Use Launcher aconfig flag in Resource file.

Use BaseIconRoot as an example. Also add bpfmt file formatting.

Bug: 393609690
Test: Verified compilation worked well and font actually built
successfully in both gradle and make.
Flag: com.android.launcher3.google_sans_flex_font

Change-Id: I2200d13a8d57e5d046a35226f08a751add937ca7

Android.bp

@@ -408,6 +408,9 @@ android_library {
     lint: {
         baseline_filename: "lint-baseline.xml",
     },
+    flags_packages: [
+        "com_android_launcher3_flags",
+    ],
 }
 
 //

PREUPLOAD.cfg

@@ -1,8 +1,10 @@
 [Builtin Hooks]
 ktfmt = true
+bpfmt = true
 
 [Builtin Hooks Options]
 ktfmt = --kotlinlang-style
+bpfmt = -d
 
 [Tool Paths]
 ktfmt = ${REPO_ROOT}/external/ktfmt/ktfmt.sh

aconfig/launcher.aconfig

@@ -565,6 +565,14 @@ flag {
   bug: "395145453"
 }
 
+flag {
+  name: "google_sans_flex_font"
+  namespace: "launcher"
+  description: "Adds refresh for font family. Needs to be fixed to be used in resources."
+  bug: "395145453"
+  is_fixed_read_only: true
+}
+
 flag {
   name: "restore_archived_shortcuts"
   namespace: "launcher"