[blinkpy] Extend Mac macro to cover more versions

Although we don't fully support 10.14 or 10.15 yet (we don't have
version-specific baselines for them), this should help to drastically
drive down the number of failures.

Bug: 1001606
Change-Id: I3cd93619c015cb154885a154660b169eb1bada58
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790267
Auto-Submit: Robert Ma <robertma@chromium.org>
Reviewed-by: Dirk Pranke <dpranke@chromium.org>
Commit-Queue: Robert Ma <robertma@chromium.org>
Cr-Commit-Position: refs/heads/master@{#694358}

third_party/blink/tools/blinkpy/web_tests/models/test_expectations.py

@@ -73,7 +73,7 @@ _PLATFORM_TOKENS_LIST = [
     'Fuchsia',
     'IOS', 'IOS12.2', 'IOS13.0',
     'Linux',
-    'Mac', 'Mac10.10', 'Mac10.11', 'Retina', 'Mac10.12', 'Mac10.13',
+    'Mac', 'Retina', 'Mac10.10', 'Mac10.11', 'Mac10.12', 'Mac10.13', 'Mac10.14', 'Mac10.15',
     'Win', 'Win7', 'Win10'
 ]
 

third_party/blink/tools/blinkpy/web_tests/port/base.py

@@ -129,6 +129,8 @@ class Port(object):
         ('mac10.11', 'x86'),
         ('mac10.12', 'x86'),
         ('mac10.13', 'x86'),
+        ('mac10.14', 'x86'),
+        ('mac10.15', 'x86'),
         ('win7', 'x86'),
         ('win10', 'x86'),
         ('trusty', 'x86_64'),
@@ -140,7 +142,7 @@ class Port(object):
     )
 
     CONFIGURATION_SPECIFIER_MACROS = {
-        'mac': ['retina', 'mac10.10', 'mac10.11', 'mac10.12', 'mac10.13'],
+        'mac': ['retina', 'mac10.10', 'mac10.11', 'mac10.12', 'mac10.13', 'mac10.14', 'mac10.15'],
         'win': ['win7', 'win10'],
         'linux': ['trusty'],
         'fuschia': ['fuchsia'],