Adds class to translate telephony Connections to Calls.

Adds primitive call model (int callId) translated from telephony
layer's Connection type.
Adds onDisconnect functionality to CallHandlerService.
Makes call Id functional in callHandlerService.

Change-Id: I4d54f4c3f606e5973cc316125486cc361c96d610
diff --git a/Android.mk b/Android.mk
index 9471b36..24d5b71 100644
--- a/Android.mk
+++ b/Android.mk
@@ -6,7 +6,8 @@
 
 LOCAL_JAVA_LIBRARIES := telephony-common voip-common
 LOCAL_STATIC_JAVA_LIBRARIES := com.android.phone.shared \
-        com.android.services.telephony.common
+        com.android.services.telephony.common \
+        guava
 
 LOCAL_SRC_FILES := $(call all-java-files-under, src)
 LOCAL_SRC_FILES += \