Fix background color for incognito tabs when material design is enabled

chrome/android/java/src/org/chromium/chrome/browser/ntp/NtpColorUtils.java

Index: chrome/android/java/src/org/chromium/chrome/browser/ntp/NtpColorUtils.java
diff --git a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NtpColorUtils.java b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NtpColorUtils.java
index 4d9a005acfc8041b95ceb8a156c908f646a1fac0..f96353689ffaa020b85d4b34f16f96b8d4ead669 100644
--- a/chrome/android/java/src/org/chromium/chrome/browser/ntp/NtpColorUtils.java
+++ b/chrome/android/java/src/org/chromium/chrome/browser/ntp/NtpColorUtils.java
@@ -18,10 +18,24 @@ public class NtpColorUtils {
 
     private NtpColorUtils() {}
 
-    public static int getBackgroundColorResource(Resources res) {
-        return (ChromeFeatureList.isEnabled(ChromeFeatureList.NTP_SNIPPETS)
-                       || ChromeFeatureList.isEnabled(ChromeFeatureList.NTP_MATERIAL_DESIGN))
+    public static int getBackgroundColorResource(Resources res, boolean isIncognito) {
+        if (isIncognito) {
+            return ApiCompatibilityUtils.getColor(res, R.color.ntp_bg_incognito);
+        }
+
+        return shouldUseMaterialColors()
                 ? ApiCompatibilityUtils.getColor(res, R.color.ntp_material_design_bg)
                 : ApiCompatibilityUtils.getColor(res, R.color.ntp_bg);
     }
+
+    public static int getToolbarBackgroundColorResource(Resources res) {
+        return shouldUseMaterialColors()
+                ? ApiCompatibilityUtils.getColor(res, R.color.ntp_material_design_bg)
+                : ApiCompatibilityUtils.getColor(res, R.color.ntp_bg);
+    }
+
+    private static boolean shouldUseMaterialColors() {
+        return ChromeFeatureList.isEnabled(ChromeFeatureList.NTP_SNIPPETS)
+                || ChromeFeatureList.isEnabled(ChromeFeatureList.NTP_MATERIAL_DESIGN);
+    }
 }