Create a bar char preference widget

- Per Q design, we will show a bar chart in Settings > Privacy page.
  Permission team also needs this bar chart in their page.
- Create a new library named SettingsLibBarChartPreference

Test: visual, robotest
Change-Id: Iff5a1233357a6aa6a667c0059f542a1b444b59a2
Fixes: 117623686
diff --git a/packages/SettingsLib/BarChartPreference/Android.bp b/packages/SettingsLib/BarChartPreference/Android.bp
new file mode 100644
index 0000000..477e897
--- /dev/null
+++ b/packages/SettingsLib/BarChartPreference/Android.bp
@@ -0,0 +1,13 @@
+android_library {
+    name: "SettingsLibBarChartPreference",
+
+    srcs: ["src/**/*.java"],
+    resource_dirs: ["res"],
+
+    static_libs: [
+          "androidx.preference_preference",
+    ],
+
+    sdk_version: "system_current",
+    min_sdk_version: "21",
+}