Add method to get filters for a bookmark in Enhanced bookmark bridge

Per mock:
https://beta-dot-folio.googleplex.com/chrome-ux/mocks/212-stars-iphone/20/phone#%2F05-detail-edit-bookmark.png%3Fc=hidden

All tags/filters associated with a bookmark should be displayed in
enhanced bookmark detail page. This CL introduced related APIs to jni
bridge for UI to retrieve.

BUG=NONE

Review URL: https://codereview.chromium.org/694093002

Cr-Commit-Position: refs/heads/master@{#302365}

chrome/android/java/src/org/chromium/chrome/browser/EnhancedBookmarksBridge.java

@@ -83,17 +83,26 @@ public final class EnhancedBookmarksBridge {
      * Moves a Bookmark in the EnhancedBookmarkModel
      * @param bookmarkId The item to be be moved
      * @param newParentId The new parent of the item
-     * @param index New position index of bookmark within the parent
+     * @param index New position index of bookmark within the parent.
      */
     public void moveBookmark(BookmarkId bookmarkId, BookmarkId newParentId, int index) {
         nativeMoveBookmark(mNativeEnhancedBookmarksBridge, bookmarkId, newParentId, index);
     }
 
+    /**
+     * Get descriptions of a given bookmark.
+     * @param id The id of the bookmark to look at.
+     * @return Description of the bookmark. If given a partner bookmark, this method will return an
+     *         empty list.
+     */
     public String getBookmarkDescription(BookmarkId id) {
         return nativeGetBookmarkDescription(mNativeEnhancedBookmarksBridge, id.getId(),
                 id.getType());
     }
 
+    /**
+     * Sets the description of the given bookmark.
+     */
     public void setBookmarkDescription(BookmarkId id, String description) {
         nativeSetBookmarkDescription(mNativeEnhancedBookmarksBridge, id.getId(), id.getType(),
                 description);
@@ -162,6 +171,18 @@ public final class EnhancedBookmarksBridge {
         mSearchObservers.removeObserver(observer);
     }
 
+    /**
+     * Get all filters associated with the given bookmark.
+     *
+     * @param bookmark The bookmark to find filters for.
+     * @return Array of Strings, each representing a filter. If given a partner bookmark, this
+     *         method will return an empty array.
+     */
+    public String[] getFiltersForBookmark(BookmarkId bookmark) {
+        return nativeGetFiltersForBookmark(mNativeEnhancedBookmarksBridge, bookmark.getId(),
+                bookmark.getType());
+    }
+
     /**
      * @return Current set of known auto-filters for bookmarks.
      */
@@ -206,6 +227,8 @@ public final class EnhancedBookmarksBridge {
     private native List<BookmarkId> nativeGetSearchResults(long nativeEnhancedBookmarksBridge,
             String query);
     private native String[] nativeGetFilters(long nativeEnhancedBookmarksBridge);
+    private native String[] nativeGetFiltersForBookmark(long nativeEnhancedBookmarksBridge, long id,
+            int type);
     private native BookmarkId nativeAddFolder(long nativeEnhancedBookmarksBridge, BookmarkId parent,
             int index, String title);
     private native void nativeMoveBookmark(long nativeEnhancedBookmarksBridge,

chrome/browser/android/enhanced_bookmarks/enhanced_bookmarks_bridge.cc

@@ -65,7 +65,9 @@ void EnhancedBookmarksBridge::Destroy(JNIEnv*, jobject) {
 ScopedJavaLocalRef<jstring> EnhancedBookmarksBridge::GetBookmarkDescription(
     JNIEnv* env, jobject obj, jlong id, jint type) {
   DCHECK(enhanced_bookmark_model_->loaded());
-  DCHECK_EQ(BookmarkType::BOOKMARK_TYPE_NORMAL, type);
+  if (type != BookmarkType::BOOKMARK_TYPE_NORMAL) {
+    return base::android::ConvertUTF8ToJavaString(env, std::string());
+  }
 
   const BookmarkNode* node = bookmarks::GetBookmarkNodeByID(
       enhanced_bookmark_model_->bookmark_model(), static_cast<int64>(id));
@@ -90,6 +92,23 @@ void EnhancedBookmarksBridge::SetBookmarkDescription(JNIEnv* env,
       node, base::android::ConvertJavaStringToUTF8(env, description));
 }
 
+ScopedJavaLocalRef<jobjectArray> EnhancedBookmarksBridge::GetFiltersForBookmark(
+    JNIEnv* env,
+    jobject obj,
+    jlong id,
+    jint type) {
+  DCHECK(enhanced_bookmark_model_->loaded());
+  if (type != BookmarkType::BOOKMARK_TYPE_NORMAL) {
+    return base::android::ToJavaArrayOfStrings(env, std::vector<std::string>());
+  }
+
+  const BookmarkNode* node = bookmarks::GetBookmarkNodeByID(
+        enhanced_bookmark_model_->bookmark_model(), static_cast<int64>(id));
+  std::vector<std::string> filters =
+      cluster_service_->ClustersForBookmark(node);
+  return base::android::ToJavaArrayOfStrings(env, filters);
+}
+
 void EnhancedBookmarksBridge::GetBookmarksForFilter(JNIEnv* env,
                                                     jobject obj,
                                                     jstring j_filter,

chrome/browser/android/enhanced_bookmarks/enhanced_bookmarks_bridge.h

@@ -35,6 +35,11 @@ class EnhancedBookmarksBridge : public BookmarkServerServiceObserver {
                               jint type,
                               jstring description);
 
+  base::android::ScopedJavaLocalRef<jobjectArray> GetFiltersForBookmark(
+      JNIEnv* env,
+      jobject obj,
+      jlong id,
+      jint type);
   void GetBookmarksForFilter(JNIEnv* env,
                              jobject obj,
                              jstring filter,