CacheStorage: Add testing configs for sequence and parallel ops trials.

This CL also flips the respective virtual test suites to disable their
features to maintain test coverage of the non-trial configurations.

Bug: 985379
Change-Id: I57b2eb98e9d932b0b714804c58b89560bcf7afad
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1736928Reviewed-by: Steven Holte <holte@chromium.org>
Commit-Queue: Ben Kelly <wanderview@chromium.org>
Cr-Commit-Position: refs/heads/master@{#685556}

testing/variations/fieldtrial_testing_config.json

@@ -1369,6 +1369,47 @@
             ]
         }
     ],
+    "CacheStorageParallelOps": [
+        {
+            "platforms": [
+                "windows",
+                "mac",
+                "chromeos",
+                "linux",
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled16_v1",
+                    "params": {
+                        "max_shares_ops": "16"
+                    },
+                    "enable_features": [
+                        "CacheStorageParallelOps"
+                    ]
+                }
+            ]
+        }
+    ],
+    "CacheStorageSequence": [
+        {
+            "platforms": [
+                "windows",
+                "mac",
+                "chromeos",
+                "linux",
+                "android"
+            ],
+            "experiments": [
+                {
+                    "name": "Enabled1",
+                    "enable_features": [
+                        "CacheStorageSequence"
+                    ]
+                }
+            ]
+        }
+    ],
     "CertDualVerificationTrial": [
         {
             "platforms": [

third_party/blink/web_tests/VirtualTestSuites

@@ -1128,14 +1128,12 @@
   {
     "prefix": "cache-storage-parallel",
     "base": "external/wpt/service-workers",
-    "args": ["--enable-features=CacheStorageParallelOps<CSPO",
-             "--force-fieldtrials=CSPO/G1",
-             "--force-fieldtrial-params=CSPO.G1:max_shared_ops/64"]
+    "args": ["--disable-features=CacheStorageParallelOps"]
   },
   {
     "prefix": "cache-storage-sequence",
     "base": "external/wpt/service-workers",
-    "args": ["--enable-features=CacheStorageSequence"]
+    "args": ["--disable-features=CacheStorageSequence"]
   },
   {
     "prefix": "conditional-appcache-delay",

third_party/blink/web_tests/virtual/cache-storage-parallel/external/wpt/service-workers/README.txt

 This suite runs the ServiceWorker and CacheStorage tests with the
-CacheStorageParallelOps feature enabled and set to 64 maximum shared
-operations.  This makes cache_storage execute read operations in
-parallel.
+CacheStorageParallelOps feature disabled.  This makes cache_storage
+execute read operations in sequence.

third_party/blink/web_tests/virtual/cache-storage-sequence/external/wpt/service-workers/README.txt

 This suite runs the ServiceWorker and CacheStorage tests with the
-CacheStorageSequence feature enabled.  This makes CacheStorage operate off
+CacheStorageSequence feature disabled.  This makes CacheStorage operate on
 the IO thread in the browser process.