Add listener to the AVDC

At the same, merge AVDC and VDC samples into one. Replace make with
gradle build for sample code.

Test: Added new tests, and new demo.
fix:b/34850683

Change-Id: I3fb6532dd1f754ce7b7f2acd51cdb23b901d0780
diff --git a/settings.gradle b/settings.gradle
index 0b3b3d8..580e049 100644
--- a/settings.gradle
+++ b/settings.gradle
@@ -121,6 +121,9 @@
 include ':support-v13-demos'
 project(':support-v13-demos').projectDir = new File(samplesRoot, 'Support13Demos')
 
+include ':support-vector-drawable-demos'
+project(':support-vector-drawable-demos').projectDir = new File(samplesRoot, 'SupportVectorDrawableDemos')
+
 /////////////////////////////
 //
 // External