QS: Introduce bluetooth control panel.

- Factor out common detail item panel view, share with Wifi.
- Add an empty state (large icon + text)
- Implement connect / disconnect for supported BT profiles.
- Wire up "scanning" state, but still waiting on asset.
- Add BT controller info to dump.

Bug:16235253
Change-Id: Icf854cafba962fe4b63767d7206e309d80b7b87b
diff --git a/packages/SystemUI/res/drawable/ic_qs_wifi_detail_empty.xml b/packages/SystemUI/res/drawable/ic_qs_wifi_detail_empty.xml
new file mode 100644
index 0000000..16fa30b
--- /dev/null
+++ b/packages/SystemUI/res/drawable/ic_qs_wifi_detail_empty.xml
@@ -0,0 +1,28 @@
+<!--
+Copyright (C) 2014 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.
+-->
+<vector xmlns:android="http://schemas.android.com/apk/res/android" >
+    <size
+        android:width="56dp"
+        android:height="56dp"/>
+
+    <viewport
+        android:viewportWidth="48.0"
+        android:viewportHeight="48.0"/>
+
+    <path
+        android:pathData="M24.0,4.0C15.0,4.0 6.7,7.0 0.0,12.0l24.0,32.0l24.0,-32.0C41.3,7.0 33.0,4.0 24.0,4.0z"
+        android:fill="@color/qs_detail_empty" />
+</vector>