Add WebUI::GetDeviceScale

content/browser/webui/web_ui_impl.cc

Index: content/browser/webui/web_ui_impl.cc
diff --git a/content/browser/webui/web_ui_impl.cc b/content/browser/webui/web_ui_impl.cc
index 1656b984f668dbd98d6d5763bb632cab3ae9e2b1..1050e615d39991efa60b87e50ade9829faefb82c 100644
--- a/content/browser/webui/web_ui_impl.cc
+++ b/content/browser/webui/web_ui_impl.cc
@@ -9,6 +9,7 @@
 #include "base/utf_string_conversions.h"
 #include "base/values.h"
 #include "content/browser/child_process_security_policy_impl.h"
+#include "content/browser/renderer_host/dip_util.h"
 #include "content/browser/renderer_host/render_process_host_impl.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/web_contents/web_contents_impl.h"
@@ -116,6 +117,10 @@ WebContents* WebUIImpl::GetWebContents() const {
   return web_contents_;
 }
 
+float WebUIImpl::GetDeviceScale() const {
+  return GetDIPScaleFactor(web_contents_->GetRenderWidgetHostView());
+}
+
 bool WebUIImpl::ShouldHideFavicon() const {
   return hide_favicon_;
 }