Add WebUI::GetDeviceScale

content/browser/webui/web_ui_impl.cc

 // Copyright (c) 2012 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/browser/webui/web_ui_impl.h"
 
 #include "base/json/json_writer.h"
 #include "base/stl_util.h"
 #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"
 #include "content/common/view_messages.h"
 #include "content/public/browser/content_browser_client.h"
 #include "content/public/browser/web_contents_delegate.h"
 #include "content/public/browser/web_contents_view.h"
 #include "content/public/browser/web_ui_controller.h"
 #include "content/public/browser/web_ui_controller_factory.h"
 #include "content/public/browser/web_ui_message_handler.h"
@@ skipping 87 matching lines @@
   render_view_host->SetWebUIProperty("toolkit", "views");
 #elif defined(TOOLKIT_GTK)
   render_view_host->SetWebUIProperty("toolkit", "GTK");
 #endif  // defined(TOOLKIT_VIEWS)
 }
 
 WebContents* WebUIImpl::GetWebContents() const {
   return web_contents_;
 }
 
+float WebUIImpl::GetDeviceScale() const {
+  return GetDIPScaleFactor(web_contents_->GetRenderWidgetHostView());
+}
+
 bool WebUIImpl::ShouldHideFavicon() const {
   return hide_favicon_;
 }
 
 void WebUIImpl::HideFavicon() {
   hide_favicon_ = true;
 }
 
 bool WebUIImpl::ShouldFocusLocationBarByDefault() const {
   return focus_location_bar_by_default_;
@@ skipping 131 matching lines @@
   handler->set_web_ui(this);
   handler->RegisterMessages();
   handlers_.push_back(handler);
 }
 
 void WebUIImpl::ExecuteJavascript(const string16& javascript) {
   static_cast<RenderViewHostImpl*>(
       web_contents_->GetRenderViewHost())->ExecuteJavascriptInWebFrame(
       ASCIIToUTF16(frame_xpath_), javascript);
 }