Use Search.SOURCE from android-common

The SOURCE (search source identifier) constant is moving
from hidden in android.app.SearchManager to com.android.common.Search.

Part of http://b/issue?id=2429556

Change-Id: I68fa792f2d452aadcb9216f5c780bd082ca5039f
diff --git a/Android.mk b/Android.mk
index 00a8977..9c2a800 100644
--- a/Android.mk
+++ b/Android.mk
@@ -19,6 +19,8 @@
 
 LOCAL_MODULE_TAGS := optional
 
+LOCAL_STATIC_JAVA_LIBRARIES := android-common
+
 LOCAL_SRC_FILES := $(call all-subdir-java-files)
 
 LOCAL_PACKAGE_NAME := Launcher2