Cherry pick Introduce startIsolatedProcess private API in ActivityManager DO NOT MERGE

The new API spawns a isolated process, using a custom uid, entrypoint and
abi. Such API is used by the WebViewFactory to spawn its unpriviledged
but trusted process (hence the fixed uid) which rewrites the rerlo file
on boot / when an update occurs.
Since both the ActivityManager service and the WebViewUpdate service
live in the SystemServer their calls be dispatched locally and no
binder interface needs to be exposed for the new startIsolatedProcess API.

Original BUG:16403706
Original Change-Id: I327b59735c12698595e0dbcc4da5d759c9103b0a

Bug: 16723226
Change-Id: Iecb49888e11eec9d302d9712953fd498db5821af
diff --git a/core/java/android/app/IActivityManager.java b/core/java/android/app/IActivityManager.java
index 5347f03..772e132 100644
--- a/core/java/android/app/IActivityManager.java
+++ b/core/java/android/app/IActivityManager.java
@@ -454,7 +454,7 @@
      * Private non-Binder interfaces
      */
     /* package */ boolean testIsSystemReady();
-    
+
     /** Information you can retrieve about a particular application. */
     public static class ContentProviderHolder implements Parcelable {
         public final ProviderInfo info;