Share Cookies across Tabs in a Space

[weisso5]

https://github.com/ShingoFukuyama/WKWebViewTips

`self.processPool = [[WKProcessPool alloc] init];

WKWebViewConfiguration *configuration1 = [[WKWebViewConfiguration alloc] init];
configuration1.processPool = self.processPool;
WKWebView *webView1 = [[WKWebView alloc] initWithFrame:CGRectZero configuration:configuration1];
...
WKWebViewConfiguration *configuration2 = [[WKWebViewConfiguration alloc] init];
configuration2.processPool = self.processPool;
WKWebView *webView2 = [[WKWebView alloc] initWithFrame:CGRectZero configuration:configuration2];
`