Port the current code to new IncFS

Bug: 146080380
Test: manual, "cmd incremental install-start"

Change-Id: I6761c3f0e58b6d4de1ae3c4b31c23204fba9f740
Merged-In: I6761c3f0e58b6d4de1ae3c4b31c23204fba9f740

core/java/android/os/incremental/IncrementalFileSystemControlParcel.aidl

@@ -17,11 +17,12 @@
 package android.os.incremental;
 
 /**
- * Wraps two file descriptors that Incremental Service uses to communicate
+ * Wraps the file descriptors Incremental Service uses to communicate
  * with Incremental FileSystem.
  * @hide
  */
 parcelable IncrementalFileSystemControlParcel {
     @nullable ParcelFileDescriptor cmd;
+    @nullable ParcelFileDescriptor pendingReads;
     @nullable ParcelFileDescriptor log;
 }