Cache flag of layout change to avoid crash on config change

There is no guarantee native will be initialized when
onConfigurationChanged is called

Bug: 1162510
Change-Id: Iac48e4dc0c9ab3c6a080a72afeee52657fd32aa8
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2606874
Commit-Queue: Lijin Shen <lazzzis@google.com>
Reviewed-by: Theresa  <twellington@chromium.org>
Cr-Commit-Position: refs/heads/master@{#840298}

chrome/android/java/src/org/chromium/chrome/browser/app/ChromeActivity.java

@@ -40,6 +40,7 @@
 import org.chromium.base.Callback;
 import org.chromium.base.CommandLine;
 import org.chromium.base.ContextUtils;
+import org.chromium.base.FeatureList;
 import org.chromium.base.MathUtils;
 import org.chromium.base.StrictModeContext;
 import org.chromium.base.SysUtils;
@@ -1813,7 +1814,8 @@ public boolean backShouldCloseTab(Tab tab) {
     @Override
     public void performOnConfigurationChanged(Configuration newConfig) {
         super.performOnConfigurationChanged(newConfig);
-        if (ChromeFeatureList.isEnabled(ChromeFeatureList.ANDROID_LAYOUT_CHANGE_TAB_REPARENT)
+        if (FeatureList.isInitialized()
+                && ChromeFeatureList.isEnabled(ChromeFeatureList.ANDROID_LAYOUT_CHANGE_TAB_REPARENT)
                 && didChangeTabletMode()) {
             onScreenLayoutSizeChange();
             return;