Move FastBitmapDrawableTest to Robolectric

Flag: N/A
Bug: 297950111
Test: atest Launcher3RoboTests
Change-Id: Icef741a1c19bb494f7b74078ce1e7f52ed55a769
diff --git a/tests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java b/tests/multivalentTests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java
similarity index 100%
rename from tests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java
rename to tests/multivalentTests/src/com/android/launcher3/icons/FastBitmapDrawableTest.java