Define light position (using new lighting spec) in Java

Also updates the relative shadow strengths.

Change-Id: I6cac7275d38df98aea9f0dda463cd7207102986a
diff --git a/libs/hwui/LayerRenderer.h b/libs/hwui/LayerRenderer.h
index 40e461a..e79e7b8 100644
--- a/libs/hwui/LayerRenderer.h
+++ b/libs/hwui/LayerRenderer.h
@@ -47,7 +47,7 @@
     ANDROID_API LayerRenderer(Layer* layer);
     virtual ~LayerRenderer();
 
-    virtual void setViewport(int width, int height);
+    virtual void onViewportInitialized(int width, int height) { /* do nothing */ }
     virtual status_t prepareDirty(float left, float top, float right, float bottom, bool opaque);
     virtual status_t clear(float left, float top, float right, float bottom, bool opaque);
     virtual void finish();