To support loading display_settings.xml on treblized builds, include

the product directory on the search path for the file. If not found,
fallback to the vendor directory.

Bug: 198411988
Test: Manual

Change-Id: I542d68fa9fcb8ebf19c3c193377e11257e1f4e9a

services/core/java/com/android/server/wm/DisplayWindowSettingsProvider.java

@@ -264,8 +264,14 @@ class DisplayWindowSettingsProvider implements SettingsProvider {
 
     @NonNull
     private static AtomicFile getVendorSettingsFile() {
-        final File vendorFile = new File(Environment.getVendorDirectory(),
+        // First look under product path for treblized builds.
+        File vendorFile = new File(Environment.getProductDirectory(),
                 VENDOR_DISPLAY_SETTINGS_FILE_PATH);
+        if (!vendorFile.exists()) {
+            // Try and look in vendor path.
+            vendorFile = new File(Environment.getVendorDirectory(),
+                VENDOR_DISPLAY_SETTINGS_FILE_PATH);
+        }
         return new AtomicFile(vendorFile, WM_DISPLAY_COMMIT_TAG);
     }