Revert of Removing "All Bookmarks"

ios/chrome/browser/ui/bookmarks/bookmark_home_tablet_ntp_controller.mm

Index: ios/chrome/browser/ui/bookmarks/bookmark_home_tablet_ntp_controller.mm
diff --git a/ios/chrome/browser/ui/bookmarks/bookmark_home_tablet_ntp_controller.mm b/ios/chrome/browser/ui/bookmarks/bookmark_home_tablet_ntp_controller.mm
index 82be0d6b6e1258d9814fdb413fc2031272e631da..e4e521b936e50d6b08fa19c8c4c9ebf20f57ef26 100644
--- a/ios/chrome/browser/ui/bookmarks/bookmark_home_tablet_ntp_controller.mm
+++ b/ios/chrome/browser/ui/bookmarks/bookmark_home_tablet_ntp_controller.mm
@@ -24,6 +24,7 @@
 #import "ios/chrome/browser/ui/alert_coordinator/action_sheet_coordinator.h"
 #import "ios/chrome/browser/ui/bookmarks/bars/bookmark_editing_bar.h"
 #import "ios/chrome/browser/ui/bookmarks/bars/bookmark_navigation_bar.h"
+#import "ios/chrome/browser/ui/bookmarks/bookmark_all_collection_view.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_folder_collection_view.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_folder_editor_view_controller.h"
@@ -130,6 +131,7 @@
 // time, it contains exactly one of the BookmarkCollectionView subclasses.
 @property(nonatomic, retain) ContentView* contentView;
 // The possible views that can be shown from the menu.
+@property(nonatomic, retain) BookmarkAllCollectionView* allItemsView;
 @property(nonatomic, retain) BookmarkFolderCollectionView* folderView;
 // This view is created and used if the model is not fully loaded yet by the
 // time this controller starts.
@@ -183,6 +185,7 @@
 // loaded, and the bookmark model is loaded.
 - (void)loadBookmarkViews;
 // If the view doesn't exist, create it.
+- (void)ensureAllViewExists;
 - (void)ensureFolderViewExists;
 // Updates the property 'primaryMenuItem'.
 // Updates the UI to reflect the new state of 'primaryMenuItem'.
@@ -279,6 +282,7 @@
 @synthesize bookmarks = _bookmarks;
 
 @synthesize contentView = _contentView;
+@synthesize allItemsView = _allItemsView;
 @synthesize folderView = _folderView;
 @synthesize waitForModelView = _waitForModelView;
 
@@ -325,6 +329,7 @@
 - (void)dealloc {
   _contentView.delegate = nil;
 
+  _allItemsView.delegate = nil;
   _folderView.delegate = nil;
 
   _menuView.delegate = nil;
@@ -501,6 +506,20 @@
   }
 }
 
+- (void)ensureAllViewExists {
+  if (self.allItemsView)
+    return;
+
+  base::scoped_nsobject<BookmarkAllCollectionView> view(
+      [[BookmarkAllCollectionView alloc] initWithBrowserState:self.browserState
+                                                        frame:CGRectZero]);
+  self.allItemsView = view;
+  self.allItemsView.delegate = self;
+  [self.allItemsView setEditing:self.editing animated:NO];
+  self.allItemsView.autoresizingMask =
+      UIViewAutoresizingFlexibleHeight | UIViewAutoresizingFlexibleWidth;
+}
+
 - (void)ensureFolderViewExists {
   if (self.folderView)
     return;
@@ -528,6 +547,9 @@
   self.primaryMenuItem = menuItem;
 
   switch (self.primaryMenuItem.type) {
+    case bookmarks::MenuItemAll:
+      [self ensureAllViewExists];
+      break;
     case bookmarks::MenuItemFolder:
       [self ensureFolderViewExists];
       [self.folderView resetFolder:self.primaryMenuItem.folder];
@@ -561,6 +583,8 @@
   DCHECK([self contentView]);
 
   switch (self.primaryMenuItem.type) {
+    case bookmarks::MenuItemAll:
+      return self.allItemsView;
     case bookmarks::MenuItemFolder:
       return self.folderView;
     case bookmarks::MenuItemDivider:
@@ -1300,6 +1324,14 @@
 #pragma mark - BookmarkPromoControllerDelegate
 
 - (void)promoStateChanged:(BOOL)promoEnabled {
+  [self.allItemsView.collectionView reloadData];
+  // This is required to workaround a crash seen once on iOS 7.1 when
+  // the collection gets two reloadData without getting a call to layout
+  // subviews, the collection view will reuse some cached data for the perfoming
+  // the layout which are invalid after the second call to reloadData.
+  // Forcing the layout invalidation after each reloadData seems to fix the
+  // issue.
+  [self.allItemsView.collectionView.collectionViewLayout invalidateLayout];
   [self.folderView
       promoStateChangedAnimated:self.folderView == [self primaryView]];
 }