneratedRuntimeTests(workspace) and success
   if success:
     return 0
   else: