Add display_unittests to chrome_tests.py

tools/valgrind/chrome_tests.py

Index: tools/valgrind/chrome_tests.py
diff --git a/tools/valgrind/chrome_tests.py b/tools/valgrind/chrome_tests.py
index 84e4573fb8ee3e1e45527ab73408264352f6de79..c619dfed45aa981cfaa97aaa33c148694ff96f67 100755
--- a/tools/valgrind/chrome_tests.py
+++ b/tools/valgrind/chrome_tests.py
@@ -418,6 +418,9 @@ class ChromeTests:
     return self.SimpleTest("mojo_view_manager_lib",
                            "mojo_view_manager_lib_unittests")
 
+  def TestDisplay(self):
+    return self.SimpleTest("display", "display_unittests")
+
   # Valgrind timeouts are in seconds.
   UI_VALGRIND_ARGS = ["--timeout=14400", "--trace_children", "--indirect"]
   # UI test timeouts are in milliseconds.
@@ -661,6 +664,7 @@ class ChromeTests:
     "mojo_service_manager": TestMojoServiceManager,
     "mojo_view_manager": TestMojoViewManager,
     "mojo_view_manager_lib": TestMojoViewManagerLib,
+    "display": TestDisplay,
   }