Adjust light source for window position

Bug: 16523629
Change-Id: I2f3fed1edcac0a3cfd5034aded45e08ececfebaf
diff --git a/libs/hwui/OpenGLRenderer.h b/libs/hwui/OpenGLRenderer.h
index c34eb2c..218818d 100755
--- a/libs/hwui/OpenGLRenderer.h
+++ b/libs/hwui/OpenGLRenderer.h
@@ -127,8 +127,9 @@
     void setViewport(int width, int height) { mState.setViewport(width, height); }
 
     void initProperties();
-    void initLight(const Vector3& lightCenter, float lightRadius,
-            uint8_t ambientShadowAlpha, uint8_t spotShadowAlpha);
+    void initLight(float lightRadius, uint8_t ambientShadowAlpha,
+            uint8_t spotShadowAlpha);
+    void setLightCenter(const Vector3& lightCenter);
 
     /*
      * Prepares the renderer to draw a frame. This method must be invoked