Google has just announced a new stable version of Chrome. Version 39.0.2171.59 (which is almost the same version number as the Beta) contains several bug fixes, performance improvements and it will also get the new theme-color attribute along with merging of Chrome tabs into recents screen on Android 5.0 Lollipop running devices.
According to Google, version 39 will become available in a couple of hours on the Play Store, mean while you can already manually install the latest version of Chrome for Android. Keep in mind that Android 4.0 and higher is required in order to do so. You can Download Chrome APK v39.0.2171.59 with file name: com.android.chrome-v39.0.2171.59.apk