Rename GoogleLandingController to GoogleLandingViewController

ios/chrome/browser/ui/ntp/google_landing_controller.mm

Index: ios/chrome/browser/ui/ntp/google_landing_controller.mm
diff --git a/ios/chrome/browser/ui/ntp/google_landing_controller.mm b/ios/chrome/browser/ui/ntp/google_landing_controller.mm
deleted file mode 100644
index ad8b82d60c0d6055fe342734977efbdab328b378..0000000000000000000000000000000000000000
--- a/ios/chrome/browser/ui/ntp/google_landing_controller.mm
+++ /dev/null
@@ -1,1523 +0,0 @@
-// Copyright 2013 The Chromium Authors. All rights reserved.
-// Use of this source code is governed by a BSD-style license that can be
-// found in the LICENSE file.
-
-#import "ios/chrome/browser/ui/ntp/google_landing_controller.h"
-
-#include <algorithm>
-
-#include "base/mac/foundation_util.h"
-#include "base/metrics/user_metrics.h"
-#include "base/strings/sys_string_conversions.h"
-#include "components/strings/grit/components_strings.h"
-#import "ios/chrome/browser/ui/commands/UIKit+ChromeExecuteCommand.h"
-#import "ios/chrome/browser/ui/commands/generic_chrome_command.h"
-#include "ios/chrome/browser/ui/commands/ios_command_ids.h"
-#import "ios/chrome/browser/ui/context_menu/context_menu_coordinator.h"
-#import "ios/chrome/browser/ui/ntp/google_landing_data_source.h"
-#import "ios/chrome/browser/ui/ntp/most_visited_cell.h"
-#import "ios/chrome/browser/ui/ntp/most_visited_layout.h"
-#import "ios/chrome/browser/ui/ntp/new_tab_page_header_constants.h"
-#import "ios/chrome/browser/ui/ntp/new_tab_page_header_view.h"
-#import "ios/chrome/browser/ui/ntp/whats_new_header_view.h"
-#import "ios/chrome/browser/ui/overscroll_actions/overscroll_actions_controller.h"
-#import "ios/chrome/browser/ui/toolbar/web_toolbar_controller.h"
-#include "ios/chrome/browser/ui/ui_util.h"
-#import "ios/chrome/browser/ui/uikit_ui_util.h"
-#import "ios/chrome/browser/ui/url_loader.h"
-#include "ios/chrome/common/string_util.h"
-#include "ios/chrome/grit/ios_strings.h"
-#import "ios/third_party/material_components_ios/src/components/Snackbar/src/MaterialSnackbar.h"
-#import "ios/third_party/material_components_ios/src/components/Typography/src/MaterialTypography.h"
-#import "ios/web/public/web_state/context_menu_params.h"
-#import "net/base/mac/url_conversions.h"
-#include "ui/base/l10n/l10n_util.h"
-#include "ui/base/page_transition_types.h"
-
-using base::UserMetricsAction;
-
-namespace {
-
-enum {
-  SectionWithOmnibox,
-  SectionWithMostVisited,
-  NumberOfCollectionViewSections,
-};
-
-enum InterfaceOrientation {
-  ALL,
-  IPHONE_LANDSCAPE,
-};
-
-const CGFloat kVoiceSearchButtonWidth = 48;
-const UIEdgeInsets kSearchBoxStretchInsets = {3, 3, 3, 3};
-
-// Height for the doodle frame when Google is not the default search engine.
-const CGFloat kNonGoogleSearchDoodleHeight = 60;
-// Height for the header view on tablet when Google is not the default search
-// engine.
-const CGFloat kNonGoogleSearchHeaderHeightIPad = 10;
-
-const CGFloat kHintLabelSidePadding = 12;
-const CGFloat kNTPSearchFieldBottomPadding = 16;
-const CGFloat kWhatsNewHeaderHiddenHeight = 8;
-const CGFloat kDoodleTopMarginIPadPortrait = 82;
-const CGFloat kDoodleTopMarginIPadLandscape = 82;
-const NSInteger kMaxNumMostVisitedFaviconRows = 2;
-const CGFloat kMaxSearchFieldFrameMargin = 200;
-const CGFloat kShiftTilesDownAnimationDuration = 0.2;
-
-const CGFloat kMostVisitedPaddingIPhone = 16;
-const CGFloat kMostVisitedPaddingIPadFavicon = 24;
-
-}  // namespace
-
-@interface GoogleLandingController (UsedByGoogleLandingView)
-// Update frames for subviews depending on the interface orientation.
-- (void)updateSubviewFrames;
-// Resets the collection view's inset to 0.
-- (void)resetSectionInset;
-- (void)reloadData;
-@end
-
-// Subclassing the main UIScrollView allows calls for setFrame.
-@interface GoogleLandingView : UIView {
-  GoogleLandingController* _googleLanding;
-}
-
-- (void)setFrameDelegate:(GoogleLandingController*)delegate;
-
-@end
-
-@implementation GoogleLandingView
-
-- (void)setFrameDelegate:(GoogleLandingController*)delegate {
-  _googleLanding = delegate;
-}
-
-- (void)setFrame:(CGRect)frame {
-  // On iPad and in fullscreen, the collection view's inset is very large.
-  // When Chrome enters slide over mode, the previously set inset is larger than
-  // the newly set collection view's width, which makes the collection view
-  // throw an exception.
-  // To prevent this from happening, we reset the inset to 0 before changing the
-  // frame.
-  [_googleLanding resetSectionInset];
-  [super setFrame:frame];
-  [_googleLanding updateSubviewFrames];
-  [_googleLanding reloadData];
-}
-
-@end
-
-@interface GoogleLandingController ()<OverscrollActionsControllerDelegate,
-                                      UICollectionViewDataSource,
-                                      UICollectionViewDelegate,
-                                      UICollectionViewDelegateFlowLayout,
-                                      UIGestureRecognizerDelegate,
-                                      WhatsNewHeaderViewDelegate> {
-  // Fake omnibox.
-  base::scoped_nsobject<UIButton> _searchTapTarget;
-
-  // A collection view for the most visited sites.
-  base::scoped_nsobject<UICollectionView> _mostVisitedView;
-
-  // The overscroll actions controller managing accelerators over the toolbar.
-  base::scoped_nsobject<OverscrollActionsController>
-      _overscrollActionsController;
-
-  // |YES| when notifications indicate the omnibox is focused.
-  BOOL _omniboxFocused;
-
-  // Tap and swipe gesture recognizers when the omnibox is focused.
-  base::scoped_nsobject<UITapGestureRecognizer> _tapGestureRecognizer;
-  base::scoped_nsobject<UISwipeGestureRecognizer> _swipeGestureRecognizer;
-
-  // Handles displaying the context menu for all form factors.
-  base::scoped_nsobject<ContextMenuCoordinator> _contextMenuCoordinator;
-
-  // URL of the last deleted most viewed entry. If present the UI to restore it
-  // is shown.
-  base::scoped_nsobject<NSURL> _deletedUrl;
-
-  // |YES| if the view has finished its first layout. This is useful when
-  // determining if the view has sized itself for tablet.
-  BOOL _viewLoaded;
-
-  // |YES| if the fakebox header should be animated on scroll.
-  BOOL _animateHeader;
-
-  // |YES| if the collection scrollView is scrolled all the way to the top. Used
-  // to lock this position in place on various frame changes.
-  BOOL _scrolledToTop;
-
-  // |YES| if this NTP panel is visible.  When set to |NO| various UI updates
-  // are ignored.
-  BOOL _isShowing;
-
-  CFTimeInterval _shiftTilesDownStartTime;
-  CGSize _mostVisitedCellSize;
-  base::scoped_nsobject<NSLayoutConstraint> _hintLabelLeadingConstraint;
-  base::scoped_nsobject<NSLayoutConstraint> _voiceTapTrailingConstraint;
-  base::scoped_nsobject<NSMutableArray> _supplementaryViews;
-  base::scoped_nsobject<NewTabPageHeaderView> _headerView;
-  base::scoped_nsobject<WhatsNewHeaderView> _promoHeaderView;
-}
-
-// Redeclare the |view| property to be the GoogleLandingView subclass instead of
-// a generic UIView.
-@property(nonatomic, readwrite, strong) GoogleLandingView* view;
-
-// Whether the Google logo or doodle is being shown.
