Add constants to adjust Vending input and output buffer sizes.

- Needed for Bug: 2058060

core/java/android/provider/Settings.java

@@ -2972,6 +2972,18 @@ public final class Settings {
         public static final String VENDING_PENDING_DOWNLOAD_RESEND_FREQUENCY_MS =
                 "vending_pd_resend_frequency_ms";
 
+        /**
+         * Size of buffer in bytes for Vending to use when reading cache files.
+         */
+        public static final String VENDING_DISK_INPUT_BUFFER_BYTES =
+                "vending_disk_input_buffer_bytes";
+
+        /**
+         * Size of buffer in bytes for Vending to use when writing cache files.
+         */
+        public static final String VENDING_DISK_OUTPUT_BUFFER_BYTES =
+                "vending_disk_output_buffer_bytes";
+
         /**
          * Frequency in milliseconds at which we should cycle through the promoted applications
          * on the home screen or the categories page.