[iOS][Dark mode] Update colors on incognito NTP

See the attached bug for a screenshot.

Bug: 1002040
Change-Id: I3143aec972fe6cd172ab1de625d51c3e02159d4a
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1790884Reviewed-by: Gauthier Ambard <gambard@chromium.org>
Commit-Queue: Robbie Gibson <rkgibson@google.com>
Cr-Commit-Position: refs/heads/master@{#694737}

ios/chrome/browser/ui/ntp/BUILD.gn

@@ -113,6 +113,7 @@ source_set("ntp_internal") {
     "//ios/chrome/browser/web_state_list",
     "//ios/chrome/common",
     "//ios/chrome/common/app_group",
+    "//ios/chrome/common/colors",
     "//ios/chrome/common/favicon",
     "//ios/chrome/common/ntp_tile",
     "//ios/chrome/common/ui_util",

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

@@ -14,6 +14,8 @@
 #import "ios/chrome/browser/ui/util/uikit_ui_util.h"
 #import "ios/chrome/browser/url_loading/url_loading_params.h"
 #import "ios/chrome/browser/url_loading/url_loading_service.h"
+#import "ios/chrome/common/colors/dynamic_color_util.h"
+#import "ios/chrome/common/colors/semantic_color_names.h"
 #import "ios/chrome/common/string_util.h"
 #import "ios/chrome/common/ui_util/constraints_ui_util.h"
 #import "ios/third_party/material_components_ios/src/components/Buttons/src/MaterialButtons.h"
@@ -38,8 +40,6 @@ const CGFloat kStackViewImageSpacing = 22.0;
 const CGFloat kLayoutGuideVerticalMargin = 8.0;
 const CGFloat kLayoutGuideMinHeight = 12.0;
 
-const int kLinkColor = 0x3A8FFF;
-
 // The URL for the the Learn More page shown on incognito new tab.
 // Taken from ntp_resource_cache.cc.
 const char kLearnMoreIncognitoUrl[] =
@@ -59,7 +59,9 @@ UIFont* TitleFont() {
 
 // Returns the color to use for body text.
 UIColor* BodyTextColor() {
-  return [UIColor colorWithWhite:1.0 alpha:0.7];
+  return color::DarkModeDynamicColor(
+      [UIColor colorNamed:kTextSecondaryColor], true,
+      [UIColor colorNamed:kTextSecondaryDarkColor]);
 }
 
 // Returns a font, scaled to the current dynamic type settings, that is suitable
@@ -167,11 +169,16 @@ NSAttributedString* FormatHTMLListForUILabel(NSString* listString) {
     [_containerView addSubview:_stackView];
 
     // Incognito image.
-    UIImageView* incognitoImage = [[UIImageView alloc]
-        initWithImage:[UIImage imageNamed:@"incognito_icon"]];
-    [_stackView addArrangedSubview:incognitoImage];
+    UIImage* incognitoImage = [[UIImage imageNamed:@"incognito_icon"]
+        imageWithRenderingMode:UIImageRenderingModeAlwaysTemplate];
+    UIImageView* incognitoImageView =
+        [[UIImageView alloc] initWithImage:incognitoImage];
+    incognitoImageView.tintColor = color::DarkModeDynamicColor(
+        [UIColor colorNamed:kTextPrimaryColor], true,
+        [UIColor colorNamed:kTextPrimaryDarkColor]);
+    [_stackView addArrangedSubview:incognitoImageView];
     [_stackView setCustomSpacing:kStackViewImageSpacing
-                       afterView:incognitoImage];
+                       afterView:incognitoImageView];
 
     [self addTextSections];
 
@@ -355,9 +362,13 @@ NSAttributedString* FormatHTMLListForUILabel(NSString* listString) {
 
 // Adds views containing the text of the incognito page to |_stackView|.
 - (void)addTextSections {
-  UIColor* titleTextColor = [UIColor whiteColor];
+  UIColor* titleTextColor =
+      color::DarkModeDynamicColor([UIColor colorNamed:kTextPrimaryColor], true,
+                                  [UIColor colorNamed:kTextPrimaryDarkColor]);
   UIColor* bodyTextColor = BodyTextColor();
-  UIColor* linkTextColor = UIColorFromRGB(kLinkColor);
+  UIColor* linkTextColor =
+      color::DarkModeDynamicColor([UIColor colorNamed:kBlueColor], true,
+                                  [UIColor colorNamed:kBlueDarkColor]);
 
   // Title.
   UILabel* titleLabel = [[UILabel alloc] initWithFrame:CGRectZero];

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

@@ -11,6 +11,8 @@
 #import "ios/chrome/browser/ui/ntp/incognito_view.h"
 #import "ios/chrome/browser/ui/util/uikit_ui_util.h"
 #import "ios/chrome/browser/url_loading/url_loading_service.h"
+#import "ios/chrome/common/colors/dynamic_color_util.h"
+#import "ios/chrome/common/colors/semantic_color_names.h"
 
 #if !defined(__has_feature) || !__has_feature(objc_arc)
 #error "This file requires ARC support."
@@ -35,13 +37,19 @@
 }
 
 - (void)viewDidLoad {
+  if (@available(iOS 13, *)) {
+    self.overrideUserInterfaceStyle = UIUserInterfaceStyleDark;
+  }
+
   self.incognitoView = [[IncognitoView alloc] initWithFrame:self.view.bounds
                                           urlLoadingService:_urlLoadingService];
   [self.incognitoView setAutoresizingMask:UIViewAutoresizingFlexibleHeight |
                                           UIViewAutoresizingFlexibleWidth];
 
-  [self.incognitoView
-      setBackgroundColor:[UIColor colorWithWhite:34 / 255.0 alpha:1.0]];
+  UIColor* backgroundColor =
+      color::DarkModeDynamicColor([UIColor colorNamed:kBackgroundColor], true,
+                                  [UIColor colorNamed:kBackgroundDarkColor]);
+  self.incognitoView.backgroundColor = backgroundColor;
 
   [self.view addSubview:self.incognitoView];
 }