Read later: Fix an issue that cached flag is not added correctly.

Read later needs to be added to ChromeCachedFlags.

TBR=dtrainor@chromium.org

Bug: 1157113
Change-Id: Ie6dc92314603df4e8e44cd684a74a9ad64f4f1b1
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2587622Reviewed-by: Xing Liu <xingliu@chromium.org>
Commit-Queue: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#836369}

chrome/android/java/src/org/chromium/chrome/browser/app/flags/ChromeCachedFlags.java

@@ -78,7 +78,8 @@ public class ChromeCachedFlags {
                 ChromeFeatureList.TABBED_APP_OVERFLOW_MENU_ICONS,
                 ChromeFeatureList.TABBED_APP_OVERFLOW_MENU_REGROUP,
                 ChromeFeatureList.TABBED_APP_OVERFLOW_MENU_THREE_BUTTON_ACTIONBAR,
-                ChromeFeatureList.USE_CHIME_ANDROID_SDK);
+                ChromeFeatureList.USE_CHIME_ANDROID_SDK,
+                ChromeFeatureList.READ_LATER);
         // clang-format on
         CachedFeatureFlags.cacheNativeFlags(featuresToCache);
         CachedFeatureFlags.cacheAdditionalNativeFlags();