support horizontal scroll and zoon for webview

Bug: 37913717
Test: Manual test for horizontal scroll
Change-Id: I97f19030ae034910c8d6f3e23634f55d43ab6589

packages/CarrierDefaultApp/src/com/android/carrierdefaultapp/CaptivePortalLoginActivity.java

@@ -96,6 +96,10 @@ public class CaptivePortalLoginActivity extends Activity {
         WebSettings webSettings = mWebView.getSettings();
         webSettings.setJavaScriptEnabled(true);
         webSettings.setMixedContentMode(WebSettings.MIXED_CONTENT_COMPATIBILITY_MODE);
+        webSettings.setUseWideViewPort(true);
+        webSettings.setLoadWithOverviewMode(true);
+        webSettings.setSupportZoom(true);
+        webSettings.setBuiltInZoomControls(true);
         mWebViewClient = new MyWebViewClient();
         mWebView.setWebViewClient(mWebViewClient);
         mWebView.setWebChromeClient(new MyWebChromeClient());