Add icon recents fragment for IconRecents

Split out overview_panel from recents and override it with IconRecents
version to replace the recents view entirely.

Currently, on the IconRecents build variant, as expected, this hits a
class cast exception since many quickstep classes assume the overview
panel is an instance of RecentsView. All other variants build and push
fine.

Bug: 114136250
Test: Build + push NexusLauncherDebug, Launcher3Go,
Launcher3GoQuickstep, Launcher3GoQuickstepIconRecents
Change-Id: I3ac7331772e53ee81cb1735a709b4fb7b3bdb78c

go/quickstep/res/layout/icon_recents_root_view.xml

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     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.
+-->
+<!-- TODO(114136250): Remove this temporary placeholder view for Go recents -->
+<TextView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent"
+    android:gravity="center"
+    android:text="Stub!"
+    android:textSize="40sp"/>

go/quickstep/res/layout/overview_panel.xml

@@ -0,0 +1,21 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     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.
+-->
+<fragment android:name="com.android.quickstep.IconRecentsFragment"
+          xmlns:android="http://schemas.android.com/apk/res/android"
+          android:id="@+id/low_ram_recents_fragment"
+          android:layout_width="match_parent"
+          android:layout_height="match_parent"/>

go/quickstep/src/com/android/quickstep/IconRecentsFragment.java

@@ -0,0 +1,37 @@
+/*
+ * 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.quickstep;
+
+import android.app.Fragment;
+import android.os.Bundle;
+import android.view.LayoutInflater;
+import android.view.View;
+import android.view.ViewGroup;
+
+import androidx.annotation.NonNull;
+import androidx.annotation.Nullable;
+
+import com.android.launcher3.R;
+
+public class IconRecentsFragment extends Fragment {
+    @Nullable
+    @Override
+    public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container,
+            @Nullable Bundle savedInstanceState) {
+        return inflater.inflate(R.layout.icon_recents_root_view, container, false);
+    }
+}