Add blue highlight when tapping 360 panorama button

Bug: 7336676
Change-Id: If16e5aacf1102d0bd7de7ce5d6c90efae4c786f7
diff --git a/res/drawable/transparent_button_background.xml b/res/drawable/transparent_button_background.xml
new file mode 100644
index 0000000..f1cc153
--- /dev/null
+++ b/res/drawable/transparent_button_background.xml
@@ -0,0 +1,6 @@
+<?xml version="1.0" encoding="utf-8"?>
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item android:drawable="@android:color/holo_blue_light" android:state_pressed="true"/>
+    <item android:drawable="@android:color/holo_blue_light" android:state_pressed="true"/>
+    <item android:drawable="@android:color/transparent" android:state_selected="false"/>
+</selector>
\ No newline at end of file