Hide the boot progress

... so that it doesn't bother accessibility

Bug: 376198779
Test: follow the instruction in the bug
Change-Id: I4817617f715830a400d3daa087f3788c62de4f08
diff --git a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
index b1ebb9e..245d2b9 100644
--- a/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
+++ b/android/TerminalApp/java/com/android/virtualization/terminal/MainActivity.java
@@ -21,9 +21,9 @@
 import android.app.PendingIntent;
 import android.content.Context;
 import android.content.Intent;
+import android.content.SharedPreferences;
 import android.content.res.Configuration;
 import android.graphics.Bitmap;
-import android.content.SharedPreferences;
 import android.graphics.drawable.Icon;
 import android.graphics.fonts.FontStyle;
 import android.net.http.SslError;
@@ -208,6 +208,8 @@
                                     public void onComplete(long requestId) {
                                         if (requestId == mRequestId) {
                                             android.os.Trace.endAsyncSection("executeTerminal", 0);
+                                            findViewById(R.id.boot_progress)
+                                                    .setVisibility(View.GONE);
                                             view.setVisibility(View.VISIBLE);
                                         }
                                     }
diff --git a/android/TerminalApp/res/layout/activity_headless.xml b/android/TerminalApp/res/layout/activity_headless.xml
index 7baaf5c..7da87af 100644
--- a/android/TerminalApp/res/layout/activity_headless.xml
+++ b/android/TerminalApp/res/layout/activity_headless.xml
@@ -16,6 +16,7 @@
         android:layout_width="match_parent"
         android:layout_height="match_parent">
         <LinearLayout
+            android:id="@+id/boot_progress"
             android:orientation="vertical"
             android:gravity="center"
             android:layout_gravity="center"