Switch IProcessObserver to report process state

When IProcessObserver was created, the only information
we had for the state of a process was its "importance".
Now we have the process state, which is much more useful.
Switch to reporting that.

Change-Id: Icdb3eea8cf96f4eff7ed3d584f940a1bd9cc3884

core/java/android/app/ActivityManager.java

@@ -1626,13 +1626,6 @@ public class ActivityManager {
          */
         public int lastTrimLevel;
 
-        /**
-         * Constant for {@link #importance}: this is a persistent process.
-         * Only used when reporting to process observers.
-         * @hide
-         */
-        public static final int IMPORTANCE_PERSISTENT = 50;
-
         /**
          * Constant for {@link #importance}: this process is running the
          * foreground UI.
@@ -1748,9 +1741,16 @@ public class ActivityManager {
          */
         public int importanceReasonImportance;
 
+        /**
+         * Current process state, as per PROCESS_STATE_* constants.
+         * @hide
+         */
+        public int processState;
+
         public RunningAppProcessInfo() {
             importance = IMPORTANCE_FOREGROUND;
             importanceReasonCode = REASON_UNKNOWN;
+            processState = PROCESS_STATE_IMPORTANT_FOREGROUND;
         }
         
         public RunningAppProcessInfo(String pProcessName, int pPid, String pArr[]) {
@@ -1776,6 +1776,7 @@ public class ActivityManager {
             dest.writeInt(importanceReasonPid);
             ComponentName.writeToParcel(importanceReasonComponent, dest);
             dest.writeInt(importanceReasonImportance);
+            dest.writeInt(processState);
         }
 
         public void readFromParcel(Parcel source) {
@@ -1791,6 +1792,7 @@ public class ActivityManager {
             importanceReasonPid = source.readInt();
             importanceReasonComponent = ComponentName.readFromParcel(source);
             importanceReasonImportance = source.readInt();
+            processState = source.readInt();
         }
 
         public static final Creator<RunningAppProcessInfo> CREATOR = 

core/java/android/app/IProcessObserver.aidl

@@ -20,7 +20,7 @@ package android.app;
 oneway interface IProcessObserver {
 
     void onForegroundActivitiesChanged(int pid, int uid, boolean foregroundActivities);
-    void onImportanceChanged(int pid, int uid, int importance);
+    void onProcessStateChanged(int pid, int uid, int procState);
     void onProcessDied(int pid, int uid);
 
 }