Replace existing Robolectric test task with functioning one.

This CL does the following:
- Creates a dir for multivalentTests
- Creates symlinks for the dir to keep Android Studio happy
- Moves many files to the multivalentTests dir
- Adjusts gradle and soong build files to use the new dir as part of
their source sets.

Test: ./gradlew :NexusLauncher:testGoogleWithQuickstepDebugUnitTest
Test: atest Launcher3RoboTests
Fix: 316553886
Bug: 316553889
Flag: NA
Change-Id: Iae28fd0c0191b3ecf9bd2950800875950cca2622

tests/multivalentTests/shared/com/android/launcher3/testing/shared/HotseatCellCenterRequest.java

@@ -0,0 +1,99 @@
+/*
+ * Copyright (C) 2022 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.
+ */
+
+package com.android.launcher3.testing.shared;
+
+import android.os.Parcel;
+import android.os.Parcelable;
+
+/**
+ * Request object for querying a hotseat cell region in Rect.
+ */
+public class HotseatCellCenterRequest implements TestInformationRequest {
+    public final int cellInd;
+
+    @Override
+    public int describeContents() {
+        return 0;
+    }
+
+    @Override
+    public void writeToParcel(Parcel dest, int flags) {
+        dest.writeInt(cellInd);
+    }
+
+    @Override
+    public String getRequestName() {
+        return TestProtocol.REQUEST_HOTSEAT_CELL_CENTER;
+    }
+
+    public static final Parcelable.Creator<HotseatCellCenterRequest> CREATOR =
+            new Parcelable.Creator<HotseatCellCenterRequest>() {
+
+                @Override
+                public HotseatCellCenterRequest createFromParcel(Parcel source) {
+                    return new HotseatCellCenterRequest(source);
+                }
+
+                @Override
+                public HotseatCellCenterRequest[] newArray(int size) {
+                    return new HotseatCellCenterRequest[size];
+                }
+            };
+
+    private HotseatCellCenterRequest(int cellInd) {
+        this.cellInd = cellInd;
+    }
+
+    private HotseatCellCenterRequest(Parcel in) {
+        this(in.readInt());
+    }
+
+    /**
+     * Create a builder for HotseatCellCenterRequest.
+     *
+     * @return HotseatCellCenterRequest builder.
+     */
+    public static HotseatCellCenterRequest.Builder builder() {
+        return new HotseatCellCenterRequest.Builder();
+    }
+
+    /**
+     * HotseatCellCenterRequest Builder.
+     */
+    public static final class Builder {
+        private int mCellInd;
+
+        private Builder() {
+            mCellInd = 0;
+        }
+
+        /**
+         * Set the index of hotseat cells.
+         */
+        public HotseatCellCenterRequest.Builder setCellInd(int i) {
+            this.mCellInd = i;
+            return this;
+        }
+
+        /**
+         * build the HotseatCellCenterRequest.
+         */
+        public HotseatCellCenterRequest build() {
+            return new HotseatCellCenterRequest(mCellInd);
+        }
+    }
+}