refactor(force invert): use enum/intdef for force dark type in setForceDark() functions

This allows the RenderNode to differentiate between normal force dark
and force force-dark (force invert color). In the next CL we will treat
force invert slightly differently, not allowing devs to opt-out of force
dark in individual Views/RenderNodes.

This also sets us up to specify a "force light" mode for force invert,
if we ever need it.

Bug: 282821643
Test: atest ViewRootImplTest
Change-Id: I8cc0fe099cccabdd09ea072aca1e70527e91e1a8
diff --git a/libs/hwui/utils/ForceDark.h b/libs/hwui/utils/ForceDark.h
new file mode 100644
index 0000000..28538c4b
--- /dev/null
+++ b/libs/hwui/utils/ForceDark.h
@@ -0,0 +1,34 @@
+/*
+ * Copyright (C) 2023 The Android Open Source Project
+ *
+ * Licensed under the Apache License, Version 2.0 (the "License");
+ * you may not use this file except in compliance with the License.
+ * You may obtain a copy of the License at
+ *
+ *      http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+
+#ifndef FORCEDARKUTILS_H
+#define FORCEDARKUTILS_H
+
+namespace android {
+namespace uirenderer {
+
+/**
+ * The type of force dark set on the renderer, if any.
+ *
+ * This should stay in sync with the java @IntDef in
+ * frameworks/base/graphics/java/android/graphics/ForceDarkType.java
+ */
+enum class ForceDarkType : __uint8_t { NONE = 0, FORCE_DARK = 1, FORCE_INVERT_COLOR_DARK = 2 };
+
+} /* namespace uirenderer */
+} /* namespace android */
+
+#endif  // FORCEDARKUTILS_H
\ No newline at end of file