Avoid 9patch cache lookups when possible

This optimization saves up to 0.3ms per frame on the Play Store's
front page, on a Nexus 4 device.

Change-Id: Iaa4ef33c6e3b37e175efd5b9eea9ef59b43f14f3
diff --git a/libs/hwui/LayerRenderer.cpp b/libs/hwui/LayerRenderer.cpp
index 79e0b0c..cfb1e97 100644
--- a/libs/hwui/LayerRenderer.cpp
+++ b/libs/hwui/LayerRenderer.cpp
@@ -467,7 +467,7 @@
             mat4 texTransform(layer->getTexTransform());
 
             mat4 invert;
-            invert.translate(0.0f, 1.0f, 0.0f);
+            invert.translate(0.0f, 1.0f);
             invert.scale(1.0f, -1.0f, 1.0f);
             layer->getTexTransform().multiply(invert);