Don't wait until boot timeout if there is no wallpaper.

When launching only core apps, the wallpaper service
is not started.  Without this change the WM waits
up to 30 seconds for the wallpaper window to be created even
though it will never happen.  This introduces a significant
delay before the boot animation is dismissed so the user can
enter a decryption password.

Bug: 6263070
Change-Id: Ia975127a0bf09cf99818f7cc4fd6c0264b740ec6

services/java/com/android/server/SystemServer.java

@@ -229,7 +229,7 @@ class ServerThread extends Thread {
             Slog.i(TAG, "Window Manager");
             wm = WindowManagerService.main(context, power,
                     factoryTest != SystemServer.FACTORY_TEST_LOW_LEVEL,
-                    !firstBoot);
+                    !firstBoot, onlyCore);
             ServiceManager.addService(Context.WINDOW_SERVICE, wm);
             inputManager = wm.getInputManagerService();
             ServiceManager.addService(Context.INPUT_SERVICE, inputManager);

services/java/com/android/server/wm/WindowManagerService.java

@@ -758,9 +758,15 @@ public class WindowManagerService extends IWindowManager.Stub
     // The desired scaling factor for compatible apps.
     float mCompatibleScreenScale;
 
+    // If true, only the core apps and services are being launched because the device
+    // is in a special boot mode, such as being encrypted or waiting for a decryption password.
+    // For example, when this flag is true, there will be no wallpaper service.
+    final boolean mOnlyCore;
+
     public static WindowManagerService main(Context context,
-            PowerManagerService pm, boolean haveInputMethods, boolean allowBootMsgs) {
-        WMThread thr = new WMThread(context, pm, haveInputMethods, allowBootMsgs);
+            PowerManagerService pm, boolean haveInputMethods, boolean allowBootMsgs,
+            boolean onlyCore) {
+        WMThread thr = new WMThread(context, pm, haveInputMethods, allowBootMsgs, onlyCore);
         thr.start();
 
         synchronized (thr) {
@@ -781,21 +787,23 @@ public class WindowManagerService extends IWindowManager.Stub
         private final PowerManagerService mPM;
         private final boolean mHaveInputMethods;
         private final boolean mAllowBootMessages;
+        private final boolean mOnlyCore;
 
         public WMThread(Context context, PowerManagerService pm,
-                boolean haveInputMethods, boolean allowBootMsgs) {
+                boolean haveInputMethods, boolean allowBootMsgs, boolean onlyCore) {
             super("WindowManager");
             mContext = context;
             mPM = pm;
             mHaveInputMethods = haveInputMethods;
             mAllowBootMessages = allowBootMsgs;
+            mOnlyCore = onlyCore;
         }
 
         @Override
         public void run() {
             Looper.prepare();
             WindowManagerService s = new WindowManagerService(mContext, mPM,
-                    mHaveInputMethods, mAllowBootMessages);
+                    mHaveInputMethods, mAllowBootMessages, mOnlyCore);
             android.os.Process.setThreadPriority(
                     android.os.Process.THREAD_PRIORITY_DISPLAY);
             android.os.Process.setCanSelfBackground(false);
@@ -858,10 +866,11 @@ public class WindowManagerService extends IWindowManager.Stub
     }
 
     private WindowManagerService(Context context, PowerManagerService pm,
-            boolean haveInputMethods, boolean showBootMsgs) {
+            boolean haveInputMethods, boolean showBootMsgs, boolean onlyCore) {
         mContext = context;
         mHaveInputMethods = haveInputMethods;
         mAllowBootMessages = showBootMsgs;
+        mOnlyCore = onlyCore;
         mLimitedAlphaCompositing = context.getResources().getBoolean(
                 com.android.internal.R.bool.config_sf_limitedAlpha);
         mHeadless = "1".equals(SystemProperties.get(SYSTEM_HEADLESS, "0"));
@@ -5191,7 +5200,8 @@ public class WindowManagerService extends IWindowManager.Stub
                 Slog.i(TAG, "performEnableScreen: mDisplayEnabled=" + mDisplayEnabled
                         + " mForceDisplayEnabled=" + mForceDisplayEnabled
                         + " mShowingBootMessages=" + mShowingBootMessages
-                        + " mSystemBooted=" + mSystemBooted, here);
+                        + " mSystemBooted=" + mSystemBooted
+                        + " mOnlyCore=" + mOnlyCore, here);
             }
             if (mDisplayEnabled) {
                 return;
@@ -5209,7 +5219,8 @@ public class WindowManagerService extends IWindowManager.Stub
                 // wallpaper, don't bother waiting for it
                 boolean haveWallpaper = false;
                 boolean wallpaperEnabled = mContext.getResources().getBoolean(
-                        com.android.internal.R.bool.config_enableWallpaperService);
+                        com.android.internal.R.bool.config_enableWallpaperService)
+                        && !mOnlyCore;
                 boolean haveKeyguard = true;
                 final int N = mWindows.size();
                 for (int i=0; i<N; i++) {