Replace filterColor with filterColor4f

Although this usage is simple, filterColor is deprecated, so we'd like to move all callers to filterColor4f (which is explicit about color space behavior).

Bug: b/40040795
Change-Id: I0bf541cbb7ff0282dc76a655d2a7a457c887ddb9
diff --git a/libs/hwui/CanvasTransform.cpp b/libs/hwui/CanvasTransform.cpp
index b667daf..30e7a62 100644
--- a/libs/hwui/CanvasTransform.cpp
+++ b/libs/hwui/CanvasTransform.cpp
@@ -137,9 +137,10 @@
         return palette;
     }
 
-    SkColor color = palette == BitmapPalette::Light ? SK_ColorWHITE : SK_ColorBLACK;
-    color = paint->getColorFilter()->filterColor(color);
-    return paletteForColorHSV(color);
+    SkColor4f color = palette == BitmapPalette::Light ? SkColors::kWhite : SkColors::kBlack;
+    sk_sp<SkColorSpace> srgb = SkColorSpace::MakeSRGB();
+    color = paint->getColorFilter()->filterColor4f(color, srgb.get(), srgb.get());
+    return paletteForColorHSV(color.toSkColor());
 }
 
 bool transformPaint(ColorTransform transform, SkPaint* paint) {