Add quick search bar width unfold animation

Adds unfold animation to quick search bar in launcher
which changes the width of the quick search bar
from 70% to 100%.

Bug: 193795041
Test: manual
Change-Id: I8c55ca1cc5b5894847503beac8ecd8adec3e5674

src/com/android/launcher3/util/HorizontalInsettableView.java

@@ -0,0 +1,35 @@
+/*
+ * Copyright (C) 2021 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.util;
+
+/**
+ * Allows the implementing view to add insets to the left and right.
+ */
+public interface HorizontalInsettableView {
+
+    /**
+     * Sets left and right insets for the view so it looks like the width of the view is
+     * reduced when inset is increased.
+     *
+     * The inset is calculated based on the width of the view: e.g. when the width of
+     * the view is 100px then if we apply 0.15f horizontal inset percentage the rendered width
+     * of the view will be 70px with 15px of padding on the left and right sides.
+     *
+     * @param insetPercentage width percentage to inset the content from the left and from the right
+     */
+    void setHorizontalInsets(float insetPercentage);
+
+}