Re-land: Trigger linux_layout_tests_layout_ng for LayoutNG changes

third_party/WebKit/PRESUBMIT.py

Index: third_party/WebKit/PRESUBMIT.py
diff --git a/third_party/WebKit/PRESUBMIT.py b/third_party/WebKit/PRESUBMIT.py
index 22ffdc9ca5cf095aaae88d406e4235cee4973ea4..b04e9a86d7ae1f85a0d70753e66b81ca0925b57d 100644
--- a/third_party/WebKit/PRESUBMIT.py
+++ b/third_party/WebKit/PRESUBMIT.py
@@ -294,19 +294,43 @@ def _ArePaintOrCompositingDirectoriesModified(change):  # pylint: disable=C0103
     return False
 
 
+def _AreLayoutNGDirectoriesModified(change):  # pylint: disable=C0103
+    """Checks whether CL has changes to a layout ng directory."""
+    layout_ng_paths = [
+        os.path.join('third_party', 'WebKit', 'Source', 'core', 'layout',
+                     'ng'),
+    ]
+    for affected_file in change.AffectedFiles():
+        file_path = affected_file.LocalPath()
+        if any(x in file_path for x in layout_ng_paths):
+            return True
+    return False
+
+
 def PostUploadHook(cl, change, output_api):  # pylint: disable=C0103
     """git cl upload will call this hook after the issue is created/modified.
 
     This hook adds extra try bots to the CL description in order to run slimming
-    paint v2 tests in addition to the CQ try bots if the change contains paint
-    or compositing changes (see: _ArePaintOrCompositingDirectoriesModified). For
-    more information about slimming-paint-v2 tests see https://crbug.com/601275.
+    paint v2 tests or LayoutNG tests in addition to the CQ try bots if the
+    change contains changes in a relevant direcotry (see:
+    _ArePaintOrCompositingDirectoriesModified and
+    _AreLayoutNGDirectoriesModified). For more information about
+    slimming-paint-v2 tests see https://crbug.com/601275 and for information
+    about the LayoutNG tests see https://crbug.com/706183.
     """
-    if not _ArePaintOrCompositingDirectoriesModified(change):
-        return []
-    return output_api.EnsureCQIncludeTrybotsAreAdded(
-        cl,
-        ['master.tryserver.chromium.linux:'
-         'linux_layout_tests_slimming_paint_v2'],
-        'Automatically added slimming-paint-v2 tests to run on CQ due to '
-        'changes in paint or compositing directories.')
+    results = []
+    if _ArePaintOrCompositingDirectoriesModified(change):
+        results.extend(output_api.EnsureCQIncludeTrybotsAreAdded(
+            cl,
+            ['master.tryserver.chromium.linux:'
+             'linux_layout_tests_slimming_paint_v2'],
+            'Automatically added slimming-paint-v2 tests to run on CQ due to '
+            'changes in paint or compositing directories.'))
+    if _AreLayoutNGDirectoriesModified(change):
+        results.extend(output_api.EnsureCQIncludeTrybotsAreAdded(
+            cl,
+            ['master.tryserver.chromium.linux:'
+             'linux_layout_tests_layout_ng'],
+            'Automatically added linux_layout_tests_layout_ng to run on CQ due '
+            'to changes in LayoutNG directories.'))
+    return results