[DO NOT MERGE] Prevent crash from early Toast surface destruction.

To understand this change it's first helpful to review Toasts.
The ViewRoot is constructed on the client side, but it's added,
to a window token controlled by the NotificationManagerService.
When we call NotificationManagerService#cancelToast, the system
will remove this window token. With the window token removed,
the WindowManager needs to destroy the surface to prevent orphaned
windows. If we destroy the Surface before removing the toast on the
client side however, we've never asked the ViewRoot to stop rendering
and we could have a crash. To solve this we just have to ensure we call
removeView before cancelToast.

Bug: 31547288
Bug: 30150688
Change-Id: I96672b0ac07ff18e9f51348f2ed42913c5a5226f

core/java/android/widget/Toast.java

@@ -100,13 +100,13 @@ public class Toast {
      */
     public Toast(Context context) {
         mContext = context;
-        mTN = new TN();
+        mTN = new TN(context.getPackageName());
         mTN.mY = context.getResources().getDimensionPixelSize(
                 com.android.internal.R.dimen.toast_y_offset);
         mTN.mGravity = context.getResources().getInteger(
                 com.android.internal.R.integer.config_toastDefaultGravity);
     }
-    
+
     /**
      * Show the view for the specified duration.
      */
@@ -133,15 +133,9 @@ public class Toast {
      * after the appropriate duration.
      */
     public void cancel() {
-        mTN.hide();
-
-        try {
-            getService().cancelToast(mContext.getPackageName(), mTN);
-        } catch (RemoteException e) {
-            // Empty
-        }
+        mTN.cancel();
     }
-    
+
     /**
      * Set the view to show.
      * @see #getView
@@ -331,18 +325,40 @@ public class Toast {
         final Runnable mHide = new Runnable() {
             @Override
             public void run() {
-                handleHide();
-                // Don't do this in handleHide() because it is also invoked by handleShow()
-                mNextView = null;
             }
         };
 
         private final WindowManager.LayoutParams mParams = new WindowManager.LayoutParams();
+
+        private static final int SHOW = 0;
+        private static final int HIDE = 1;
+        private static final int CANCEL = 2;
         final Handler mHandler = new Handler() {
             @Override
             public void handleMessage(Message msg) {
-                IBinder token = (IBinder) msg.obj;
-                handleShow(token);
+                switch (msg.what) {
+                    case SHOW: {
+                        IBinder token = (IBinder) msg.obj;
+                        handleShow(token);
+                        break;
+                    }
+                    case HIDE: {
+                        handleHide();
+                        // Don't do this in handleHide() because it is also invoked by handleShow()
+                        mNextView = null;
+                        break;
+                    }
+                    case CANCEL: {
+                        handleHide();
+                        // Don't do this in handleHide() because it is also invoked by handleShow()
+                        mNextView = null;
+                        try {
+                            getService().cancelToast(mPackageName, TN.this);
+                        } catch (RemoteException e) {
+                        }
+                        break;
+                    }
+                }
             }
         };
 
@@ -358,10 +374,12 @@ public class Toast {
 
         WindowManager mWM;
 
+        String mPackageName;
+
         static final long SHORT_DURATION_TIMEOUT = 5000;
         static final long LONG_DURATION_TIMEOUT = 1000;
 
-        TN() {
+        TN(String packageName) {
             // XXX This should be changed to use a Dialog, with a Theme.Toast
             // defined that sets up the layout params appropriately.
             final WindowManager.LayoutParams params = mParams;
@@ -374,6 +392,8 @@ public class Toast {
             params.flags = WindowManager.LayoutParams.FLAG_KEEP_SCREEN_ON
                     | WindowManager.LayoutParams.FLAG_NOT_FOCUSABLE
                     | WindowManager.LayoutParams.FLAG_NOT_TOUCHABLE;
+
+            mPackageName = packageName;
         }
 
         /**
@@ -382,7 +402,7 @@ public class Toast {
         @Override
         public void show(IBinder windowToken) {
             if (localLOGV) Log.v(TAG, "SHOW: " + this);
-            mHandler.obtainMessage(0, windowToken).sendToTarget();
+            mHandler.obtainMessage(SHOW, windowToken).sendToTarget();
         }
 
         /**
@@ -391,7 +411,12 @@ public class Toast {
         @Override
         public void hide() {
             if (localLOGV) Log.v(TAG, "HIDE: " + this);
-            mHandler.post(mHide);
+            mHandler.obtainMessage(HIDE).sendToTarget();
+        }
+
+        public void cancel() {
+            if (localLOGV) Log.v(TAG, "CANCEL: " + this);
+            mHandler.obtainMessage(CANCEL).sendToTarget();
         }
 
         public void handleShow(IBinder windowToken) {