Fix bytesPerPixel for SurfaceTexture

Bug: 27158985
Change-Id: I148a86d76314681eb778292dd0eb64503375f328
diff --git a/libs/hwui/Texture.cpp b/libs/hwui/Texture.cpp
index 49a103c..4f49a35 100644
--- a/libs/hwui/Texture.cpp
+++ b/libs/hwui/Texture.cpp
@@ -28,6 +28,9 @@
 
 static int bytesPerPixel(GLint glFormat) {
     switch (glFormat) {
+    // The wrapped-texture case, usually means a SurfaceTexture
+    case 0:
+        return 0;
     case GL_ALPHA:
         return 1;
     case GL_RGB: