Add another test for importing a bad EC key into WebCrypto.

content/test/data/webcrypto/bad_ec_keys.json

 // This file contains incorrect key data in a variety of formats.
 //   "key" -- either a dictionary for JWK, or hex encoded bytes for PKCS8/SPKI.
 //   "key_format" -- one of: "jwk", "pkcs8", "spki"
 //   "error" -- The expected rejection reason when importing the key.
 [
 // --------------------------------------------------------------------------
 // Bad public keys
 // --------------------------------------------------------------------------
 // TODO(eroman): Group the bad public keys by format type.
 
@@ skipping 191 matching lines @@
       "d": "pJLOj6kAhMIn4aMveXTTnp_2en6HBew0GbNftgdYK-vUYeCxUgrHbsLdTptj665x",
       "x": "5V_ubEnY1SP1znv5wEJc5P9lBwi33lz7CVkBUjl5p_BCYC2zCFRzU2mBO1w_Xvho",
       "y": "KPWcxdxQlJKpiNOKjiUZ3j0MT9D72wmT448YUGwXYGxeJCSSRvHOlJg6U2HFvpg-"
     },
     "error": "OperationError"
   },
 
 // --------------------------------------------------------------------------
 // Bad private keys (PKCS8)
 // --------------------------------------------------------------------------
+  
+  // The private key is exactly equal to the order, and the public key is
+  // private key * order.
+  {
+    "crv": "P-256",
+    "key_format": "pkcs8",
+    "key": "3066020100301306072A8648CE3D020106082A8648CE3D030107044C304A0201010420FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551A12303210000FFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551",
+    "error": "DataError"
+  },
 
   // The private key is exactly equal to the order, and the public key is
   // omitted.
   {
     "crv": "P-256",
     "key_format": "pkcs8",
     "key": "3041020100301306072A8648CE3D020106082A8648CE3D030107042730250201010420FFFFFFFF00000000FFFFFFFFFFFFFFFFBCE6FAADA7179E84F3B9CAC2FC632551",
     "error": "DataError: The imported EC key is invalid"
   },
 
   // The private key is exactly equal to the order + 11, and the public key is
   // private key * order.
   {
     "crv": "P-521",
     "key_format": "pkcs8",
     "key": "3081EE020100301006072A8648CE3D020106052B810400230481D63081D3020101044201FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386414A181890381860004008A75841259FDEDFF546F1A39573B4315CFED5DC7ED7C17849543EF2C54F2991652F3DBC5332663DA1BD19B1AEBE3191085015C024FA4C9A902ECC0E02DDA0CDB9A0096FB303FCBBA2129849D0CA877054FB2293ADD566210BD0493ED2E95D4E0B9B82B1BC8A90E8B42A4AB3892331914A95336DCAC80E3F4819B5D58874F92CE48C808",
     "error": "DataError: The imported EC key is invalid"
   },
 
   // The private key is exactly equal to the order + 11, and the public key is
   // omitted.
   {
     "crv": "P-521",
     "key_format": "pkcs8",
     "key": "3060020100301006072A8648CE3D020106052B8104002304493047020101044201FFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFFA51868783BF2F966B7FCC0148F709A5D03BB5C9B8899C47AEBB6FB71E91386414",
     "error": "DataError: The imported EC key is invalid"
   }
 ]