public Builder setUsernameBytes(com.google.protobuf.ByteString value) {
          if (value == null) {
            throw new NullPointerException();
          }
          checkByteStringIsUtf8(value);
          username_ = value;
          bitField0_ |= 0x00000001;
          onChanged();
          return this;
        }
<pre>
Required. The user name of the Google account.
</pre>

<code>string username = 1 [(.google.api.field_behavior) = REQUIRED];</code>

@param value The bytes for username to set.
@return This builder for chaining.
java-websecurityscanner/proto-google-cloud-websecurityscanner-v1alpha/src/main/java/com/google/cloud/websecurityscanner/v1alpha/ScanConfig.java