Fix the text color of the omnibox

This CL fixes the color of the clean toolbar's omnibox in incognito.

Bug: 791462, 791461
Cq-Include-Trybots: master.tryserver.chromium.mac:ios-simulator-cronet;master.tryserver.chromium.mac:ios-simulator-full-configs
Change-Id: I63644f78f348b2553a1bd5ac6b2ef33f3d3f12bb
Reviewed-on: https://chromium-review.googlesource.com/805694
Commit-Queue: Gauthier Ambard <gambard@chromium.org>
Reviewed-by: Stepan Khapugin <stkhapugin@chromium.org>
Cr-Commit-Position: refs/heads/master@{#521315}

ios/chrome/browser/ui/toolbar/clean/toolbar_coordinator.mm

@@ -139,6 +139,21 @@
                                    tintColor:tintColor];
   _locationBar = base::MakeUnique<LocationBarControllerImpl>(
       self.locationBarView, self.browserState, self, self.dispatcher);
+  self.locationBarView.incognito = isIncognito;
+  self.locationBarView.textField.incognito = isIncognito;
+  if (isIncognito) {
+    [_locationBarView.textField
+        setSelectedTextBackgroundColor:[UIColor colorWithWhite:1 alpha:0.1]];
+    [_locationBarView.textField
+        setPlaceholderTextColor:[UIColor colorWithWhite:1 alpha:0.5]];
+  } else if (!IsIPadIdiom()) {
+    // Set placeholder text color to match fakebox placeholder text color when
+    // on iPhone.
+    UIColor* placeholderTextColor =
+        [UIColor colorWithWhite:kiPhoneOmniboxPlaceholderColorBrightness
+                          alpha:1.0];
+    [_locationBarView.textField setPlaceholderTextColor:placeholderTextColor];
+  }
 
   self.keyboardDelegate = [[ToolbarAssistiveKeyboardDelegateImpl alloc] init];
   self.keyboardDelegate.dispatcher = self.dispatcher;