[ios clean] Add placeholder for NTP bookmarks, chrome home and open tabs.

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

Index: ios/chrome/browser/ui/ntp/new_tab_page_view.mm
diff --git a/ios/chrome/browser/ui/ntp/new_tab_page_view.mm b/ios/chrome/browser/ui/ntp/new_tab_page_view.mm
index 7f9f7ab87e63cfe169c902b229e1c613ae416218..52790970460013eda28bab97a55cbe4cc6c6ee45 100644
--- a/ios/chrome/browser/ui/ntp/new_tab_page_view.mm
+++ b/ios/chrome/browser/ui/ntp/new_tab_page_view.mm
@@ -80,11 +80,15 @@
     [self.scrollView setContentOffset:point animated:NO];
   }
 
-  // Trigger a layout.  The |-layoutIfNeeded| call is required because sometimes
-  // |-layoutSubviews| is not successfully triggered when |-setNeedsLayout| is
-  // called after frame changes due to autoresizing masks.
-  [self setNeedsLayout];
-  [self layoutIfNeeded];
+  // This should never be needed in autolayout.
+  if (self.translatesAutoresizingMaskIntoConstraints) {
+    // Trigger a layout.  The |-layoutIfNeeded| call is required because
+    // sometimes
+    // |-layoutSubviews| is not successfully triggered when |-setNeedsLayout| is

[lpromero, 2017/04/06 13:01:04]

Reflow the comment.

[justincohen, 2017/04/06 18:25:09]

Done.

+    // called after frame changes due to autoresizing masks.
+    [self setNeedsLayout];
+    [self layoutIfNeeded];
+  }
 }
 
 - (void)layoutSubviews {
@@ -102,6 +106,14 @@
         CGRectGetMinX(self.bounds), CGRectGetMinY(self.bounds),
         CGRectGetWidth(self.bounds), CGRectGetMinY(self.tabBar.frame));
   }
+
+  // When using a new_tab_page_view in autolayout -setFrame is never called,
+  // which means all the logic to keep the selected scroll index set is never
+  // called.  Rather than refactor away all of this to support ios/clean, just
+  // make sure -setFrame is called when loaded in autolayout.
+  if (!self.translatesAutoresizingMaskIntoConstraints) {
+    [self setFrame:self.frame];
+  }
 }
 
 - (void)updateScrollViewContentSize {