Fixes NoSuchMethod errors in VCardTest.

The continuous build runs tests with ProGuard enabled. This cases
problem when using methods that are not used in the main code, since
ProGuard strips them from the compiled APK.

This change adds a couple of methods that are needed by one of the
tests.

Bug: 4901557
Change-Id: I2907e3b119d2a8420bb8974a7c410f4d42dd1d67
diff --git a/proguard.flags b/proguard.flags
index 3f2f6e1..f56ffff 100644
--- a/proguard.flags
+++ b/proguard.flags
@@ -2,6 +2,11 @@
   <init>(...);
 }
 
+-keep class com.android.vcard.VCardComposer {
+  boolean init();
+  int getCount();
+}
+
 # Any methods whose name is '*ForTest' are preserved.
 -keep class ** {
   *** *ForTest(...);