QuickCaptureInputConsumer -> OverscrollInputConsumer + plugin

Test: Implemented plugin interface in Compose studiow build in
google_experimental, verified plugin shows up appropriately in
Launcher's home settings screen, verified gesture works if Compose
plugin enabled, and doesn't work if Compose plugin disabled.
Bug: n/a

Change-Id: Ica24ee8fe814ee02a1497a1bfbe7c7a24489b71e

src_plugins/com/android/systemui/plugins/OverscrollPlugin.java

@@ -0,0 +1,44 @@
+/*
+ * Copyright (C) 2019 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.systemui.plugins;
+
+import com.android.systemui.plugins.annotations.ProvidesInterface;
+
+/**
+ * Implement this interface to receive a callback when the user swipes right
+ * to left on the gesture area. It won't fire if the user has quick switched to a previous app
+ * (swiped right) and the current app isn't yet the active one (i.e., if swiping left would take
+ * the user to a more recent app).
+ */
+@ProvidesInterface(action = com.android.systemui.plugins.OverscrollPlugin.ACTION,
+        version = com.android.systemui.plugins.OverlayPlugin.VERSION)
+public interface OverscrollPlugin extends Plugin {
+
+    String ACTION = "com.android.systemui.action.PLUGIN_LAUNCHER_OVERSCROLL";
+    int VERSION = 1;
+
+    String DEVICE_STATE_LOCKED = "Locked";
+    String DEVICE_STATE_LAUNCHER = "Launcher";
+    String DEVICE_STATE_APP = "App";
+    String DEVICE_STATE_UNKNOWN = "Unknown";
+
+    /**
+     * Called when the user completed a right to left swipe in the gesture area.
+     *
+     * @param deviceState One of the DEVICE_STATE_* constants.
+     */
+    void onOverscroll(String deviceState);
+}