Do not allow sign in if Google play service is absent

chrome/android/java/src/org/chromium/chrome/browser/signin/SigninManager.java

Index: chrome/android/java/src/org/chromium/chrome/browser/signin/SigninManager.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninManager.java b/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninManager.java
index 77bbbb5efb193c59b3cedd0060ae845102f79d29..ed56cbf53a7dc3ddcd94c8122ce200cb6076b0d9 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninManager.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/signin/SigninManager.java
@@ -237,7 +237,9 @@ public class SigninManager implements AccountTrackerService.OnSystemAccountsSeed
     public boolean isSignInAllowed() {
         return mSigninAllowedByPolicy && !mFirstRunCheckIsPending && mSignInState == null
                 && ChromeSigninController.get(mContext).getSignedInUser() == null
-                && !ApiCompatibilityUtils.isDemoUser(mContext);
+                && !ApiCompatibilityUtils.isDemoUser(mContext)
+                && ExternalAuthUtils.getInstance().canUseGooglePlayServices(mContext,
+                        new UserRecoverableErrorHandler.Silent());

[gogerald1, 2016/10/07 14:19:28]

It might be late to respond, but this will skip sign in screens silently no
matter it is because GMS is out of date or not available. This will affect the
sign in rate or user experience in region where GMS is available (even though
other apps might trigger GMS update). Better to talk to ewald@ to confirm it.

We usually remind user update GMS through modal error dialog or system
notification like here
https://cs.chromium.org/chromium/src/chrome/android/java/src/org/chromium/chr...
and here
https://cs.chromium.org/chromium/src/chrome/android/java/src/org/chromium/chr....

     }
 
     /**