Zoom page content

I originally sent ctrl+ to browser to zoom, but the screenshot unzooms
so I found this method instead.

grafanimate/grafana.py

@@ -34,6 +34,7 @@ def boot_grafana(self):
         """
         log.info("Starting Grafana at {}".format(self.baseurl))
 
+        self.set_window_size(1920,1080+85*2.2)
         self.navigate(self.baseurl)
 
     def navigate(self, url):
@@ -44,6 +45,9 @@ def navigate(self, url):
         # Wait for Grafana application to load.
         self.wait_for_grafana()
 
+        # Zoom page
+        self.marionette.set_pref("layout.css.devPixelsPerPx", str(2.2))
+
         # Load Javascript for GrafanaStudio sidecar service.
         jsfiles = ["grafana-util.js", "grafana-studio.js"]
         for jsfile in jsfiles: