weblayer: Add skew tests for new versions released in beta

Skew tests are being added for the following versions:
1, 88.0.4324.29
2, 86.0.4240.99
3, 87.0.4280.86

R=rmhasan@google.com

Bug: 1041619
Change-Id: Iaee1425137735a9ed834a4e78fc26dba0ce5a64d
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2573067
Commit-Queue: chrome-weblayer-builder <chrome-weblayer-builder@chops-service-accounts.iam.gserviceaccount.com>
Commit-Queue: Rakib Hasan <rmhasan@google.com>
Reviewed-by: Rakib Hasan <rmhasan@google.com>
Cr-Commit-Position: refs/heads/master@{#833587}

testing/buildbot/variants.pyl

@@ -337,18 +337,18 @@
       '--client-outdir',
       '.',
       '--implementation-outdir',
-      '../../weblayer_instrumentation_test_M87/out/Release',
+      '../../weblayer_instrumentation_test_M88/out/Release',
       '--test-expectations',
       '../../weblayer/browser/android/javatests/skew/expectations.txt',
-      '--impl-version=87',
+      '--impl-version=88',
     ],
-    'identifier': 'M87_Implementation_Library_Tests',
+    'identifier': 'M88_Implementation_Library_Tests',
     'swarming': {
       'cipd_packages': [
         {
           'cipd_package': 'chromium/testing/weblayer-x86',
-          'location': 'weblayer_instrumentation_test_M87',
-          'revision': 'version:87.0.4280.86',
+          'location': 'weblayer_instrumentation_test_M88',
+          'revision': 'version:88.0.4324.29',
         }
       ],
     },
@@ -360,18 +360,18 @@
       '--client-outdir',
       '.',
       '--implementation-outdir',
-      '../../weblayer_instrumentation_test_M86/out/Release',
+      '../../weblayer_instrumentation_test_M87/out/Release',
       '--test-expectations',
       '../../weblayer/browser/android/javatests/skew/expectations.txt',
-      '--impl-version=86',
+      '--impl-version=87',
     ],
-    'identifier': 'M86_Implementation_Library_Tests',
+    'identifier': 'M87_Implementation_Library_Tests',
     'swarming': {
       'cipd_packages': [
         {
           'cipd_package': 'chromium/testing/weblayer-x86',
-          'location': 'weblayer_instrumentation_test_M86',
-          'revision': 'version:86.0.4240.99',
+          'location': 'weblayer_instrumentation_test_M87',
+          'revision': 'version:87.0.4280.86',
         }
       ],
     },
@@ -383,18 +383,18 @@
       '--client-outdir',
       '.',
       '--implementation-outdir',
-      '../../weblayer_instrumentation_test_M85/out/Release',
+      '../../weblayer_instrumentation_test_M86/out/Release',
       '--test-expectations',
       '../../weblayer/browser/android/javatests/skew/expectations.txt',
-      '--impl-version=85',
+      '--impl-version=86',
     ],
-    'identifier': 'M85_Implementation_Library_Tests',
+    'identifier': 'M86_Implementation_Library_Tests',
     'swarming': {
       'cipd_packages': [
         {
           'cipd_package': 'chromium/testing/weblayer-x86',
-          'location': 'weblayer_instrumentation_test_M85',
-          'revision': 'version:85.0.4183.140',
+          'location': 'weblayer_instrumentation_test_M86',
+          'revision': 'version:86.0.4240.99',
         }
       ],
     },
@@ -427,20 +427,20 @@
       '--test-runner-outdir',
       '.',
       '--client-outdir',
-      '../../weblayer_instrumentation_test_M87/out/Release',
+      '../../weblayer_instrumentation_test_M88/out/Release',
       '--implementation-outdir',
       '.',
       '--test-expectations',
       '../../weblayer/browser/android/javatests/skew/expectations.txt',
-      '--client-version=87',
+      '--client-version=88',
     ],
-    'identifier': 'M87_Client_Library_Tests',
+    'identifier': 'M88_Client_Library_Tests',
     'swarming': {
       'cipd_packages': [
         {
           'cipd_package': 'chromium/testing/weblayer-x86',
-          'location': 'weblayer_instrumentation_test_M87',
-          'revision': 'version:87.0.4280.86',
+          'location': 'weblayer_instrumentation_test_M88',
+          'revision': 'version:88.0.4324.29',
         }
       ],
     },
@@ -450,20 +450,20 @@
       '--test-runner-outdir',
       '.',
       '--client-outdir',
-      '../../weblayer_instrumentation_test_M86/out/Release',
+      '../../weblayer_instrumentation_test_M87/out/Release',
       '--implementation-outdir',
       '.',
       '--test-expectations',
       '../../weblayer/browser/android/javatests/skew/expectations.txt',
-      '--client-version=86',
+      '--client-version=87',
     ],
-    'identifier': 'M86_Client_Library_Tests',
+    'identifier': 'M87_Client_Library_Tests',
     'swarming': {
       'cipd_packages': [
         {
           'cipd_package': 'chromium/testing/weblayer-x86',
-          'location': 'weblayer_instrumentation_test_M86',
-          'revision': 'version:86.0.4240.99',
+          'location': 'weblayer_instrumentation_test_M87',
+          'revision': 'version:87.0.4280.86',
         }
       ],
     },
@@ -473,20 +473,20 @@
       '--test-runner-outdir',
       '.',
       '--client-outdir',
-      '../../weblayer_instrumentation_test_M85/out/Release',
+      '../../weblayer_instrumentation_test_M86/out/Release',
       '--implementation-outdir',
       '.',
       '--test-expectations',
       '../../weblayer/browser/android/javatests/skew/expectations.txt',
-      '--client-version=85',
+      '--client-version=86',
     ],
-    'identifier': 'M85_Client_Library_Tests',
+    'identifier': 'M86_Client_Library_Tests',
     'swarming': {
       'cipd_packages': [
         {
           'cipd_package': 'chromium/testing/weblayer-x86',
-          'location': 'weblayer_instrumentation_test_M85',
-          'revision': 'version:85.0.4183.140',
+          'location': 'weblayer_instrumentation_test_M86',
+          'revision': 'version:86.0.4240.99',
         }
       ],
     },