Run pydeps check only in src.

Bug: 803245
Change-Id: I645e82663991cd012ced5f19a056d08bbc2c797d
Reviewed-on: https://chromium-review.googlesource.com/952281
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Commit-Queue: Zhiling Huang <hzl@chromium.org>
Cr-Commit-Position: refs/heads/master@{#542297}

diff --git a/PRESUBMIT_test_mocks.py b/PRESUBMIT_test_mocks.py
index 732da0e..846f8413 100644
--- a/PRESUBMIT_test_mocks.py
+++ b/PRESUBMIT_test_mocks.py

@@ -51,6 +51,7 @@
 
     return errors
 
+
 class MockInputApi(object):
   """Mock class for the InputApi class.
 
@@ -75,6 +76,9 @@
     self.change = MockChange([])
     self.presubmit_local_path = os.path.dirname(__file__)
 
+  def CreateMockFileInPath(self, f_list):
+    self.os_path.exists = lambda x: x in f_list
+
   def AffectedFiles(self, file_filter=None, include_deletes=False):
     for file in self.files:
       if file_filter and not file_filter(file):