How to enable Chrome's "continue where you left off" for OS X El Capitan?
Solution 1:
First, you want to make sure the setting is enabled in Chrome. In the upper left corner of the screen, you'll want to click on Chrome -> Preferences and make sure the "continue where you left off" button is checked.
Next, please do understand there is a difference between closing a window and closing a program. Command - Q is used to exit a program completely. In OS X, if you close a window using the "red x" in the upper left corner, you are closing out a window, and not the program.
To see this work correctly... try opening 3-4 tabs. Then press Command - Q. Then relaunch Chrome. You should see all your tabs there.
Solution 2:
To add to a previous answer (one by Charlie74), if you happen to accidentally close the window using the red x at the top, you can quickly get back all your tabs by using commandshiftT. This is usually used to reopen a recently closed tab, but also works to reopen a recently closed window.
Solution 3:
Not 100% sure what you are asking, but to get Chrome to resuming its last state:
Chrome > Settings Page (chrome://settings) > On Startup > Continue where you left off.