-@property(nonatomic, assign) BOOL logoIsShowing;
-
-// Exposes view and methods to drive the doodle.
-@property(nonatomic, assign) id<LogoVendor> logoVendor;
-
-// |YES| if this consumer is incognito.
-@property(nonatomic, assign) BOOL isOffTheRecord;
-
-// |YES| if this consumer is has voice search enabled.
-@property(nonatomic, assign) BOOL voiceSearchIsEnabled;
-
-// Gets the maximum number of sites shown.
-@property(nonatomic, assign) NSUInteger maximumMostVisitedSitesShown;
-
-// Gets the text of a what's new promo.
-@property(nonatomic, retain) NSString* promoText;
-
-// Gets the icon of a what's new promo.
-// TODO(crbug.com/694750): This should not be WhatsNewIcon.
-@property(nonatomic, assign) WhatsNewIcon promoIcon;
-
-// |YES| if a what's new promo can be displayed.
-@property(nonatomic, assign) BOOL promoCanShow;
-
-// The number of tabs to show in the google landing fake toolbar.
-@property(nonatomic, assign) int tabCount;
-
-// |YES| if the google landing toolbar can show the forward arrow, cached and
-// pushed into the header view.
-@property(nonatomic, assign) BOOL canGoForward;
-
-// |YES| if the google landing toolbar can show the back arrow, cached and
-// pushed into the header view.
-@property(nonatomic, assign) BOOL canGoBack;
-
-// iPhone landscape uses a slightly different layout for the doodle and search
-// field frame. Returns the proper frame from |frames| based on orientation,
-// centered in the view.
-- (CGRect)getOrientationFrame:(const CGRect[])frames;
-// Returns the proper frame for the doodle.
-- (CGRect)doodleFrame;
-// Returns the proper frame for the search field.
-- (CGRect)searchFieldFrame;
-// Returns the height to use for the What's New promo view.
-- (CGFloat)promoHeaderHeight;
-// Add fake search field and voice search microphone.
-- (void)addSearchField;
-// Add most visited collection view.
-- (void)addMostVisited;
-// Update the iPhone fakebox's frame based on the current scroll view offset.
-- (void)updateSearchField;
-// Scrolls  most visited to the top of the view when the omnibox is focused.
-- (void)locationBarBecomesFirstResponder;
-// Scroll the view back to 0,0 when the omnibox loses focus.
-- (void)locationBarResignsFirstResponder;
-// When the search field is tapped.
-- (void)searchFieldTapped:(id)sender;
-// Tells WebToolbarController to resign focus to the omnibox.
-- (void)blurOmnibox;
-// Called when a user does a long press on a most visited item.
-- (void)handleMostVisitedLongPress:
-    (UILongPressGestureRecognizer*)longPressGesture;
-// When the user removes a most visited a bubble pops up to undo the action.
-- (void)showMostVisitedUndoForURL:(NSURL*)url;
-// If Google is not the default search engine, hide the logo, doodle and
-// fakebox.
-- (void)updateLogoAndFakeboxDisplay;
-// Helper method to set UICollectionViewFlowLayout insets for most visited.
-- (void)setFlowLayoutInset:(UICollectionViewFlowLayout*)layout;
-// Instructs the UICollectionView and UIView to reload it's data and layout.
-- (void)reloadData;
-// Returns the size of |self.mostVisitedData|.
-- (NSUInteger)numberOfItems;
-// Returns the number of non empty tiles (as opposed to the placeholder tiles).
-- (NSInteger)numberOfNonEmptyTilesShown;
-// Returns the URL for the mosted visited item in |self.mostVisitedData|.
-- (GURL)urlForIndex:(NSUInteger)index;
-// Returns the expected height of the NewTabPageHeaderView.
-- (CGFloat)heightForSectionWithOmnibox;
-// Returns the nearest ancestor view that is kind of |aClass|.
-- (UIView*)nearestAncestorOfView:(UIView*)view withClass:(Class)aClass;
-// Updates the collection view's scroll view offset for the next frame of the
-// shiftTilesDown animation.
-- (void)shiftTilesDownAnimationDidFire:(CADisplayLink*)link;
-// Returns the size to use for Most Visited cells in the NTP.
-- (CGSize)mostVisitedCellSize;
-// Returns the padding for use between Most Visited cells.
-- (CGFloat)mostVisitedCellPadding;
-
-@end
-
-@implementation GoogleLandingController
-
-@dynamic view;
-@synthesize logoVendor = _logoVendor;
-@synthesize dataSource = _dataSource;
-// Property declared in NewTabPagePanelProtocol.
-@synthesize delegate = _delegate;
-@synthesize dispatcher = _dispatcher;
-@synthesize isOffTheRecord = _isOffTheRecord;
-@synthesize logoIsShowing = _logoIsShowing;
-@synthesize promoText = _promoText;
-@synthesize promoIcon = _promoIcon;
-@synthesize promoCanShow = _promoCanShow;
-@synthesize maximumMostVisitedSitesShown = _maximumMostVisitedSitesShown;
-@synthesize tabCount = _tabCount;
-@synthesize canGoForward = _canGoForward;
-@synthesize canGoBack = _canGoBack;
-@synthesize voiceSearchIsEnabled = _voiceSearchIsEnabled;
-
-- (void)loadView {
-  self.view = [[[GoogleLandingView alloc]
-      initWithFrame:[UIScreen mainScreen].bounds] autorelease];
-}
-
-- (void)viewDidLoad {
-  [super viewDidLoad];
-  [self.view setAutoresizingMask:UIViewAutoresizingFlexibleHeight |
-                                 UIViewAutoresizingFlexibleWidth];
-  [self.view setFrameDelegate:self];
-
-  // Initialise |shiftTilesDownStartTime| to a sentinel value to indicate that
-  // the animation has not yet started.
-  _shiftTilesDownStartTime = -1;
-  _mostVisitedCellSize = [self mostVisitedCellSize];
-  _isShowing = YES;
-  _scrolledToTop = NO;
-  _animateHeader = YES;
-
-  _tapGestureRecognizer.reset([[UITapGestureRecognizer alloc]
-      initWithTarget:self
-              action:@selector(blurOmnibox)]);
-  [_tapGestureRecognizer setDelegate:self];
-  _swipeGestureRecognizer.reset([[UISwipeGestureRecognizer alloc]
-      initWithTarget:self
-              action:@selector(blurOmnibox)]);
-  [_swipeGestureRecognizer setDirection:UISwipeGestureRecognizerDirectionDown];
-
-  [self addSearchField];
-  [self addMostVisited];
-  [self addOverscrollActions];
-  [self reload];
-}
-
-- (void)viewDidLayoutSubviews {
-  [self updateSubviewFrames];
-}
-
-- (void)viewWillTransitionToSize:(CGSize)size
-       withTransitionCoordinator:
-           (id<UIViewControllerTransitionCoordinator>)coordinator {
-  [super viewWillTransitionToSize:size withTransitionCoordinator:coordinator];
-
-  void (^alongsideBlock)(id<UIViewControllerTransitionCoordinatorContext>) = ^(
-      id<UIViewControllerTransitionCoordinatorContext> context) {
-    if (IsIPadIdiom() && _scrolledToTop) {
-      // Keep the most visited thumbnails scrolled to the top.
-      [_mostVisitedView setContentOffset:CGPointMake(0, [self pinnedOffsetY])];
-      return;
-    };
-
-    // Invalidate the layout so that the collection view's header size is reset
-    // for the new orientation.
-    if (!_scrolledToTop) {
-      [[_mostVisitedView collectionViewLayout] invalidateLayout];
-    }
-
-    // Call -scrollViewDidScroll: so that the omnibox's frame is adjusted for
-    // the scroll view's offset.
-    [self scrollViewDidScroll:_mostVisitedView];
-
-  };
-  [coordinator animateAlongsideTransition:alongsideBlock completion:nil];
-}
-
-- (void)dealloc {
-  [[NSNotificationCenter defaultCenter] removeObserver:self];
-  [_mostVisitedView setDelegate:nil];
-  [_mostVisitedView setDataSource:nil];
-  [_overscrollActionsController invalidate];
-  [super dealloc];
-}
-
-#pragma mark - Private
-
-- (CGSize)mostVisitedCellSize {
-  if (IsIPadIdiom()) {
-    // On iPads, split-screen and slide-over may require showing smaller cells.
