Bug 1376982 - Add "action" parameter to the adjust deep link r=nechen

We need to open the accounts page directly to the sign-in page, instead of the default sign-up page

MozReview-Commit-ID: 9uVURY9hVvt

--HG--
extra : rebase_source : bb74c340ffc2773be3bf5ee17b757c8a94825529

mobile/android/base/java/org/mozilla/gecko/LauncherActivity.java

@@ -237,7 +237,7 @@ public class LauncherActivity extends Activity {
         final String accountsToken = intentUri.getQueryParameter(DeepLinkContract.ACCOUNTS_TOKEN_PARAM);
         final String entryPoint = intentUri.getQueryParameter(DeepLinkContract.ACCOUNTS_ENTRYPOINT_PARAM);
 
-        String dispatchUri = AboutPages.ACCOUNTS + "?";
+        String dispatchUri = AboutPages.ACCOUNTS + "?action=signin&";
 
         // If token is missing from the deep-link, we'll still open the accounts page.
         if (accountsToken != null) {