Add property to control audio offload with video content

Property audio.offload.video normally disabled (set to 1 to enable)

Bug: 21198655
Change-Id: Ib1c457b1e3950f18d91b855424aa80bd23c723b0
diff --git a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
index 665cce9..82c9e55 100644
--- a/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
+++ b/services/audiopolicy/managerdefault/AudioPolicyManager.cpp
@@ -2031,8 +2031,9 @@
     }
 
     //TODO: enable audio offloading with video when ready
-    if (offloadInfo.has_video)
-    {
+    const bool allowOffloadWithVideo =
+            property_get_bool("audio.offload.video", false /* default_value */);
+    if (offloadInfo.has_video && !allowOffloadWithVideo) {
         ALOGV("isOffloadSupported: has_video == true, returning false");
         return false;
     }