-    CGSize maximumCellSize = [MostVisitedCell maximumSize];
-    CGSize viewSize = self.view.bounds.size;
-    CGFloat smallestDimension =
-        viewSize.height > viewSize.width ? viewSize.width : viewSize.height;
-    CGFloat cellWidth = AlignValueToPixel(
-        (smallestDimension - 3 * [self mostVisitedCellPadding]) / 2);
-    if (cellWidth < maximumCellSize.width) {
-      return CGSizeMake(cellWidth, cellWidth);
-    } else {
-      return maximumCellSize;
-    }
-  } else {
-    return [MostVisitedCell maximumSize];
-  }
-}
-
-- (CGFloat)mostVisitedCellPadding {
-  return IsIPadIdiom() ? kMostVisitedPaddingIPadFavicon
-                       : kMostVisitedPaddingIPhone;
-}
-
-- (CGFloat)viewWidth {
-  return [self.view frame].size.width;
-}
-
-- (int)numberOfColumns {
-  CGFloat width = [self viewWidth];
-  CGFloat padding = [self mostVisitedCellPadding];
-  // Try to fit 4 columns.
-  if (width >= 5 * padding + _mostVisitedCellSize.width * 4)
-    return 4;
-  // Try to fit 3 columns.
-  if (width >= 4 * padding + _mostVisitedCellSize.width * 3)
-    return 3;
-  // Try to fit 2 columns.
-  if (width >= 3 * padding + _mostVisitedCellSize.width * 2)
-    return 2;
-  // We never want to have a layout with only one column, however: At launch,
-  // the view's size is initialized to the width of 320, which can only fit
-  // one column on iPhone 6 and 6+. TODO(crbug.com/506183): Get rid of the
-  // unecessary resize, and add a NOTREACHED() here.
-  return 1;
-}
-
-- (CGFloat)leftMargin {
-  int columns = [self numberOfColumns];
-  CGFloat whitespace = [self viewWidth] - columns * _mostVisitedCellSize.width -
-                       (columns - 1) * [self mostVisitedCellPadding];
-  CGFloat margin = AlignValueToPixel(whitespace / 2);
-  DCHECK(margin >= [self mostVisitedCellPadding]);
-  return margin;
-}
-
-- (CGRect)doodleFrame {
-  const CGRect kDoodleFrame[2] = {
-      {{0, 66}, {0, 120}}, {{0, 56}, {0, 120}},
-  };
-  CGRect doodleFrame = [self getOrientationFrame:kDoodleFrame];
-  if (!IsIPadIdiom() && !self.logoIsShowing)
-    doodleFrame.size.height = kNonGoogleSearchDoodleHeight;
-  if (IsIPadIdiom()) {
-    doodleFrame.origin.y = IsPortrait() ? kDoodleTopMarginIPadPortrait
-                                        : kDoodleTopMarginIPadLandscape;
-  }
-  return doodleFrame;
-}
-
-- (CGRect)searchFieldFrame {
-  CGFloat y = CGRectGetMaxY([self doodleFrame]);
-  CGFloat leftMargin = [self leftMargin];
-  if (leftMargin > kMaxSearchFieldFrameMargin)
-    leftMargin = kMaxSearchFieldFrameMargin;
-  const CGRect kSearchFieldFrame[2] = {
-      {{leftMargin, y + 32}, {0, 50}}, {{leftMargin, y + 16}, {0, 50}},
-  };
-  CGRect searchFieldFrame = [self getOrientationFrame:kSearchFieldFrame];
-  if (IsIPadIdiom()) {
-    CGFloat iPadTopMargin = IsPortrait() ? kDoodleTopMarginIPadPortrait
-                                         : kDoodleTopMarginIPadLandscape;
-    searchFieldFrame.origin.y += iPadTopMargin - 32;
-  }
-  return searchFieldFrame;
-}
-
-- (CGRect)getOrientationFrame:(const CGRect[])frames {
-  UIInterfaceOrientation orient =
-      [[UIApplication sharedApplication] statusBarOrientation];
-  InterfaceOrientation inter_orient =
-      (IsIPadIdiom() || UIInterfaceOrientationIsPortrait(orient))
-          ? ALL
-          : IPHONE_LANDSCAPE;
-
-  // Calculate width based on screen width and origin x.
-  CGRect frame = frames[inter_orient];
-  frame.size.width = fmax(self.view.bounds.size.width - 2 * frame.origin.x, 50);
-  return frame;
-}
-
-- (CGFloat)promoHeaderHeight {
-  CGFloat promoMaxWidth = [self viewWidth] - 2 * [self leftMargin];
-  NSString* text = self.promoText;
-  return [WhatsNewHeaderView heightToFitText:text inWidth:promoMaxWidth];
-}
-
-- (void)updateLogoAndFakeboxDisplay {
-  if (self.logoVendor.showingLogo != self.logoIsShowing) {
-    self.logoVendor.showingLogo = self.logoIsShowing;
-    if (_viewLoaded) {
-      [self updateSubviewFrames];
-
-      // Adjust the height of |_headerView| to fit its content which may have
-      // been shifted due to the visibility of the doodle.
-      CGRect headerFrame = [_headerView frame];
-      headerFrame.size.height = [self heightForSectionWithOmnibox];
-      [_headerView setFrame:headerFrame];
-
-      // Adjust vertical positioning of |_promoHeaderView|.
-      CGFloat omniboxHeaderHeight =
-          [self collectionView:_mostVisitedView
-                                       layout:[_mostVisitedView
-                                                  collectionViewLayout]
-              referenceSizeForHeaderInSection:0]
-              .height;
-      CGRect whatsNewFrame = [_promoHeaderView frame];
-      whatsNewFrame.origin.y = omniboxHeaderHeight;
-      [_promoHeaderView setFrame:whatsNewFrame];
-    }
-    if (IsIPadIdiom())
-      [_searchTapTarget setHidden:!self.logoIsShowing];
-  }
-}
-
-// Initialize and add a search field tap target and a voice search button.
-- (void)addSearchField {
-  CGRect searchFieldFrame = [self searchFieldFrame];
-  _searchTapTarget.reset([[UIButton alloc] initWithFrame:searchFieldFrame]);
-  if (IsIPadIdiom()) {
-    UIImage* searchBoxImage = [[UIImage imageNamed:@"ntp_google_search_box"]
-        resizableImageWithCapInsets:kSearchBoxStretchInsets];
-    [_searchTapTarget setBackgroundImage:searchBoxImage
-                                forState:UIControlStateNormal];
-  }
-  [_searchTapTarget setAdjustsImageWhenHighlighted:NO];
-  [_searchTapTarget addTarget:self
-                       action:@selector(searchFieldTapped:)
-             forControlEvents:UIControlEventTouchUpInside];
-  [_searchTapTarget
-      setAccessibilityLabel:l10n_util::GetNSString(IDS_OMNIBOX_EMPTY_HINT)];
-  // Set isAccessibilityElement to NO so that Voice Search button is accessible.
-  [_searchTapTarget setIsAccessibilityElement:NO];
-
-  // Set up fakebox hint label.
-  CGRect hintFrame = CGRectInset([_searchTapTarget bounds], 12, 3);
-  const CGFloat kVoiceSearchOffset = 48;
-  hintFrame.size.width = searchFieldFrame.size.width - kVoiceSearchOffset;
-  base::scoped_nsobject<UILabel> searchHintLabel(
-      [[UILabel alloc] initWithFrame:hintFrame]);
-  [_searchTapTarget addSubview:searchHintLabel];
-  [searchHintLabel setTranslatesAutoresizingMaskIntoConstraints:NO];
-  [searchHintLabel
-      addConstraint:[NSLayoutConstraint
-                        constraintWithItem:searchHintLabel
-                                 attribute:NSLayoutAttributeHeight
-                                 relatedBy:NSLayoutRelationEqual
-                                    toItem:nil
-                                 attribute:NSLayoutAttributeNotAnAttribute
-                                multiplier:1
-                                  constant:hintFrame.size.height]];
-  [_searchTapTarget
-      addConstraint:[NSLayoutConstraint
-                        constraintWithItem:searchHintLabel
-                                 attribute:NSLayoutAttributeCenterY
-                                 relatedBy:NSLayoutRelationEqual
-                                    toItem:_searchTapTarget
-                                 attribute:NSLayoutAttributeCenterY
-                                multiplier:1
-                                  constant:0]];
-  _hintLabelLeadingConstraint.reset(
-      [[NSLayoutConstraint constraintWithItem:searchHintLabel
-                                    attribute:NSLayoutAttributeLeading
-                                    relatedBy:NSLayoutRelationEqual
-                                       toItem:_searchTapTarget
-                                    attribute:NSLayoutAttributeLeading
-                                   multiplier:1
-                                     constant:kHintLabelSidePadding] retain]);
-  [_searchTapTarget addConstraint:_hintLabelLeadingConstraint];
-  [searchHintLabel setText:l10n_util::GetNSString(IDS_OMNIBOX_EMPTY_HINT)];
-  if (base::i18n::IsRTL()) {
-    [searchHintLabel setTextAlignment:NSTextAlignmentRight];
-  }
-  [searchHintLabel
-      setTextColor:[UIColor
-                       colorWithWhite:kiPhoneOmniboxPlaceholderColorBrightness
-                                alpha:1.0]];
-  [searchHintLabel setFont:[MDCTypography subheadFont]];
-
-  // Add a voice search button.
