bookmarks: Add HasBookmarks() method to BookmarkModel API.

BUG=45551
TEST=out/Debug/unit_tests --gtest_filter=BookmarkModelTest.HasBookmarks

Review URL: http://codereview.chromium.org/3181030

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@57611 0039d316-1c4b-4281-b951-d872f2087c98

3 files changed, 16 insertions, 0 deletions

diff --git a/chrome/browser/bookmarks/bookmark_model.cc b/chrome/browser/bookmarks/bookmark_model.cc
index 7aaf761..c5bc62f 100644
--- a/chrome/browser/bookmarks/bookmark_model.cc
+++ b/chrome/browser/bookmarks/bookmark_model.cc
@@ -343,6 +343,11 @@ void BookmarkModel::GetBookmarks(std::vector<GURL>* urls) {
   }
 }
 
+bool BookmarkModel::HasBookmarks() {
+  AutoLock url_lock(url_lock_);
+  return !nodes_ordered_by_url_set_.empty();
+}
+
 bool BookmarkModel::IsBookmarked(const GURL& url) {
   AutoLock url_lock(url_lock_);
   return IsBookmarkedNoLock(url);
diff --git a/chrome/browser/bookmarks/bookmark_model.h b/chrome/browser/bookmarks/bookmark_model.h
index 988ad7d..e56c58d 100644
--- a/chrome/browser/bookmarks/bookmark_model.h
+++ b/chrome/browser/bookmarks/bookmark_model.h
@@ -249,6 +249,10 @@ class BookmarkModel : public NotificationObserver, public BookmarkService {
   // Returns all the bookmarked urls. This method is thread safe.
   virtual void GetBookmarks(std::vector<GURL>* urls);
 
+  // Returns true if there are bookmarks, otherwise returns false. This method
+  // is thread safe.
+  bool HasBookmarks();
+
   // Returns true if there is a bookmark for the specified URL. This method is
   // thread safe. See BookmarkService for more details on this.
   virtual bool IsBookmarked(const GURL& url);
diff --git a/chrome/browser/bookmarks/bookmark_model_unittest.cc b/chrome/browser/bookmarks/bookmark_model_unittest.cc
index 37fcb01..66459c7 100644
--- a/chrome/browser/bookmarks/bookmark_model_unittest.cc
+++ b/chrome/browser/bookmarks/bookmark_model_unittest.cc
@@ -478,6 +478,13 @@ TEST_F(BookmarkModelTest, GetBookmarksWithDups) {
   ASSERT_TRUE(urls[0] == url);
 }
 
+TEST_F(BookmarkModelTest, HasBookmarks) {
+  const GURL url("http://foo.com/");
+  model.AddURL(model.GetBookmarkBarNode(), 0, ASCIIToUTF16("bar"), url);
+
+  EXPECT_TRUE(model.HasBookmarks());
+}
+
 namespace {
 
 // NotificationObserver implementation used in verifying we've received the