Fix possible infinite loop in test code

Also handle ResourceBusyException

merge of http://go/wvgerrit/14470 from widevine repo

bug: 21172957
Change-Id: I6815786eb7a678725cf2632f1009c7f566ba7499

libwvdrmengine/test/java/src/com/widevine/test/MediaDrmAPITest.java

@@ -244,22 +244,25 @@ public class MediaDrmAPITest extends Activity {
 
     private byte[] openSession(MediaDrm drm) {
         byte[] sessionId = null;
-        boolean retryOpen;
-        do {
+        int retryCount = 3;
+        while (--retryCount > 0) {
             try {
-                retryOpen = false;
                 sessionId = drm.openSession();
+                break;
             } catch (NotProvisionedException e) {
                 Log.i(TAG, "Missing certificate, provisioning");
                 ProvisionRequester provisionRequester = new ProvisionRequester();
                 provisionRequester.doTransact(drm);
-                retryOpen = true;
             } catch (ResourceBusyException e) {
                 Log.w(TAG, "Resource busy in openSession, retrying...");
-                retryOpen = true;
                 sleep(1000);
             }
-        } while (retryOpen);
+        }
+
+        if (retryCount == 0) {
+            Log.e(TAG, "Failed to provision device");
+            mTestFailed = true;
+        }
         return sessionId;
     }