-  UIImage* micImage = [UIImage imageNamed:@"voice_icon"];
-  base::scoped_nsobject<UIButton> voiceTapTarget(
-      [[UIButton alloc] initWithFrame:CGRectZero]);
-  [_searchTapTarget addSubview:voiceTapTarget];
-
-  [voiceTapTarget setTranslatesAutoresizingMaskIntoConstraints:NO];
-  [_searchTapTarget
-      addConstraint:[NSLayoutConstraint
-                        constraintWithItem:voiceTapTarget
-                                 attribute:NSLayoutAttributeCenterY
-                                 relatedBy:NSLayoutRelationEqual
-                                    toItem:_searchTapTarget
-                                 attribute:NSLayoutAttributeCenterY
-                                multiplier:1
-                                  constant:0]];
-  _voiceTapTrailingConstraint.reset(
-      [[NSLayoutConstraint constraintWithItem:voiceTapTarget
-                                    attribute:NSLayoutAttributeTrailing
-                                    relatedBy:NSLayoutRelationEqual
-                                       toItem:_searchTapTarget
-                                    attribute:NSLayoutAttributeTrailing
-                                   multiplier:1
-                                     constant:0] retain]);
-  [_searchTapTarget addConstraint:_voiceTapTrailingConstraint];
-  [voiceTapTarget
-      addConstraint:[NSLayoutConstraint
-                        constraintWithItem:voiceTapTarget
-                                 attribute:NSLayoutAttributeHeight
-                                 relatedBy:NSLayoutRelationEqual
-                                    toItem:nil
-                                 attribute:NSLayoutAttributeNotAnAttribute
-                                multiplier:0
-                                  constant:kVoiceSearchButtonWidth]];
-  [voiceTapTarget
-      addConstraint:[NSLayoutConstraint
-                        constraintWithItem:voiceTapTarget
-                                 attribute:NSLayoutAttributeWidth
-                                 relatedBy:NSLayoutRelationEqual
-                                    toItem:nil
-                                 attribute:NSLayoutAttributeNotAnAttribute
-                                multiplier:0
-                                  constant:kVoiceSearchButtonWidth]];
-  [_searchTapTarget
-      addConstraint:[NSLayoutConstraint
-                        constraintWithItem:searchHintLabel
-                                 attribute:NSLayoutAttributeTrailing
-                                 relatedBy:NSLayoutRelationEqual
-                                    toItem:voiceTapTarget
-                                 attribute:NSLayoutAttributeLeading
-                                multiplier:1
-                                  constant:0]];
-  [voiceTapTarget setAdjustsImageWhenHighlighted:NO];
-  [voiceTapTarget setImage:micImage forState:UIControlStateNormal];
-  [voiceTapTarget setTag:IDC_VOICE_SEARCH];
-  [voiceTapTarget setAccessibilityLabel:l10n_util::GetNSString(
-                                            IDS_IOS_ACCNAME_VOICE_SEARCH)];
-  [voiceTapTarget setAccessibilityIdentifier:@"Voice Search"];
-
-  if (self.voiceSearchIsEnabled) {
-    [voiceTapTarget addTarget:self
-                       action:@selector(loadVoiceSearch:)
-             forControlEvents:UIControlEventTouchUpInside];
-    [voiceTapTarget addTarget:self
-                       action:@selector(preloadVoiceSearch:)
-             forControlEvents:UIControlEventTouchDown];
-  } else {
-    [voiceTapTarget setEnabled:NO];
-  }
-}
-
-- (void)loadVoiceSearch:(id)sender {
-  DCHECK(self.voiceSearchIsEnabled);
-  base::RecordAction(UserMetricsAction("MobileNTPMostVisitedVoiceSearch"));
-  [sender chromeExecuteCommand:sender];
-}
-
-- (void)preloadVoiceSearch:(id)sender {
-  DCHECK(self.voiceSearchIsEnabled);
-  [sender removeTarget:self
-                action:@selector(preloadVoiceSearch:)
-      forControlEvents:UIControlEventTouchDown];
-
-  // Use a GenericChromeCommand because |sender| already has a tag set for a
-  // different command.
-  base::scoped_nsobject<GenericChromeCommand> command(
-      [[GenericChromeCommand alloc] initWithTag:IDC_PRELOAD_VOICE_SEARCH]);
-  [sender chromeExecuteCommand:command];
-}
-
-- (void)setFlowLayoutInset:(UICollectionViewFlowLayout*)layout {
-  CGFloat leftMargin = [self leftMargin];
-  [layout setSectionInset:UIEdgeInsetsMake(0, leftMargin, 0, leftMargin)];
-}
-
-- (void)resetSectionInset {
-  UICollectionViewFlowLayout* flowLayout =
-      (UICollectionViewFlowLayout*)[_mostVisitedView collectionViewLayout];
-  [flowLayout setSectionInset:UIEdgeInsetsZero];
-}
-
-- (void)updateSubviewFrames {
-  _mostVisitedCellSize = [self mostVisitedCellSize];
-  UICollectionViewFlowLayout* flowLayout =
-      base::mac::ObjCCastStrict<UICollectionViewFlowLayout>(
-          [_mostVisitedView collectionViewLayout]);
-  [flowLayout setItemSize:_mostVisitedCellSize];
-  self.logoVendor.view.frame = [self doodleFrame];
-
-  [self setFlowLayoutInset:flowLayout];
-  [flowLayout invalidateLayout];
-  [_promoHeaderView setSideMargin:[self leftMargin]];
-
-  // On the iPhone 6 Plus, if the app is started in landscape after a fresh
-  // install, the UICollectionViewLayout incorrectly sizes the widths of the
-  // supplementary views to the portrait width.  Correct that here to ensure
-  // that the header is property laid out to the UICollectionView's width.
-  // crbug.com/491131
-  CGFloat collectionViewWidth = CGRectGetWidth([_mostVisitedView bounds]);
-  CGFloat collectionViewMinX = CGRectGetMinX([_mostVisitedView bounds]);
-  for (UIView* supplementaryView in _supplementaryViews.get()) {
-    CGRect supplementaryViewFrame = supplementaryView.frame;
-    supplementaryViewFrame.origin.x = collectionViewMinX;
-    supplementaryViewFrame.size.width = collectionViewWidth;
-    supplementaryView.frame = supplementaryViewFrame;
-  }
-
-  BOOL isScrollableNTP = !IsIPadIdiom() || IsCompactTablet();
-  if (isScrollableNTP && _scrolledToTop) {
-    // Set the scroll view's offset to the pinned offset to keep the omnibox
-    // at the top of the screen if it isn't already.
-    CGFloat pinnedOffsetY = [self pinnedOffsetY];
-    if ([_mostVisitedView contentOffset].y < pinnedOffsetY) {
-      [_mostVisitedView setContentOffset:CGPointMake(0, pinnedOffsetY)];
-    } else {
-      [self updateSearchField];
-    }
-  } else {
-    [_searchTapTarget setFrame:[self searchFieldFrame]];
-  }
-
-  if (!_viewLoaded) {
-    _viewLoaded = YES;
-    [self.logoVendor fetchDoodle];
-  }
-  [self.delegate updateNtpBarShadowForPanelController:self];
-}
-
-// Initialize and add a panel with most visited sites.
