Don't deliver broadcast to apps that are being backed up

When doing a full backup, mark the process as being in
backup and don't deliver any broadcasts to an app in
that state.

Bug: 25350780
Change-Id: I1adc95431f709495d3c1141c7c5d3616cf9cc1f0
diff --git a/services/core/java/com/android/server/am/ProcessRecord.java b/services/core/java/com/android/server/am/ProcessRecord.java
index 059acbd..da18f32 100644
--- a/services/core/java/com/android/server/am/ProcessRecord.java
+++ b/services/core/java/com/android/server/am/ProcessRecord.java
@@ -192,6 +192,9 @@
     // app that installed the package.
     ComponentName errorReportReceiver;
 
+    // Process is currently hosting a backup agent for backup or restore
+    public boolean inFullBackup;
+
     void dump(PrintWriter pw, String prefix) {
         final long now = SystemClock.uptimeMillis();