Create FrameToken typemaps.

This makes FrameTokens consistent with WorkerTokens. A further CL will
migrate usage of base::UnguessableToken to FrameToken.

BUG=1096617

Change-Id: If29b4e50b17b4ead953b378339df214afd619ddd
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2314276
Commit-Queue: Chris Hamilton <chrisha@chromium.org>
Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Cr-Commit-Position: refs/heads/master@{#792301}

third_party/blink/public/common/BUILD.gn

@@ -168,6 +168,8 @@ source_set("headers") {
     "sms/sms_receiver_destroyed_reason.h",
     "sms/sms_receiver_outcome.h",
     "switches.h",
+    "tokens/frame_token.h",
+    "tokens/frame_token_mojom_traits.h",
     "tokens/token_mojom_traits_helper.h",
     "tokens/worker_tokens.h",
     "tokens/worker_tokens_mojom_traits.h",

third_party/blink/public/common/tokens/frame_token.h

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef THIRD_PARTY_BLINK_PUBLIC_COMMON_TOKENS_FRAME_TOKEN_H_
+#define THIRD_PARTY_BLINK_PUBLIC_COMMON_TOKENS_FRAME_TOKEN_H_
+
+#include "base/util/type_safety/token_type.h"
+
+namespace blink {
+
+// Frame token type. Note that this token is type-mapped to its mojom equivalent
+// (defined in third_party/blink/public/mojom/tokens/frame_token.mojom). See
+// frame_token_mojom_traits.h for the StructTraits.
+using FrameToken = util::TokenType<class FrameTokenTypeMarker>;
+
+}  // namespace blink
+
+#endif  // THIRD_PARTY_BLINK_PUBLIC_COMMON_TOKENS_FRAME_TOKEN_H_

third_party/blink/public/common/tokens/frame_token_mojom_traits.h

+// Copyright 2020 The Chromium Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+#ifndef THIRD_PARTY_BLINK_PUBLIC_COMMON_TOKENS_FRAME_TOKEN_MOJOM_TRAITS_H_
+#define THIRD_PARTY_BLINK_PUBLIC_COMMON_TOKENS_FRAME_TOKEN_MOJOM_TRAITS_H_
+
+#include "third_party/blink/public/common/tokens/frame_token.h"
+#include "third_party/blink/public/common/tokens/token_mojom_traits_helper.h"
+#include "third_party/blink/public/mojom/tokens/frame_token.mojom-shared.h"
+
+namespace mojo {
+
+template <>
+struct StructTraits<blink::mojom::FrameTokenDataView, blink::FrameToken>
+    : public blink::TokenMojomTraitsHelper<blink::mojom::FrameTokenDataView,
+                                           blink::FrameToken> {};
+
+}  // namespace mojo
+
+#endif  // THIRD_PARTY_BLINK_PUBLIC_COMMON_TOKENS_FRAME_TOKEN_MOJOM_TRAITS_H_

third_party/blink/public/mojom/tokens/BUILD.gn

@@ -34,6 +34,17 @@ mojom_component("tokens") {
         "//third_party/blink/public/common/tokens/worker_tokens_mojom_traits.h",
       ]
     },
+    {
+      types = [
+        {
+          mojom = "blink.mojom.FrameToken"
+          cpp = "::blink::FrameToken"
+        },
+      ]
+      traits_headers = [
+        "//third_party/blink/public/common/tokens/frame_token_mojom_traits.h",
+      ]
+    },
   ]
 
   cpp_typemaps = shared_cpp_typemaps