Clean unused parameters, disable warnings

Change-Id: Iddb872f53075dd022eeef45265594d1c6a9e2bc0
diff --git a/libs/hwui/SkiaShader.h b/libs/hwui/SkiaShader.h
index a63431c..9fc99a4 100644
--- a/libs/hwui/SkiaShader.h
+++ b/libs/hwui/SkiaShader.h
@@ -192,7 +192,7 @@
             GLuint* textureUnit);
 
 protected:
-    SkiaSweepGradientShader(Type type, float x, float y, uint32_t* colors, float* positions,
+    SkiaSweepGradientShader(Type type, uint32_t* colors, float* positions,
             int count, SkShader* key, SkShader::TileMode tileMode, SkMatrix* matrix, bool blend);
     SkiaSweepGradientShader() {
     }