CaptivePortalLogin: set mixed content policy to compatibility.

This makes the policy for mixed HTTP/HTTPS content match Chrome.
This allows us to display login pages where unimportant
subresources are HTTP.

Bug: 32171569

(cherry picked from commit 625166377b)

Change-Id: Ia82958192d978280715442e182c34f9da5c88c66

packages/CaptivePortalLogin/src/com/android/captiveportallogin/CaptivePortalLoginActivity.java

@@ -115,6 +115,7 @@ public class CaptivePortalLoginActivity extends Activity {
         myWebView.clearCache(true);
         WebSettings webSettings = myWebView.getSettings();
         webSettings.setJavaScriptEnabled(true);
+        webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE);
         mWebViewClient = new MyWebViewClient();
         myWebView.setWebViewClient(mWebViewClient);
         myWebView.setWebChromeClient(new MyWebChromeClient());