[Location Suggestion] Expose feature flag to Java.

This CL exposes the smart suggestion for large downloads feature flag to Java.

Bug: 1118207
Change-Id: I034376b620414ae674a68b927e2aebd419f203c3
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2410960
Commit-Queue: Hung Vu <vuhung@google.com>
Reviewed-by: Min Qin <qinmin@chromium.org>
Reviewed-by: Shakti Sahu <shaktisahu@chromium.org>
Reviewed-by: Xing Liu <xingliu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#807216}

chrome/browser/flags/android/chrome_feature_list.cc

@@ -80,6 +80,7 @@ const base::Feature* kFeaturesExposedToJava[] = {
     &device::kWebAuthPhoneSupport,
     &download::features::kDownloadAutoResumptionNative,
     &download::features::kDownloadLater,
+    &download::features::kSmartSuggestionForLargeDownloads,
     &download::features::kUseDownloadOfflineContentProvider,
     &features::kClearOldBrowsingData,
     &features::kDownloadsLocationChange,

chrome/browser/flags/android/java/src/org/chromium/chrome/browser/flags/ChromeFeatureList.java

@@ -396,6 +396,8 @@ public abstract class ChromeFeatureList {
     public static final String SHARED_CLIPBOARD_UI = "SharedClipboardUI";
     public static final String SHARING_QR_CODE_ANDROID = "SharingQrCodeAndroid";
     public static final String SHOW_TRUSTED_PUBLISHER_URL = "ShowTrustedPublisherURL";
+    public static final String SMART_SUGGESTION_FOR_LARGE_DOWNLOADS =
+            "SmartSuggestionForLargeDownloads";
     public static final String SPANNABLE_INLINE_AUTOCOMPLETE = "SpannableInlineAutocomplete";
     public static final String SPLIT_CACHE_BY_NETWORK_ISOLATION_KEY =
             "SplitCacheByNetworkIsolationKey";