Frameworks/base: Wall Werror in libs/input

Enable -Wall -Werror in libs/input. Mask warnings from Skia.

Change-Id: I0deeffde07fcf3a09eadec2852e9bf5666b55ee8
diff --git a/libs/input/PointerController.cpp b/libs/input/PointerController.cpp
index 9af521b..1152737 100644
--- a/libs/input/PointerController.cpp
+++ b/libs/input/PointerController.cpp
@@ -25,11 +25,14 @@
 
 #include <cutils/log.h>
 
+#pragma GCC diagnostic push
+#pragma GCC diagnostic ignored "-Wunused-parameter"
 #include <SkBitmap.h>
 #include <SkCanvas.h>
 #include <SkColor.h>
 #include <SkPaint.h>
 #include <SkXfermode.h>
+#pragma GCC diagnostic pop
 
 namespace android {