-- (void)addMostVisited {
-  CGRect mostVisitedFrame = [self.view bounds];
-  base::scoped_nsobject<UICollectionViewFlowLayout> flowLayout;
-  if (IsIPadIdiom())
-    flowLayout.reset([[UICollectionViewFlowLayout alloc] init]);
-  else
-    flowLayout.reset([[MostVisitedLayout alloc] init]);
-
-  [flowLayout setScrollDirection:UICollectionViewScrollDirectionVertical];
-  [flowLayout setItemSize:_mostVisitedCellSize];
-  [flowLayout setMinimumInteritemSpacing:8];
-  [flowLayout setMinimumLineSpacing:[self mostVisitedCellPadding]];
-  DCHECK(!_mostVisitedView);
-  _mostVisitedView.reset([[UICollectionView alloc]
-             initWithFrame:mostVisitedFrame
-      collectionViewLayout:flowLayout]);
-  [_mostVisitedView setAutoresizingMask:UIViewAutoresizingFlexibleHeight |
-                                        UIViewAutoresizingFlexibleWidth];
-  [_mostVisitedView setDelegate:self];
-  [_mostVisitedView setDataSource:self];
-  [_mostVisitedView registerClass:[MostVisitedCell class]
-       forCellWithReuseIdentifier:@"classCell"];
-  [_mostVisitedView setBackgroundColor:[UIColor clearColor]];
-  [_mostVisitedView setBounces:YES];
-  [_mostVisitedView setShowsHorizontalScrollIndicator:NO];
-  [_mostVisitedView setShowsVerticalScrollIndicator:NO];
-  [_mostVisitedView registerClass:[WhatsNewHeaderView class]
-       forSupplementaryViewOfKind:UICollectionElementKindSectionHeader
-              withReuseIdentifier:@"whatsNew"];
-  [_mostVisitedView registerClass:[NewTabPageHeaderView class]
-       forSupplementaryViewOfKind:UICollectionElementKindSectionHeader
-              withReuseIdentifier:@"header"];
-  [_mostVisitedView setAccessibilityIdentifier:@"Google Landing"];
-
-  [self.view addSubview:_mostVisitedView];
-}
-
-- (void)updateSearchField {
-  NSArray* constraints =
-      @[ _hintLabelLeadingConstraint, _voiceTapTrailingConstraint ];
-  [_headerView updateSearchField:_searchTapTarget
-                withInitialFrame:[self searchFieldFrame]
-              subviewConstraints:constraints
-                       forOffset:[_mostVisitedView contentOffset].y];
-}
-
-- (void)addOverscrollActions {
-  if (!IsIPadIdiom()) {
-    _overscrollActionsController.reset([[OverscrollActionsController alloc]
-        initWithScrollView:_mostVisitedView]);
-    [_overscrollActionsController setStyle:OverscrollStyle::NTP_NON_INCOGNITO];
-    [_overscrollActionsController setDelegate:self];
-  }
-}
-
-// Check to see if the promo label should be hidden.
-- (void)hideWhatsNewIfNecessary {
-  if (![_promoHeaderView isHidden] && !self.promoCanShow) {
-    [_promoHeaderView setHidden:YES];
-    [self.view setNeedsLayout];
-  }
-}
-
-- (void)locationBarBecomesFirstResponder {
-  if (!_isShowing)
-    return;
-
-  _omniboxFocused = YES;
-  [self shiftTilesUp];
-}
-
-- (void)shiftTilesUp {
-  _scrolledToTop = YES;
-  // Add gesture recognizer to background |self.view| when omnibox is focused.
-  [self.view addGestureRecognizer:_tapGestureRecognizer];
-  [self.view addGestureRecognizer:_swipeGestureRecognizer];
-
-  CGFloat pinnedOffsetY = [self pinnedOffsetY];
-  _animateHeader = !IsIPadIdiom();
-
-  [UIView animateWithDuration:0.25
-      animations:^{
-        if ([_mostVisitedView contentOffset].y < pinnedOffsetY) {
-          [_mostVisitedView setContentOffset:CGPointMake(0, pinnedOffsetY)];
-          [[_mostVisitedView collectionViewLayout] invalidateLayout];
-        }
-      }
-      completion:^(BOOL finished) {
-        // Check to see if we are still scrolled to the top -- it's possible
-        // (and difficult) to resign the first responder and initiate a
-        // -shiftTilesDown before the animation here completes.
-        if (_scrolledToTop) {
-          _animateHeader = NO;
-          if (!IsIPadIdiom()) {
-            [self.dispatcher onFakeboxAnimationComplete];
-            [_headerView fadeOutShadow];
-            [_searchTapTarget setHidden:YES];
-          }
-        }
-      }];
-}
-
-- (void)searchFieldTapped:(id)sender {
-  [self.dispatcher focusFakebox];
-}
-
-- (void)blurOmnibox {
-  if (_omniboxFocused) {
-    [self.dispatcher cancelOmniboxEdit];
-  } else {
-    [self locationBarResignsFirstResponder];
-  }
-}
-
-- (void)locationBarResignsFirstResponder {
-  if (!_isShowing && !_scrolledToTop)
-    return;
-
-  _omniboxFocused = NO;
-  if ([_contextMenuCoordinator isVisible]) {
-    return;
-  }
-
-  [self shiftTilesDown];
-}
-
-- (void)shiftTilesDown {
-  _animateHeader = YES;
-  _scrolledToTop = NO;
-  if (!IsIPadIdiom()) {
-    [_searchTapTarget setHidden:NO];
-    [self.dispatcher onFakeboxBlur];
-  }
-
-  // Reload most visited sites in case the number of placeholder cells needs to
-  // be updated after an orientation change.
-  [_mostVisitedView reloadData];
-
-  // Reshow views that are within range of the most visited collection view
-  // (if necessary).
-  [self.view removeGestureRecognizer:_tapGestureRecognizer];
-  [self.view removeGestureRecognizer:_swipeGestureRecognizer];
-
-  // CADisplayLink is used for this animation instead of the standard UIView
-  // animation because the standard animation did not properly convert the
-  // fakebox from its scrolled up mode to its scrolled down mode. Specifically,
-  // calling |UICollectionView reloadData| adjacent to the standard animation
-  // caused the fakebox's views to jump incorrectly. CADisplayLink avoids this
-  // problem because it allows |shiftTilesDownAnimationDidFire| to directly
-  // control each frame.
-  CADisplayLink* link = [CADisplayLink
-      displayLinkWithTarget:self
-                   selector:@selector(shiftTilesDownAnimationDidFire:)];
-  [link addToRunLoop:[NSRunLoop mainRunLoop] forMode:NSDefaultRunLoopMode];
-
-  // Dismisses modal UI elements if displayed. Must be called at the end of
-  // -locationBarResignsFirstResponder since it could result in -dealloc being
-  // called.
-  [self dismissModals];
-}
-
-- (void)shiftTilesDownAnimationDidFire:(CADisplayLink*)link {
-  // If this is the first frame of the animation, store the starting timestamp
-  // and do nothing.
-  if (_shiftTilesDownStartTime == -1) {
-    _shiftTilesDownStartTime = link.timestamp;
-    return;
-  }
-
-  CFTimeInterval timeElapsed = link.timestamp - _shiftTilesDownStartTime;
-  double percentComplete = timeElapsed / kShiftTilesDownAnimationDuration;
-  // Ensure that the percentage cannot be above 1.0.
-  if (percentComplete > 1.0)
-    percentComplete = 1.0;
-
-  // Find how much the collection view should be scrolled up in the next frame.
-  CGFloat yOffset = (1.0 - percentComplete) * [self pinnedOffsetY];
-  [_mostVisitedView setContentOffset:CGPointMake(0, yOffset)];
-
-  if (percentComplete == 1.0) {
-    [link invalidate];
-    // Reset |shiftTilesDownStartTime to its sentinal value.
-    _shiftTilesDownStartTime = -1;
-    [[_mostVisitedView collectionViewLayout] invalidateLayout];
-  }
-}
-
-- (void)reloadData {
-  // -reloadData updates from |self.mostVisitedData|.
-  // -invalidateLayout is necessary because sometimes the flowLayout has the
-  // wrong cached size and will throw an internal exception if the
-  // -numberOfItems shrinks. -setNeedsLayout is needed in case
-  // -numberOfItems increases enough to add a new row and change the height
-  // of _mostVisitedView.
