webcrypto: Add ECDSA algorithm (chromium-side)

content/child/webcrypto/status.h

Index: content/child/webcrypto/status.h
diff --git a/content/child/webcrypto/status.h b/content/child/webcrypto/status.h
index 4c1aae6e1857a1d047839c2e1516d52c9d24cfbd..5c7b99677eb4c02cc77538fbb3688912bb979e22 100644
--- a/content/child/webcrypto/status.h
+++ b/content/child/webcrypto/status.h
@@ -213,6 +213,17 @@ class CONTENT_EXPORT Status {
   // and algorithm.
   static Status ErrorCreateKeyBadUsages();
 
+  // An EC key imported using SPKI/PKCS8 format had the wrong curve specified in
+  // the key.
+  static Status ErrorImportedEcKeyIncorrectCurve();
+
+  // The "crv" member for a JWK did not match the expectations from importKey()
+  static Status ErrorJwkIncorrectCrv();
+
+  // The EC key failed validation (coordinates don't lie on curve, out of range,
+  // etc.)
+  static Status ErrorEcKeyInvalid();
+
  private:
   enum Type { TYPE_ERROR, TYPE_SUCCESS };