Add force-stop subcommand for 'am'.

It's useful for some testing and debugging, to ensure all processes
are stopped before testing. 'kill' doesn't always work because sometimes the
system will restart the process immediately (e.g. if an app is running in
background).

Change-Id: I2c0caa38f74ee65ad6c35172fbf505227be7e7c3

cmds/am/src/com/android/commands/am/Am.java

diff --git a/cmds/am/src/com/android/commands/am/Am.java b/cmds/am/src/com/android/commands/am/Am.java
index 38cacdd..424b70a 100644
--- a/cmds/am/src/com/android/commands/am/Am.java
+++ b/cmds/am/src/com/android/commands/am/Am.java
@@ -98,6 +98,8 @@
             runStart();
         } else if (op.equals("startservice")) {
             runStartService();
+        } else if (op.equals("force-stop")) {
+            runForceStop();
         } else if (op.equals("instrument")) {
             runInstrument();
         } else if (op.equals("broadcast")) {
@@ -365,6 +367,10 @@
         }
     }
 
+    private void runForceStop() throws Exception {
+        mAm.forceStopPackage(nextArgRequired());
+    }
+
     private void sendBroadcast() throws Exception {
         Intent intent = makeIntent();
         IntentReceiver receiver = new IntentReceiver();
@@ -851,7 +857,7 @@
                 wm.clearForcedDisplaySize();
             }
         } catch (RemoteException e) {
-       }
+        }
     }
 
     private class IntentReceiver extends IIntentReceiver.Stub {
@@ -1013,6 +1019,8 @@
                 "\n" +
                 "    start a Service: am startservice <INTENT>\n" +
                 "\n" +
+                "    force stop everything associated with a package: force-stop <package>\n" +
+                "\n" +
                 "    send a broadcast Intent: am broadcast <INTENT>\n" +
                 "\n" +
                 "    start an Instrumentation: am instrument [flags] <COMPONENT>\n" +