Adding missing SurfaceView methods

Some methods were not implemented in the mock SurfaceView and they were
causing some custom components to fail on the preview.

Bug: http://b.android.com/158592
Test: This is a mock class, not tested.
Change-Id: Id8faa7e6b5edf1238b02ae07f3dd59dc6539cb62

tools/layoutlib/bridge/src/android/view/SurfaceView.java

@@ -21,6 +21,7 @@ import com.android.layoutlib.bridge.MockView;
 import android.content.Context;
 import android.graphics.Canvas;
 import android.graphics.Rect;
+import android.graphics.Region;
 import android.util.AttributeSet;
 
 /**
@@ -49,6 +50,19 @@ public class SurfaceView extends MockView {
         super(context, attrs, defStyleAttr, defStyleRes);
     }
 
+    public boolean gatherTransparentRegion(Region region) {
+      return false;
+    }
+
+    public void setZOrderMediaOverlay(boolean isMediaOverlay) {
+    }
+
+    public void setZOrderOnTop(boolean onTop) {
+    }
+
+    public void setSecure(boolean isSecure) {
+    }
+
     public SurfaceHolder getHolder() {
         return mSurfaceHolder;
     }