-  [_mostVisitedView reloadData];
-  [[_mostVisitedView collectionViewLayout] invalidateLayout];
-  [self.view setNeedsLayout];
-}
-
-- (CGFloat)heightForSectionWithOmnibox {
-  CGFloat headerHeight =
-      CGRectGetMaxY([self searchFieldFrame]) + kNTPSearchFieldBottomPadding;
-  if (IsIPadIdiom()) {
-    if (self.logoIsShowing) {
-      if (!self.promoCanShow) {
-        UIInterfaceOrientation orient =
-            [[UIApplication sharedApplication] statusBarOrientation];
-        const CGFloat kTopSpacingMaterialPortrait = 56;
-        const CGFloat kTopSpacingMaterialLandscape = 32;
-        headerHeight += UIInterfaceOrientationIsPortrait(orient)
-                            ? kTopSpacingMaterialPortrait
-                            : kTopSpacingMaterialLandscape;
-      }
-    } else {
-      headerHeight = kNonGoogleSearchHeaderHeightIPad;
-    }
-  }
-  return headerHeight;
-}
-
-#pragma mark - ToolbarOwner
-
-- (ToolbarController*)relinquishedToolbarController {
-  return [_headerView relinquishedToolbarController];
-}
-
-- (void)reparentToolbarController {
-  [_headerView reparentToolbarController];
-}
-
-#pragma mark - UICollectionView Methods.
-
-- (CGSize)collectionView:(UICollectionView*)collectionView
-                             layout:
-                                 (UICollectionViewLayout*)collectionViewLayout
-    referenceSizeForHeaderInSection:(NSInteger)section {
-  CGFloat headerHeight = 0;
-  if (section == SectionWithOmnibox) {
-    headerHeight = [self heightForSectionWithOmnibox];
-    ((UICollectionViewFlowLayout*)collectionViewLayout).headerReferenceSize =
-        CGSizeMake(0, headerHeight);
-  } else if (section == SectionWithMostVisited) {
-    if (self.promoCanShow) {
-      headerHeight = [self promoHeaderHeight];
-    } else {
-      headerHeight = kWhatsNewHeaderHiddenHeight;
-    }
-  }
-  return CGSizeMake(0, headerHeight);
-}
-
-#pragma mark - UICollectionViewDelegate
-
-- (BOOL)collectionView:(UICollectionView*)collectionView
-    shouldSelectItemAtIndexPath:(NSIndexPath*)indexPath {
-  return indexPath.row < static_cast<NSInteger>([self numberOfItems]);
-}
-
-- (void)collectionView:(UICollectionView*)collectionView
-    didSelectItemAtIndexPath:(NSIndexPath*)indexPath {
-  MostVisitedCell* cell =
-      (MostVisitedCell*)[collectionView cellForItemAtIndexPath:indexPath];
-
-  // Keep the UICollectionView alive for one second while the screen
-  // reader does its thing.
-  // TODO(jif): This needs a radar, since it is almost certainly a
-  // UIKit accessibility bug. crbug.com/529271
-  if (UIAccessibilityIsVoiceOverRunning()) {
-    UICollectionView* blockView = [_mostVisitedView retain];
-    dispatch_after(dispatch_time(DISPATCH_TIME_NOW,
-                                 static_cast<int64_t>(1 * NSEC_PER_SEC)),
-                   dispatch_get_main_queue(), ^{
-                     [blockView release];
-                   });
-  }
-
-  const NSUInteger visitedIndex = indexPath.row;
-  [self blurOmnibox];
-  DCHECK(visitedIndex < [self numberOfItems]);
-  [self.dataSource logMostVisitedClick:visitedIndex tileType:cell.tileType];
-  [self.dispatcher loadURL:[self urlForIndex:visitedIndex]
-                  referrer:web::Referrer()
-                transition:ui::PAGE_TRANSITION_AUTO_BOOKMARK
-         rendererInitiated:NO];
-}
-
-#pragma mark - UICollectionViewDataSource
-
-- (UICollectionReusableView*)collectionView:(UICollectionView*)collectionView
-          viewForSupplementaryElementOfKind:(NSString*)kind
-                                atIndexPath:(NSIndexPath*)indexPath {
-  DCHECK(kind == UICollectionElementKindSectionHeader);
-
-  if (!_supplementaryViews)
-    _supplementaryViews.reset([[NSMutableArray alloc] init]);
-
-  if (indexPath.section == SectionWithOmnibox) {
-    if (!_headerView) {
-      _headerView.reset([[collectionView
-          dequeueReusableSupplementaryViewOfKind:
-              UICollectionElementKindSectionHeader
-                             withReuseIdentifier:@"header"
-                                    forIndexPath:indexPath] retain]);
-      [_headerView addSubview:[self.logoVendor view]];
-      [_headerView addSubview:_searchTapTarget];
-      [_headerView addViewsToSearchField:_searchTapTarget];
-
-      if (!IsIPadIdiom()) {
-        // iPhone header also contains a toolbar since the normal toolbar is
-        // hidden.
-        [_headerView addToolbarWithDataSource:self.dataSource
-                                   dispatcher:self.dispatcher];
-        [_headerView setToolbarTabCount:self.tabCount];
-        [_headerView setCanGoForward:self.canGoForward];
-        [_headerView setCanGoBack:self.canGoBack];
-      }
-      [_supplementaryViews addObject:_headerView];
-    }
-    return _headerView;
-  }
-
-  if (indexPath.section == SectionWithMostVisited) {
-    if (!_promoHeaderView) {
-      _promoHeaderView.reset([[collectionView
-          dequeueReusableSupplementaryViewOfKind:
-              UICollectionElementKindSectionHeader
-                             withReuseIdentifier:@"whatsNew"
-                                    forIndexPath:indexPath] retain]);
-      [_promoHeaderView setSideMargin:[self leftMargin]];
-      [_promoHeaderView setDelegate:self];
-      if (self.promoCanShow) {
-        [_promoHeaderView setText:self.promoText];
-        [_promoHeaderView setIcon:self.promoIcon];
-        [self.dataSource promoViewed];
-      }
-      [_supplementaryViews addObject:_promoHeaderView];
-    }
-    return _promoHeaderView;
-  }
-
-  NOTREACHED();
-  return nil;
-}
-
-- (NSInteger)numberOfSectionsInCollectionView:
-    (UICollectionView*)collectionView {
-  return NumberOfCollectionViewSections;
-}
-
-- (NSInteger)collectionView:(UICollectionView*)collectionView
-     numberOfItemsInSection:(NSInteger)section {
-  // The first section only contains a header view and no items.
-  if (section == SectionWithOmnibox)
-    return 0;
-
-  // Phone always contains the maximum number of cells. Cells in excess of the
-  // number of thumbnails are used solely for layout/sizing.
-  if (!IsIPadIdiom())
-    return self.maximumMostVisitedSitesShown;
-
-  return [self numberOfNonEmptyTilesShown];
-}
-
-- (UICollectionViewCell*)collectionView:(UICollectionView*)collectionView
-                 cellForItemAtIndexPath:(NSIndexPath*)indexPath {
-  MostVisitedCell* cell = (MostVisitedCell*)[collectionView
-      dequeueReusableCellWithReuseIdentifier:@"classCell"
-                                forIndexPath:indexPath];
-  BOOL isPlaceholder = indexPath.row >= (int)[self numberOfItems];
-  if (isPlaceholder) {
-    [cell showPlaceholder];
-    for (UIGestureRecognizer* ges in cell.gestureRecognizers) {
-      [cell removeGestureRecognizer:ges];
-    }
-
-    // When -numberOfItems is 0, always remove the placeholder.
-    if (indexPath.row >= [self numberOfColumns] || [self numberOfItems] == 0) {
-      // This cell is completely empty and only exists for layout/sizing
-      // purposes.
-      [cell removePlaceholderImage];
-    }
-    return cell;
-  }
-
-  const ntp_tiles::NTPTile& ntpTile =
-      [self.dataSource mostVisitedAtIndex:indexPath.row];
-  NSString* title = base::SysUTF16ToNSString(ntpTile.title);
-
-  [cell setupWithURL:ntpTile.url title:title dataSource:self.dataSource];
-
-  base::scoped_nsobject<UILongPressGestureRecognizer> longPress(
-      [[UILongPressGestureRecognizer alloc]
-          initWithTarget:self
-                  action:@selector(handleMostVisitedLongPress:)]);
-  [cell addGestureRecognizer:longPress];
-
-  return cell;
-}
-
-#pragma mark - Context Menu
-
-// Called when a user does a long press on a most visited item.
