Color filters were ignored by the program cache fast path.

Change-Id: I08f2f02d356234a674be778d088e0558fd49c849
diff --git a/libs/hwui/ProgramCache.h b/libs/hwui/ProgramCache.h
index ec9851e..9cb13b3 100644
--- a/libs/hwui/ProgramCache.h
+++ b/libs/hwui/ProgramCache.h
@@ -135,7 +135,7 @@
     GLenum bitmapWrapT;
 
     // Color operations
-    int colorOp;
+    ColorModifier colorOp;
     SkXfermode::Mode colorMode;
 
     // Framebuffer blending (requires Extensions.hasFramebufferFetch())