Add constant for the Cross-Origin-Opener-Policy header.

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RELNOTES=Adds constant for the Cross-Origin-Opener-Policy header.

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Created by MOE: https://github.com/google/moe
MOE_MIGRATED_REVID=272415924

Author: ralucaradu

android/guava/src/com/google/common/net/HttpHeaders.java

@@ -266,6 +266,12 @@ private ReferrerPolicyValues() {}
    * @since 20.0
    */
   public static final String X_WEBKIT_CSP_REPORT_ONLY = "X-WebKit-CSP-Report-Only";
+  /**
+   * The HTTP Cross-Origin-Opener-Policy header field name.
+   *
+   * @since NEXT
+   */
+  public static final String CROSS_ORIGIN_OPENER_POLICY = "Cross-Origin-Opener-Policy";
   /** The HTTP {@code ETag} header field name. */
   public static final String ETAG = "ETag";
   /** The HTTP {@code Expires} header field name. */

guava/src/com/google/common/net/HttpHeaders.java

@@ -266,6 +266,12 @@ private ReferrerPolicyValues() {}
    * @since 20.0
    */
   public static final String X_WEBKIT_CSP_REPORT_ONLY = "X-WebKit-CSP-Report-Only";
+  /**
+   * The HTTP Cross-Origin-Opener-Policy header field name.
+   *
+   * @since NEXT
+   */
+  public static final String CROSS_ORIGIN_OPENER_POLICY = "Cross-Origin-Opener-Policy";
   /** The HTTP {@code ETag} header field name. */
   public static final String ETAG = "ETag";
   /** The HTTP {@code Expires} header field name. */