-- (void)handleMostVisitedLongPress:(UILongPressGestureRecognizer*)sender {
-  if (sender.state == UIGestureRecognizerStateBegan) {
-    // Only one long press at a time.
-    if ([_contextMenuCoordinator isVisible]) {
-      return;
-    }
-
-    NSIndexPath* indexPath = [_mostVisitedView
-        indexPathForCell:static_cast<UICollectionViewCell*>(sender.view)];
-    const NSUInteger index = indexPath.row;
-
-    // A long press occured on one of the most visited button. Popup a context
-    // menu.
-    DCHECK(index < [self numberOfItems]);
-
-    web::ContextMenuParams params;
-    // Get view coordinates in local space.
-    params.location = [sender locationInView:self.view];
-    params.view.reset([self.view retain]);
-
-    // Present sheet/popover using controller that is added to view hierarchy.
-    UIViewController* topController = [params.view window].rootViewController;
-    while (topController.presentedViewController)
-      topController = topController.presentedViewController;
-
-    _contextMenuCoordinator.reset([[ContextMenuCoordinator alloc]
-        initWithBaseViewController:topController
-                            params:params]);
-
-    ProceduralBlock action;
-
-    // Open In New Tab.
-    GURL url = [self urlForIndex:index];
-    base::WeakNSObject<GoogleLandingController> weakSelf(self);
-    action = ^{
-      base::scoped_nsobject<GoogleLandingController> strongSelf(
-          [weakSelf retain]);
-      if (!strongSelf)
-        return;
-      MostVisitedCell* cell = (MostVisitedCell*)sender.view;
-      [[strongSelf dataSource] logMostVisitedClick:index
-                                          tileType:cell.tileType];
-      [[strongSelf dispatcher] webPageOrderedOpen:url
-                                         referrer:web::Referrer()
-                                     inBackground:YES
-                                         appendTo:kCurrentTab];
-    };
-    [_contextMenuCoordinator
-        addItemWithTitle:l10n_util::GetNSStringWithFixup(
-                             IDS_IOS_CONTENT_CONTEXT_OPENLINKNEWTAB)
-                  action:action];
-
-    if (!self.isOffTheRecord) {
-      // Open in Incognito Tab.
-      action = ^{
-        base::scoped_nsobject<GoogleLandingController> strongSelf(
-            [weakSelf retain]);
-        if (!strongSelf)
-          return;
-        MostVisitedCell* cell = (MostVisitedCell*)sender.view;
-        [[strongSelf dataSource] logMostVisitedClick:index
-                                            tileType:cell.tileType];
-        [[strongSelf dispatcher] webPageOrderedOpen:url
-                                           referrer:web::Referrer()
-                                        inIncognito:YES
-                                       inBackground:NO
-                                           appendTo:kCurrentTab];
-      };
-      [_contextMenuCoordinator
-          addItemWithTitle:l10n_util::GetNSStringWithFixup(
-                               IDS_IOS_CONTENT_CONTEXT_OPENLINKNEWINCOGNITOTAB)
-                    action:action];
-    }
-
-    // Remove the most visited url.
-    NSString* title =
-        l10n_util::GetNSStringWithFixup(IDS_BOOKMARK_BUBBLE_REMOVE_BOOKMARK);
-    action = ^{
-      base::scoped_nsobject<GoogleLandingController> strongSelf(
-          [weakSelf retain]);
-      // Early return if the controller has been deallocated.
-      if (!strongSelf)
-        return;
-      base::RecordAction(UserMetricsAction("MostVisited_UrlBlacklisted"));
-      [[strongSelf dataSource] addBlacklistedURL:url];
-      [strongSelf showMostVisitedUndoForURL:net::NSURLWithGURL(url)];
-    };
-    [_contextMenuCoordinator addItemWithTitle:title action:action];
-
-    [_contextMenuCoordinator start];
-
-    if (IsIPadIdiom())
-      [self blurOmnibox];
-  }
-}
-
-- (void)showMostVisitedUndoForURL:(NSURL*)url {
-  _deletedUrl.reset([url retain]);
-
-  MDCSnackbarMessageAction* action =
-      [[[MDCSnackbarMessageAction alloc] init] autorelease];
-  base::WeakNSObject<GoogleLandingController> weakSelf(self);
-  action.handler = ^{
-    base::scoped_nsobject<GoogleLandingController> strongSelf(
-        [weakSelf retain]);
-    if (!strongSelf)
-      return;
-    [[strongSelf dataSource]
-        removeBlacklistedURL:net::GURLWithNSURL(_deletedUrl)];
-  };
-  action.title = l10n_util::GetNSString(IDS_NEW_TAB_UNDO_THUMBNAIL_REMOVE);
-  action.accessibilityIdentifier = @"Undo";
-
-  TriggerHapticFeedbackForNotification(UINotificationFeedbackTypeSuccess);
-  MDCSnackbarMessage* message = [MDCSnackbarMessage
-      messageWithText:l10n_util::GetNSString(
-                          IDS_IOS_NEW_TAB_MOST_VISITED_ITEM_REMOVED)];
-  message.action = action;
-  message.category = @"MostVisitedUndo";
-  [MDCSnackbarManager showMessage:message];
-}
-
-- (void)onPromoLabelTapped {
-  [self.dispatcher cancelOmniboxEdit];
-  [_promoHeaderView setHidden:YES];
-  [self.view setNeedsLayout];
-  [self.dataSource promoTapped];
-}
-
-// Returns the Y value to use for the scroll view's contentOffset when scrolling
-// the omnibox to the top of the screen.
-- (CGFloat)pinnedOffsetY {
-  CGFloat headerHeight = [_headerView frame].size.height;
-  CGFloat offsetY =
-      headerHeight - ntp_header::kScrolledToTopOmniboxBottomMargin;
-  if (!IsIPadIdiom())
-    offsetY -= ntp_header::kToolbarHeight;
-
-  return offsetY;
-}
-
-#pragma mark - NewTabPagePanelProtocol
-
-- (void)reload {
-  // Fetch the doodle after the view finishes laying out. Otherwise, tablet
-  // may fetch the wrong sized doodle.
-  if (_viewLoaded)
-    [self.logoVendor fetchDoodle];
-  [self updateLogoAndFakeboxDisplay];
-  [self hideWhatsNewIfNecessary];
-}
-
-- (void)wasShown {
-  _isShowing = YES;
-  [_headerView hideToolbarViewsForNewTabPage];
-}
-
-- (void)wasHidden {
-  _isShowing = NO;
-}
-
-- (void)dismissModals {
-  [_contextMenuCoordinator stop];
-}
-
-- (void)dismissKeyboard {
-}
-
-- (void)setScrollsToTop:(BOOL)enable {
-}
-
-- (CGFloat)alphaForBottomShadow {
-  // Get the frame of the bottommost cell in |self.view|'s coordinate system.
-  NSInteger section = SectionWithMostVisited;
-  // Account for the fact that the tableview may not yet contain
-  // |numberOfNonEmptyTilesShown| tiles because it hasn't been updated yet.
-  NSUInteger lastItemIndex =
-      std::min([_mostVisitedView numberOfItemsInSection:SectionWithMostVisited],
-               [self numberOfNonEmptyTilesShown]) -
-      1;
-  DCHECK(lastItemIndex >= 0);
-  NSIndexPath* lastCellIndexPath =
-      [NSIndexPath indexPathForItem:lastItemIndex inSection:section];
-  UICollectionViewLayoutAttributes* attributes =
-      [_mostVisitedView layoutAttributesForItemAtIndexPath:lastCellIndexPath];
-  CGRect lastCellFrame = attributes.frame;
-  CGRect cellFrameInSuperview =
-      [_mostVisitedView convertRect:lastCellFrame toView:self.view];
-
-  // Calculate when the bottom of the cell passes through the bottom of
-  // |self.view|.
