PlzNavigate: load the fallback URL of intents asynchronously

chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java

Index: chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
index 492a25db1fa12bc8b27cb4a7f5eb24bd160d02ec..08b6015d5b54ecdfa70232251623d1da047d2be1 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/externalnav/ExternalNavigationDelegateImpl.java
@@ -16,6 +16,7 @@ import android.content.pm.PackageManager;
 import android.content.pm.ResolveInfo;
 import android.net.Uri;
 import android.os.Build;
+import android.os.Handler;
 import android.os.StrictMode;
 import android.provider.Browser;
 import android.provider.Telephony;
@@ -490,7 +491,7 @@ public class ExternalNavigationDelegateImpl implements ExternalNavigationDelegat
 
     @Override
     public OverrideUrlLoadingResult clobberCurrentTab(
-            String url, String referrerUrl, Tab tab) {
+            String url, String referrerUrl, final Tab tab) {
         int transitionType = PageTransition.LINK;
         LoadUrlParams loadUrlParams = new LoadUrlParams(url, transitionType);
         if (!TextUtils.isEmpty(referrerUrl)) {
@@ -498,7 +499,16 @@ public class ExternalNavigationDelegateImpl implements ExternalNavigationDelegat
             loadUrlParams.setReferrer(referrer);
         }
         if (tab != null) {
-            tab.loadUrl(loadUrlParams);
+            // Load the URL asynchronously for PlzNavigate.
+            final Handler handler = new Handler();
+            final LoadUrlParams finalParam = loadUrlParams;
+            Runnable openRunnable = new Runnable() {
+                @Override
+                public void run() {
+                    tab.loadUrl(finalParam);
+                }
+            };
+            handler.post(openRunnable);
             return OverrideUrlLoadingResult.OVERRIDE_WITH_CLOBBERING_TAB;
         } else {
             assert false : "clobberCurrentTab was called with an empty tab.";