cros_generate_breakpad_symbols: add --sysroot support

We don't use it directly, but makes for easier testing and local uploads.

BUG=None
TEST=precq passes

Change-Id: I0779b350ae794890fc8da69dcbed0795744f42c9
Reviewed-on: https://chromium-review.googlesource.com/1091960
Commit-Ready: Mike Frysinger <vapier@chromium.org>
Tested-by: Mike Frysinger <vapier@chromium.org>
Reviewed-by: Benjamin Gordon <bmgordon@chromium.org>
diff --git a/scripts/cros_generate_breakpad_symbols_unittest.py b/scripts/cros_generate_breakpad_symbols_unittest.py
index 9692ee9..4db76d0 100644
--- a/scripts/cros_generate_breakpad_symbols_unittest.py
+++ b/scripts/cros_generate_breakpad_symbols_unittest.py
@@ -31,7 +31,8 @@
     self.path = path
     super(FindDebugDirMock, self).__init__(*args, **kwargs)
 
-  def FindDebugDir(self, _board):
+  # pylint: disable=unused-argument
+  def FindDebugDir(self, _board, sysroot=None):
     return self.path