-  CGFloat maxY = CGRectGetMaxY(cellFrameInSuperview);
-  CGFloat viewHeight = CGRectGetHeight(self.view.frame);
-
-  CGFloat pixelsBelowFrame = maxY - viewHeight;
-  CGFloat alpha = pixelsBelowFrame / kNewTabPageDistanceToFadeShadow;
-  alpha = MIN(MAX(alpha, 0), 1);
-  return alpha;
-}
-
-- (void)willUpdateSnapshot {
-  [_overscrollActionsController clear];
-}
-
-#pragma mark - LogoAnimationControllerOwnerOwner
-
-- (id<LogoAnimationControllerOwner>)logoAnimationControllerOwner {
-  return [self.logoVendor logoAnimationControllerOwner];
-}
-
-#pragma mark - UIScrollViewDelegate Methods.
-
-- (void)scrollViewDidScroll:(UIScrollView*)scrollView {
-  [self.delegate updateNtpBarShadowForPanelController:self];
-  [_overscrollActionsController scrollViewDidScroll:scrollView];
-
-  // Blur the omnibox when the scroll view is scrolled below the pinned offset.
-  CGFloat pinnedOffsetY = [self pinnedOffsetY];
-  if (_omniboxFocused && scrollView.dragging &&
-      scrollView.contentOffset.y < pinnedOffsetY) {
-    [self.dispatcher cancelOmniboxEdit];
-  }
-
-  if (IsIPadIdiom()) {
-    return;
-  }
-
-  if (_animateHeader) {
-    [self updateSearchField];
-  }
-}
-
-- (void)scrollViewWillBeginDragging:(UIScrollView*)scrollView {
-  [_overscrollActionsController scrollViewWillBeginDragging:scrollView];
-}
-
-- (void)scrollViewDidEndDragging:(UIScrollView*)scrollView
-                  willDecelerate:(BOOL)decelerate {
-  [_overscrollActionsController scrollViewDidEndDragging:scrollView
-                                          willDecelerate:decelerate];
-}
-
-- (void)scrollViewWillEndDragging:(UIScrollView*)scrollView
-                     withVelocity:(CGPoint)velocity
-              targetContentOffset:(inout CGPoint*)targetContentOffset {
-  [_overscrollActionsController scrollViewWillEndDragging:scrollView
-                                             withVelocity:velocity
-                                      targetContentOffset:targetContentOffset];
-
-  if (IsIPadIdiom() || _omniboxFocused)
-    return;
-
-  CGFloat pinnedOffsetY = [self pinnedOffsetY];
-  CGFloat offsetY = scrollView.contentOffset.y;
-  CGFloat targetY = targetContentOffset->y;
-  if (offsetY > 0 && offsetY < pinnedOffsetY) {
-    // Omnibox is currently between middle and top of screen.
-    if (velocity.y > 0) {  // scrolling upwards
-      if (targetY < pinnedOffsetY) {
-        // Scroll the omnibox up to |pinnedOffsetY| if velocity is upwards but
-        // scrolling will stop before reaching |pinnedOffsetY|.
-        targetContentOffset->y = offsetY;
-        [_mostVisitedView setContentOffset:CGPointMake(0, pinnedOffsetY)
-                                  animated:YES];
-      }
-      _scrolledToTop = YES;
-    } else {  // scrolling downwards
-      if (targetY > 0) {
-        // Scroll the omnibox down to zero if velocity is downwards or 0 but
-        // scrolling will stop before reaching 0.
-        targetContentOffset->y = offsetY;
-        [_mostVisitedView setContentOffset:CGPointZero animated:YES];
-      }
-      _scrolledToTop = NO;
-    }
-  } else if (offsetY > pinnedOffsetY &&
-             targetContentOffset->y < pinnedOffsetY) {
-    // Most visited cells are currently scrolled up past the omnibox but will
-    // end the scroll below the omnibox. Stop the scroll at just below the
-    // omnibox.
-    targetContentOffset->y = offsetY;
-    [_mostVisitedView setContentOffset:CGPointMake(0, pinnedOffsetY)
-                              animated:YES];
-    _scrolledToTop = YES;
-  } else if (offsetY >= pinnedOffsetY) {
-    _scrolledToTop = YES;
-  } else if (offsetY <= 0) {
-    _scrolledToTop = NO;
-  }
-}
-
-#pragma mark - Most visited / Suggestions service wrapper methods.
-
-- (NSUInteger)numberOfItems {
-  NSUInteger numItems = [self.dataSource mostVisitedSize];
-  NSUInteger maxItems = [self numberOfColumns] * kMaxNumMostVisitedFaviconRows;
-  return MIN(maxItems, numItems);
-}
-
-- (NSInteger)numberOfNonEmptyTilesShown {
-  NSInteger numCells =
-      MIN([self numberOfItems], self.maximumMostVisitedSitesShown);
-  return MAX(numCells, [self numberOfColumns]);
-}
-
-- (GURL)urlForIndex:(NSUInteger)index {
-  return [self.dataSource mostVisitedAtIndex:index].url;
-}
-
-#pragma mark - GoogleLandingController (ExposedForTesting) methods.
-
-- (BOOL)scrolledToTop {
-  return _scrolledToTop;
-}
-
-- (BOOL)animateHeader {
-  return _animateHeader;
-}
-
-#pragma mark - OverscrollActionsControllerDelegate
-
-- (void)overscrollActionsController:(OverscrollActionsController*)controller
-                   didTriggerAction:(OverscrollAction)action {
-  switch (action) {
-    case OverscrollAction::NEW_TAB: {
-      base::scoped_nsobject<GenericChromeCommand> command(
-          [[GenericChromeCommand alloc] initWithTag:IDC_NEW_TAB]);
-      [[self view] chromeExecuteCommand:command];
-    } break;
-    case OverscrollAction::CLOSE_TAB: {
-      base::scoped_nsobject<GenericChromeCommand> command(
-          [[GenericChromeCommand alloc] initWithTag:IDC_CLOSE_TAB]);
-      [[self view] chromeExecuteCommand:command];
-    } break;
-    case OverscrollAction::REFRESH:
-      [self reload];
-      break;
-    case OverscrollAction::NONE:
-      NOTREACHED();
-      break;
-  }
-}
-
-- (BOOL)shouldAllowOverscrollActions {
-  return YES;
-}
-
-- (UIView*)toolbarSnapshotView {
-  return [[_headerView toolBarView] snapshotViewAfterScreenUpdates:NO];
-}
-
-- (UIView*)headerView {
-  return self.view;
-}
-
-- (CGFloat)overscrollActionsControllerHeaderInset:
-    (OverscrollActionsController*)controller {
-  return 0;
-}
-
-- (CGFloat)overscrollHeaderHeight {
-  return [_headerView toolBarView].bounds.size.height;
-}
-
-#pragma mark - UIGestureRecognizerDelegate
-
-- (BOOL)gestureRecognizer:(UIGestureRecognizer*)gestureRecognizer
-       shouldReceiveTouch:(UITouch*)touch {
-  return [self nearestAncestorOfView:touch.view
-                           withClass:[MostVisitedCell class]] == nil;
-}
-
-- (UIView*)nearestAncestorOfView:(UIView*)view withClass:(Class)aClass {
-  if (!view) {
-    return nil;
-  }
-  if ([view isKindOfClass:aClass]) {
-    return view;
-  }
-  return [self nearestAncestorOfView:[view superview] withClass:aClass];
-}
-
-#pragma mark - GoogleLandingConsumer
-
-- (void)setLogoIsShowing:(BOOL)logoIsShowing {
-  _logoIsShowing = logoIsShowing;
-  [self updateLogoAndFakeboxDisplay];
-}
-
-- (void)mostVisitedDataUpdated {
-  [self reloadData];
-}
-
-- (void)mostVisitedIconMadeAvailableAtIndex:(NSUInteger)index {
-  if (index >= [self numberOfItems])
-    return;
-
-  NSIndexPath* indexPath =
-      [NSIndexPath indexPathForRow:index inSection:SectionWithMostVisited];
-  [_mostVisitedView reloadItemsAtIndexPaths:@[ indexPath ]];
-}
-
-- (void)setTabCount:(int)tabCount {
-  _tabCount = tabCount;
-  [_headerView setToolbarTabCount:self.tabCount];
-}
-
-- (void)setCanGoForward:(BOOL)canGoForward {
-  _canGoForward = canGoForward;
-  [_headerView setCanGoForward:self.canGoForward];
-}
-
-- (void)setCanGoBack:(BOOL)canGoBack {
-  _canGoBack = canGoBack;
-  [_headerView setCanGoBack:self.canGoBack];
-}
-@end