Implement AudioTrack.isDirectPlaybackSupported method

The method checks whether the provided AudioFormat can be played
via currently connected output devices w/o SRC or downmixing
by the framework.

The implementation methods are called 'isDirectOutputSupported'
to match APM's terminology.

Bug: 120044865
Test: atest CtsMediaTestCases:AudioTrackTest#testBuilderValidate
Change-Id: I11769f796c34583fb2641415d2faab00ac526123
diff --git a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
index 59c8f10..cf665a9 100644
--- a/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
+++ b/services/audiopolicy/service/AudioPolicyInterfaceImpl.cpp
@@ -936,6 +936,17 @@
     return mAudioPolicyManager->isOffloadSupported(info);
 }
 
+bool AudioPolicyService::isDirectOutputSupported(const audio_config_base_t& config,
+                                                 const audio_attributes_t& attributes) {
+    if (mAudioPolicyManager == NULL) {
+        ALOGV("mAudioPolicyManager == NULL");
+        return false;
+    }
+    Mutex::Autolock _l(mLock);
+    return mAudioPolicyManager->isDirectOutputSupported(config, attributes);
+}
+
+
 status_t AudioPolicyService::listAudioPorts(audio_port_role_t role,
                                             audio_port_type_t type,
                                             unsigned int *num_ports,