WebView: Activate AndroidWebViewSessionConsistencyTest

This study doesn't do anything except exercise session-consistency.
Query it once to "activate" it, so it shows up in the logs when
WebViewLogVerbosifier.apk is installed, so QA can verify
permanent-consistency.

BUG=866722

Change-Id: I435b6ed5c93e105ebb49705078f4362eb46e109b
Reviewed-on: https://chromium-review.googlesource.com/c/1423837
Commit-Queue: Changwan Ryu <changwan@chromium.org>
Reviewed-by: Changwan Ryu <changwan@chromium.org>
Cr-Commit-Position: refs/heads/master@{#624482}
diff --git a/android_webview/browser/aw_feature_list_creator.cc b/android_webview/browser/aw_feature_list_creator.cc
index cf71dbd..accdc18 100644
--- a/android_webview/browser/aw_feature_list_creator.cc
+++ b/android_webview/browser/aw_feature_list_creator.cc
@@ -169,6 +169,7 @@
   // of permanent-consistency support in WebView.
   // TODO(crbug/917537): Remove this after m73.
   base::FieldTrialList::FindFullName("AndroidWebViewConsistencyTest");
+  base::FieldTrialList::FindFullName("AndroidWebViewSessionConsistencyTest");
 }
 
 void AwFeatureListCreator::CreateFeatureListAndFieldTrials() {