[Re-land] Add network throttling as enterprise policy

chrome/test/data/policy/policy_test_cases.json

Index: chrome/test/data/policy/policy_test_cases.json
diff --git a/chrome/test/data/policy/policy_test_cases.json b/chrome/test/data/policy/policy_test_cases.json
index ca809119160a3061e15e9401299dab5ee4876aaf..598667b2613c677690d34bd2bd4d7a7907ffe581 100644
--- a/chrome/test/data/policy/policy_test_cases.json
+++ b/chrome/test/data/policy/policy_test_cases.json
@@ -2950,6 +2950,16 @@
     ]
   },
 
+  "NetworkThrottlingEnabled": {
+    "os": ["chromeos"],
+    "test_policy": { "NetworkThrottlingEnabled": {"enabled": "true", "upload_rate_kbits": "5600", "download_rate_kbits": "5600"} },
+    "pref_mappings": [
+      { "pref": "net.throttling_enabled",
+        "local_state": true
+      }
+    ]
+  },
+
   "LoginVideoCaptureAllowedUrls": {
     "os": ["chromeos"],
     "test_policy": { "LoginVideoCaptureAllowedUrls": [ "https://example.com" ] },