Modify DeviceInfo proto for migrating Sharing data over

- Committing proto change ahead of main CL, so we can export proto change
  to Sync server earlier

Bug: 991971
Change-Id: I11807960d5f7486cc1c16def63da4956834ac326
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1806861
Commit-Queue: Alex Chau <alexchau@chromium.org>
Reviewed-by: Mikel Astiz <mastiz@chromium.org>
Cr-Commit-Position: refs/heads/master@{#697167}

components/sync/protocol/device_info_specifics.proto

@@ -56,6 +56,9 @@ message DeviceInfoSpecifics {
   // can not be derived from the other fields in the proto and are not general
   // enough to be used by another feature.
   optional FeatureSpecificFields feature_fields = 9;
+
+  // Device specific information for Sharing feature.
+  optional SharingSpecificFields sharing_fields = 10;
 }
 
 // Feature specific information about the device that is running a sync-enabled
@@ -68,3 +71,26 @@ message FeatureSpecificFields {
   // feature
   optional bool send_tab_to_self_receiving_enabled = 1;
 }
+
+// Device specific information for Sharing feature. Used to send end-to-end
+// encrypted message through FCM to other devices.
+message SharingSpecificFields {
+  // FCM registration token of device for sending SharingMessage.
+  optional string fcm_token = 1;
+
+  // Subscription public key required for message encryption [RFC8291].
+  optional bytes p256dh = 2;
+
+  // Auth secret key required for message encryption [RFC8291].
+  optional bytes auth_secret = 3;
+
+  // Enum defining available Sharing features.
+  enum EnabledFeatures {
+    UNKNOWN = 0;
+    CLICK_TO_CALL = 1;
+    SHARED_CLIPBOARD = 2;
+  }
+
+  // A list of enabled Sharing features.
+  repeated EnabledFeatures enabled_features = 4;
+}

components/sync/protocol/proto_visitors.h

@@ -340,12 +340,20 @@ VISIT_PROTO_FIELDS(const sync_pb::DeviceInfoSpecifics& proto) {
   VISIT(signin_scoped_device_id);
   VISIT(last_updated_timestamp);
   VISIT(feature_fields);
+  VISIT(sharing_fields);
 }
 
 VISIT_PROTO_FIELDS(const sync_pb::FeatureSpecificFields& proto) {
   VISIT(send_tab_to_self_receiving_enabled);
 }
 
+VISIT_PROTO_FIELDS(const sync_pb::SharingSpecificFields& proto) {
+  VISIT(fcm_token);
+  VISIT_BYTES(p256dh);
+  VISIT_BYTES(auth_secret);
+  VISIT_REP(enabled_features);
+}
+
 VISIT_PROTO_FIELDS(const sync_pb::DictionarySpecifics& proto) {
   VISIT(word);
 }