Move window moving and resizing handling to WindowManager

- add a startMoving API to initiate a window move from app, once
  the move starts WindowManager will take over the event handling.

- detect touch events along window's outside border and start
  a resize if necessary

Change-Id: Ic7e8baba34e0aa27a43173e044ffb46e93e219e0
diff --git a/services/core/java/com/android/server/wm/Session.java b/services/core/java/com/android/server/wm/Session.java
index 12f61f9..1f62bc1 100644
--- a/services/core/java/com/android/server/wm/Session.java
+++ b/services/core/java/com/android/server/wm/Session.java
@@ -347,6 +347,13 @@
         return true;    // success!
     }
 
+    public boolean startMovingTask(IWindow window, float startX, float startY) {
+        if (WindowManagerService.DEBUG_TASK_POSITIONING) Slog.d(
+                WindowManagerService.TAG, "startMovingTask: {" + startX + "," + startY + "}");
+
+        return mService.startMovingTask(window, startX, startY);
+    }
+
     public void reportDropResult(IWindow window, boolean consumed) {
         IBinder token = window.asBinder();
         if (WindowManagerService.DEBUG_DRAG) {