[Offline pages] Fixing restoring bookmarks filter, when offline pages disabled

Ensures that when enhanced bookmarks UI is restoring the past filter
for content saved offline, and offline pages are disabled, it is treating
the state as invalid and reverts to the all bookmarks state.

BUG=581976

Review URL: https://codereview.chromium.org/1656103002

Cr-Commit-Position: refs/heads/master@{#372983}
(cherry picked from commit d1b363e7940c0b5cbc5eebd333af929b0d60032a)

Review URL: https://codereview.chromium.org/1662563002 .

Cr-Commit-Position: refs/branch-heads/2623@{#241}
Cr-Branched-From: 92d77538a86529ca35f9220bd3cd512cbea1f086-refs/heads/master@{#369907}

2 files changed, 16 insertions, 2 deletions

diff --git a/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUIState.java b/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUIState.java
index 20dbdf0..21557dd 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUIState.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkUIState.java
@@ -8,6 +8,7 @@ import android.net.Uri;
 import android.text.TextUtils;
 
 import org.chromium.chrome.browser.UrlConstants;
+import org.chromium.chrome.browser.offlinepages.OfflinePageBridge;
 import org.chromium.components.bookmarks.BookmarkId;
 
 /**
@@ -151,8 +152,13 @@ class EnhancedBookmarkUIState {
                     && !mFolder.equals(bookmarkModel.getRootFolderId());
         }
 
-        if (mState == STATE_FILTER && mFilter == null) return false;
+        if (mState == STATE_FILTER) {
+            if (mFilter == null) return false;
+            if (mFilter == EnhancedBookmarkFilter.OFFLINE_PAGES) {
+                return OfflinePageBridge.isEnabled();
+            }
+        }
 
         return true;
     }
-}
\ No newline at end of file
+}
diff --git a/chrome/android/javatests/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkTest.java b/chrome/android/javatests/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkTest.java
index e21b815..5bfccce 100644
--- a/chrome/android/javatests/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkTest.java
+++ b/chrome/android/javatests/src/org/chromium/chrome/browser/enhancedbookmarks/EnhancedBookmarkTest.java
@@ -241,4 +241,12 @@ public class EnhancedBookmarkTest extends ChromeActivityTestCaseBase<ChromeActiv
         assertEquals(UrlConstants.BOOKMARKS_URL,
                 EnhancedBookmarkUtils.getLastUsedUrl(getActivity()));
     }
+
+    @SmallTest
+    @CommandLineFlags.Add(ChromeSwitches.DISABLE_OFFLINE_PAGES)
+    public void testOpenBookmarkManagerInOfflinePageWhenDisabled() throws InterruptedException {
+        openBookmarkManager("chrome-native://bookmarks/filter/OFFLINE_PAGES");
+        EnhancedBookmarkDelegate delegate = mItemsContainer.getDelegateForTesting();
+        assertEquals(EnhancedBookmarkUIState.STATE_ALL_BOOKMARKS, delegate.getCurrentState());
+    }
 }