Implement Apps row for new landing page design

1. Add AppsRowManager to sync the items in drawer.
2. Using sync data in AppsRowManager to create apps item.
3. Make some classes to public or protected for AppsRowManager used.

Bug: 111914879
Test: atest DocumentsUITests
Change-Id: I19d6febeaa75b2928b06cae94e8372a4ef6424a9
diff --git a/res/layout/apps_item.xml b/res/layout/apps_item.xml
new file mode 100644
index 0000000..d1cfdba
--- /dev/null
+++ b/res/layout/apps_item.xml
@@ -0,0 +1,58 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- Copyright (C) 2018 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.
+-->
+
+<LinearLayout
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:layout_width="@dimen/apps_row_item_width"
+    android:layout_height="@dimen/apps_row_item_height"
+    android:orientation="vertical"
+    android:background="@drawable/generic_ripple_background"
+    android:gravity="center">
+
+    <ImageView
+        android:id="@+id/app_icon"
+        android:layout_width="@dimen/apps_row_app_icon_size"
+        android:layout_height="@dimen/apps_row_app_icon_size"
+        android:layout_marginTop="@dimen/apps_row_app_icon_margin_top"
+        android:layout_marginBottom="@dimen/apps_row_app_icon_margin_bottom"
+        android:layout_marginStart="@dimen/apps_row_app_icon_margin_horizontal"
+        android:layout_marginEnd="@dimen/apps_row_app_icon_margin_horizontal"
+        android:background="@drawable/apps_row_icon_background"
+        android:elevation="3dp"/>
+
+    <TextView
+        android:id="@android:id/title"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginStart="@dimen/apps_row_item_text_margin_horizontal"
+        android:layout_marginEnd="@dimen/apps_row_item_text_margin_horizontal"
+        android:textSize="12sp"
+        android:textColor="?android:textColorPrimary"
+        android:maxLines="1"
+        android:ellipsize="end"
+        android:gravity="center"/>
+
+    <ImageView
+        android:id="@+id/exit_icon"
+        android:layout_width="@dimen/apps_row_exit_icon_size"
+        android:layout_height="@dimen/apps_row_exit_icon_size"
+        android:layout_marginTop="@dimen/apps_row_exit_icon_margin_top"
+        android:layout_marginBottom="@dimen/apps_row_exit_icon_margin_bottom"
+        android:scaleType="centerInside"
+        android:src="@drawable/ic_exit_to_app"
+        android:tint="@color/item_action_icon"/>
+
+</LinearLayout>
\ No newline at end of file