Use SkTouchGesture to handle pinch events in Android SampleApp.

http://codereview.appspot.com/4631043/


git-svn-id: http://skia.googlecode.com/svn/trunk@1624 2bbb7eff-a529-9590-31e7-b0007b416f81
diff --git a/samplecode/SampleApp.h b/samplecode/SampleApp.h
index 37a3d09..25e3964 100644
--- a/samplecode/SampleApp.h
+++ b/samplecode/SampleApp.h
@@ -58,6 +58,8 @@
     void changeZoomLevel(float delta);
     bool nextSample();
     bool previousSample();
+    bool handleTouch(int ownerId, float x, float y,
+            SkView::Click::State state);
 
 protected:
     virtual void onDraw(SkCanvas* canvas);