pause/destroy webview when activity is paused/destroyed

src/org/thoughtcrime/securesms/WebViewActivity.java

@@ -113,16 +113,24 @@ public class WebViewActivity extends PassphraseRequiredActionBarActivity
     }
   }
 
+  @Override
+  protected void onPause() {
+    super.onPause();
+    webView.onPause();
+  }
+
   @Override
   public void onResume() {
     super.onResume();
     dynamicTheme.onResume(this);
     dynamicLanguage.onResume(this);
+    webView.onResume();
   }
 
   @Override
   protected void onDestroy() {
     super.onDestroy();
+    webView.destroy();
   }
 
   @Override