Adding feature flag for Android Pay v2 Chrome integration.

chrome/app/generated_resources.grd

Index: chrome/app/generated_resources.grd
diff --git a/chrome/app/generated_resources.grd b/chrome/app/generated_resources.grd
index 5f638f60cb05027ebb21613f51a0843385097426..8015ae835f4795516b20bd1d2e16e3b6442f4712 100644
--- a/chrome/app/generated_resources.grd
+++ b/chrome/app/generated_resources.grd
@@ -15453,6 +15453,12 @@ read aloud to screenreader users to announce that a completion is available.">
       <message name="IDS_FLAGS_ENABLE_ANDROID_PAY_INTEGRATION_V1_DESCRIPTION" desc="Description for the flag to enable the first version of Android Pay integration">
         Enable integration with Android Pay using the first version of the API
       </message>
+      <message name="IDS_FLAGS_ENABLE_ANDROID_PAY_INTEGRATION_V2_NAME" desc="Name of the flag to enable the second version of Android Pay integration">

[please use gerrit instead, 2016/12/15 14:27:33]

Mark this non-translatable. Chrome does not translate anything
developer-centric.

[Walter Cacau, 2016/12/15 16:58:16]

Done
should I change the above strings as well? Mostly copy pasted from this CL:
https://codereview.chromium.org/2074553002

[please use gerrit instead, 2016/12/15 17:08:59]

Yes, please.

[Walter Cacau, 2016/12/15 17:27:26]

Done.

+        Enable Android Pay v2
+      </message>
+      <message name="IDS_FLAGS_ENABLE_ANDROID_PAY_INTEGRATION_V2_DESCRIPTION" desc="Description for the flag to enable the second version of Android Pay integration">

[please use gerrit instead, 2016/12/15 14:27:33]

Ditto

[Walter Cacau, 2016/12/15 16:58:16]

Done.

+        Enable integration with Android Pay using the second version of the API
+      </message>
     </if>
 
     <message name="IDS_FLAGS_FEATURE_POLICY_NAME" desc="Name for the flag to enable feature policy.">