Move font tool build rules to subdir

The top-level Android.bp file is very large, so move modules that can be
in subdirs.

Also rename the vague "base_defaults" module to something more suitable.

Bug: 185128417
Test: m
Merged-In: I5f3106b74edb91ac9db5b3e66cc61566d0f16e9b
Change-Id: I5f3106b74edb91ac9db5b3e66cc61566d0f16e9b

Android.bp

@@ -658,32 +658,6 @@ cc_library {
     },
 }
 
-python_defaults {
-    name: "base_default",
-    version: {
-        py2: {
-            enabled: false,
-            embedded_launcher: false,
-        },
-        py3: {
-            enabled: true,
-            embedded_launcher: true,
-        },
-    },
-}
-
-python_binary_host {
-    name: "fontchain_linter",
-    defaults: ["base_default"],
-    main: "tools/fonts/fontchain_linter.py",
-    srcs: [
-        "tools/fonts/fontchain_linter.py",
-    ],
-    libs: [
-        "fontTools",
-    ],
-}
-
 // utility classes statically linked into framework-wifi and dynamically linked
 // into wifi-service
 java_library {

tools/fonts/Android.bp

@@ -0,0 +1,39 @@
+// Copyright (C) 2021 The Android Open Source Project
+//
+// Licensed under the Apache License, Version 2.0 (the "License");
+// you may not use this file except in compliance with the License.
+// You may obtain a copy of the License at
+//
+//      http://www.apache.org/licenses/LICENSE-2.0
+//
+// Unless required by applicable law or agreed to in writing, software
+// distributed under the License is distributed on an "AS IS" BASIS,
+// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+// See the License for the specific language governing permissions and
+// limitations under the License.
+
+python_defaults {
+    name: "fonts_python_defaults",
+    version: {
+        py2: {
+            enabled: false,
+            embedded_launcher: false,
+        },
+        py3: {
+            enabled: true,
+            embedded_launcher: true,
+        },
+    },
+}
+
+python_binary_host {
+    name: "fontchain_linter",
+    defaults: ["fonts_python_defaults"],
+    main: "fontchain_linter.py",
+    srcs: [
+        "fontchain_linter.py",
+    ],
+    libs: [
+        "fontTools",
+    ],
+}