Merge "Constrain 'touch modal' behavior to the activity stack."

import android.content.ClipData;

import android.content.ClipDescription;

import android.graphics.Point;

import android.graphics.Rect;

import android.graphics.Region;

import android.os.IBinder;

import android.os.Message;

    Display mDisplay;

    private final Region mTmpRegion = new Region();

    private final Rect mTmpRect = new Rect();

    DragState(WindowManagerService service, IBinder token, SurfaceControl surface,

            int flags, IBinder localWin) {

                continue;

            }

            child.getStackBounds(mTmpRect);

            if (!mTmpRect.contains(x, y)) {

                // outside of this window's activity stack == don't tell about drags

                continue;

            }

            child.getTouchableRegion(mTmpRegion);

            final int touchFlags = flags &