[iOS][Credential-Provider] Tooltip UX tweaks

Update Tooltip specs to the ones detailed in the attached bug.

Bug: 1090777
Change-Id: I4e76f3c2e168bc8e4ffd8bb1dc88fb343db817fc
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2253899
Commit-Queue: Javier Ernesto Flores Robles <javierrobles@chromium.org>
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Cr-Commit-Position: refs/heads/master@{#780269}

ios/chrome/credential_provider_extension/ui/credential_details_view_controller.mm

@@ -279,7 +279,7 @@ typedef NS_ENUM(NSInteger, RowIdentifier) {
   TooltipView* tooltip = [[TooltipView alloc] initWithKeyWindow:self.view
                                                          target:self
                                                          action:action];
-  [tooltip showMessage:message atBottomOf:cell.detailTextLabel];
+  [tooltip showMessage:message atBottomOf:cell];
 }
 
 @end

ios/chrome/credential_provider_extension/ui/tooltip_view.mm

@@ -15,9 +15,9 @@ namespace {
 
 CGFloat kTooltipTailHeight = 8;
 CGFloat kTooltipTailWidth = 16;
-CGFloat kTooltipHorizontalPadding = 10.0f;
-CGFloat kTooltipVerticalPadding = 4.0f;
-CGFloat kTooltipCornerRadius = 3.0f;
+CGFloat kTooltipHorizontalPadding = 16.0f;
+CGFloat kTooltipVerticalPadding = 10.0f;
+CGFloat kTooltipCornerRadius = 8.0f;
 CGFloat kTooltipFadeInTime = 0.2f;
 
 }  // namespace
@@ -59,7 +59,7 @@ static __weak TooltipView* _active;
 
   CGSize labelSize = [message sizeWithAttributes:@{
     NSFontAttributeName :
-        [UIFont preferredFontForTextStyle:UIFontTextStyleCallout]
+        [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline]
   }];
 
   UILabel* label = [[UILabel alloc]
@@ -68,7 +68,7 @@ static __weak TooltipView* _active;
                                labelSize.width, labelSize.height)];
   label.textAlignment = NSTextAlignmentLeft;
   label.text = message;
-  label.font = [UIFont preferredFontForTextStyle:UIFontTextStyleCallout];
+  label.font = [UIFont preferredFontForTextStyle:UIFontTextStyleSubheadline];
   label.textColor = [UIColor colorNamed:kBackgroundColor];
 
   CGFloat width = labelSize.width + 2 * kTooltipHorizontalPadding;