Implement SmartReplyView

SmartReplyView creates and manages smart reply buttons in a
notification.

One-pager:  http://go/1p-smart-reply
PRD:        http://go/srn-prd
Mocks:      http://go/p-notifications
Design doc: http://go/srn-design

Screenshot: https://screenshot.googleplex.com/GT9NGckkFKB.png

Bug: 67765414
Test: Viewed a notification with mock smart replies
Change-Id: I6d90776571a559a2542aa35fa11e6a21969179c0
diff --git a/packages/SystemUI/res/layout/smart_reply_view.xml b/packages/SystemUI/res/layout/smart_reply_view.xml
new file mode 100644
index 0000000..6d53386
--- /dev/null
+++ b/packages/SystemUI/res/layout/smart_reply_view.xml
@@ -0,0 +1,27 @@
+<?xml version="1.0" encoding="utf-8"?>
+
+<!--
+  ~ Copyright (C) 2017 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 -->
+<com.android.systemui.statusbar.policy.SmartReplyView
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    android:id="@+id/smart_reply_view"
+    android:layout_height="wrap_content"
+    android:layout_width="wrap_content"
+    android:layout_gravity="end">
+    <!-- smart_reply_button(s) will be added here. -->
+</com.android.systemui.statusbar.policy.SmartReplyView>
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