Introduce objectEquals for null-safe equality check

base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java

Index: base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
diff --git a/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java b/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
index 825bce7cc860035fffd2b4d64372d4277bfa1039..f773859b842dd295f56901844e80477a0e20d362 100644
--- a/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
+++ b/base/android/java/src/org/chromium/base/ApiCompatibilityUtils.java
@@ -639,4 +639,13 @@ public class ApiCompatibilityUtils {
             window.setFeatureInt(featureNumber, featureValue);
         }
     }
+
+    /**
+     *  Null-safe equivalent of {@code a.equals(b)}.
+     *
+     *  @see Objects#equals(Object, Object)
+     */
+    public static boolean objectEquals(Object a, Object b) {
+        return (a == null) ? (b == null) : a.equals(b);
+    }
 }