Add PrinterSpecifics to the sync protos.

components/sync/syncable/model_type.cc

Index: components/sync/syncable/model_type.cc
diff --git a/components/sync/syncable/model_type.cc b/components/sync/syncable/model_type.cc
index 51ba9ed857837c6dd715f8323baa8cea77c2e4ff..15f7bd9fd79ccc90592a91fd9c94c224e26428b3 100644
--- a/components/sync/syncable/model_type.cc
+++ b/components/sync/syncable/model_type.cc
@@ -133,6 +133,8 @@ const ModelTypeInfo kModelTypeInfoMap[] = {
      sync_pb::EntitySpecifics::kManagedUserWhitelistFieldNumber, 33},
     {ARC_PACKAGE, "ARC_PACKAGE", "arc_package", "Arc Package",
      sync_pb::EntitySpecifics::kArcPackageFieldNumber, 36},
+    {PRINTERS, "PRINTER", "printers", "Printers",
+     sync_pb::EntitySpecifics::kPrinterFieldNumber, 37},
     {PROXY_TABS, "", "", "Tabs", -1, 25},
     {NIGORI, "NIGORI", "nigori", "Encryption keys",
      sync_pb::EntitySpecifics::kNigoriFieldNumber, 17},
@@ -154,7 +156,7 @@ const char* kUserSelectableDataTypeNames[] = {
 };
 
 static_assert(
-    37 == MODEL_TYPE_COUNT,
+    38 == MODEL_TYPE_COUNT,
     "update kUserSelectableDataTypeName to match UserSelectableTypes");
 
 void AddDefaultFieldValue(ModelType datatype,
@@ -236,6 +238,9 @@ void AddDefaultFieldValue(ModelType datatype,
     case EXPERIMENTS:
       specifics->mutable_experiments();
       break;
+    case PRINTERS:
+      specifics->mutable_printer();
+      break;
     case PRIORITY_PREFERENCES:
       specifics->mutable_priority_preference();
       break;
@@ -400,6 +405,9 @@ ModelType GetModelTypeFromSpecifics(const sync_pb::EntitySpecifics& specifics) {
   if (specifics.has_priority_preference())
     return PRIORITY_PREFERENCES;
 
+  if (specifics.has_printer())
+    return PRINTERS;
+
   if (specifics.has_dictionary())
     return DICTIONARY;