Fix RTL layout for Collection Cells

Summary:
Properly handle RTL in collection cells with accessory views.

AUTHOR:ed-chin

Test Plan: Tested on pseudortl on iOS 9 simulator

Reviewers: O1 Material components iOS, cjcox

Reviewed By: O1 Material components iOS, cjcox

Tags: #material_components_ios

Differential Revision: http://codereview.cc/D1449

components/CollectionCells/src/MDCCollectionViewCell.m

@@ -188,6 +188,12 @@ - (void)layoutForegroundSubviews {
   _accessoryView.frame = [self accessoryFrame];
   // Then lay out the content view, inset by the accessory view's width.
   self.contentView.frame = [self contentViewFrame];
+
+  // If necessary flip subviews for RTL.
+  _accessoryView.frame = MDCRectFlippedForRTL(_accessoryView.frame, CGRectGetWidth(self.bounds),
+                                              self.mdc_effectiveUserInterfaceLayoutDirection);
+  self.contentView.frame = MDCRectFlippedForRTL(self.contentView.frame, CGRectGetWidth(self.bounds),
+                                                self.mdc_effectiveUserInterfaceLayoutDirection);
 }
 
 #pragma mark - Accessory Views
@@ -247,9 +253,7 @@ - (CGRect)accessoryFrame {
   CGSize size = _accessoryView.frame.size;
   CGFloat originX = CGRectGetWidth(self.bounds) - size.width - _accessoryInset.right;
   CGFloat originY = (CGRectGetHeight(self.bounds) - size.height) / 2;
-  CGRect frame = CGRectMake(originX, originY, size.width, size.height);
-  return MDCRectFlippedForRTL(frame, CGRectGetWidth(self.bounds),
-                              self.mdc_effectiveUserInterfaceLayoutDirection);
+  return CGRectMake(originX, originY, size.width, size.height);
 }
 
 #pragma mark - Separator
@@ -442,8 +446,7 @@ - (CGRect)contentViewFrame {
       _attr.shouldShowSelectorStateMask
           ? CGRectGetWidth(_editingSelectorImageView.bounds) + kEditingControlAppearanceOffset
           : accessoryViewPadding;
-  UIEdgeInsets insets = MDCInsetsMakeWithLayoutDirection(
-      0, leadingPadding, 0, trailingPadding, self.mdc_effectiveUserInterfaceLayoutDirection);
+  UIEdgeInsets insets = UIEdgeInsetsMake(0, leadingPadding, 0, trailingPadding);
   return UIEdgeInsetsInsetRect(self.bounds, insets);
 }