Revert of Removing "All Bookmarks"

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

Index: ios/chrome/browser/ui/bookmarks/bookmark_home_handset_view_controller.mm
diff --git a/ios/chrome/browser/ui/bookmarks/bookmark_home_handset_view_controller.mm b/ios/chrome/browser/ui/bookmarks/bookmark_home_handset_view_controller.mm
index 3cf3aa2a9bc80ec4a2facc248c35bb09ba2e1737..ab58a753423e5d4d0159922599f8129d51781252 100644
--- a/ios/chrome/browser/ui/bookmarks/bookmark_home_handset_view_controller.mm
+++ b/ios/chrome/browser/ui/bookmarks/bookmark_home_handset_view_controller.mm
@@ -21,6 +21,7 @@
 #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_collection_cells.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_edit_view_controller.h"
 #import "ios/chrome/browser/ui/bookmarks/bookmark_folder_collection_view.h"
@@ -67,6 +68,7 @@
 // time, it contains exactly one of the BookmarkCollectionView subclasses.
 @property(nonatomic, retain) UIView* 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.
@@ -119,6 +121,7 @@
 // view has been 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'.
@@ -216,6 +219,7 @@
 @end
 
 @implementation BookmarkHomeHandsetViewController
+@synthesize allItemsView = _allItemsView;
 @synthesize contentView = _contentView;
 @synthesize folderView = _folderView;
 @synthesize waitForModelView = _waitForModelView;
@@ -253,6 +257,7 @@
 }
 
 - (void)dealloc {
+  _allItemsView.delegate = nil;
   _folderView.delegate = nil;
 
   _menuView.delegate = nil;
@@ -375,6 +380,21 @@
   }
 }
 
+- (void)ensureAllViewExists {
+  if (self.allItemsView)
+    return;
+
+  base::scoped_nsobject<BookmarkAllCollectionView> view(
+      [[BookmarkAllCollectionView alloc]
+          initWithBrowserState:self.browserState
+                         frame:[self frameForPrimaryView]]);
+  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;
@@ -403,6 +423,9 @@
   self.primaryMenuItem = menuItem;
 
   switch (self.primaryMenuItem.type) {
+    case bookmarks::MenuItemAll:
+      [self ensureAllViewExists];
+      break;
     case bookmarks::MenuItemFolder:
       [self ensureFolderViewExists];
       [self.folderView resetFolder:self.primaryMenuItem.folder];
@@ -429,6 +452,8 @@
 
 - (UIView<BookmarkHomePrimaryView>*)primaryView {
   switch (self.primaryMenuItem.type) {
+    case bookmarks::MenuItemAll:
+      return self.allItemsView;
     case bookmarks::MenuItemFolder:
       return self.folderView;
     case bookmarks::MenuItemDivider:
@@ -1132,6 +1157,15 @@
 #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]];
 }