Switch to 8 core machine for large test suite on android-nougat-x86-rel.

Switch to 8 core machine and increase shards to match other builders for chrome_public_test_apk, content_browsertests, content_shell_test_apk, weblayer_instrumentation_test_apk

Bug: 1292221
Change-Id: I5f33f008f7824bcb40d11f85055896a68340ebf2
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3915364
Reviewed-by: Benjamin Joyce (Ben) <[email protected]>
Commit-Queue: James Shen <[email protected]>
Reviewed-by: Haiyang Pan <[email protected]>
Cr-Commit-Position: refs/heads/main@{#1050491}
diff --git a/testing/buildbot/test_suite_exceptions.pyl b/testing/buildbot/test_suite_exceptions.pyl
index be82ace..0324f149 100644
--- a/testing/buildbot/test_suite_exceptions.pyl
+++ b/testing/buildbot/test_suite_exceptions.pyl
@@ -1359,6 +1359,14 @@
         'args': [
           '--test-launcher-filter-file=../../testing/buildbot/filters/android.emulator_n.chrome_public_test_apk.filter',
         ],
+        'swarming': {
+          'shards': 25,
+          'dimension_sets': [
+            {
+              'machine_type': 'e2-standard-8', # use 8-core to shorten runtime
+            },
+          ],
+        },
       },
       'android-pie-arm64-rel': {
         'args': [
@@ -1787,7 +1795,12 @@
           '--test-launcher-filter-file=../../testing/buildbot/filters/android.emulator_n.content_browsertests.filter',
         ],
         'swarming': {
-          'shards': 20,
+          'shards': 25,
+          'dimension_sets': [
+            {
+              'machine_type': 'e2-standard-8', # use 8-core to shorten runtime
+            },
+          ],
         },
       },
       'android-pie-arm64-rel': {
@@ -1904,6 +1917,13 @@
         'args': [
           '--test-launcher-filter-file=../../testing/buildbot/filters/android.emulator_n.content_shell_test_apk.filter',
         ],
+        'swarming': {
+          'dimension_sets': [
+            {
+              'machine_type': 'e2-standard-8', # use 8-core to shorten runtime
+            },
+          ],
+        },
       },
       'android-pie-x86-rel': {
         'args': [
@@ -4062,6 +4082,15 @@
           'quickrun_shards': 2,
         },
       },
+      'android-nougat-x86-rel': {
+        'swarming': {
+          'dimension_sets': [
+            {
+              'machine_type': 'e2-standard-8', # use 8-core to shorten runtime
+            },
+          ],
+        },
+      },
     },
   },
   'weblayer_private_instrumentation_test_apk': {