[Touch emulator] Update cursor when device scale factor changes.

content/browser/renderer_host/render_widget_host_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/renderer_host/render_widget_host_impl.h"
 
 #include <math.h>
 
 #include <set>
 #include <tuple>
@@ skipping 1402 matching lines @@
 }
 
 void RenderWidgetHostImpl::NotifyScreenInfoChanged() {
   if (delegate_)
     delegate_->ScreenInfoChanged();
 
   // The resize message (which may not happen immediately) will carry with it
   // the screen info as well as the new size (if the screen has changed scale
   // factor).
   WasResized();
+
+  if (touch_emulator_) {
+    touch_emulator_->SetDeviceScaleFactor(
+        view_.get() ? content::GetScaleFactorForView(view_.get()) : 1.0f);
+  }
 }
 
 void RenderWidgetHostImpl::GetSnapshotFromBrowser(
     const GetSnapshotFromBrowserCallback& callback) {
   int id = next_browser_snapshot_id_++;
 
 #if defined(OS_MACOSX)
   // MacOS version of underlying GrabViewSnapshot() blocks while
   // display/GPU are in a power-saving mode, so make sure display
   // does not go to sleep for the duration of reading a snapshot.
@@ skipping 1065 matching lines @@
     // Note: We are using the origin URL provided by the sender here. It may be
     // different from the receiver's.
     file_system_file.url =
         GURL(storage::GetIsolatedFileSystemRootURIString(
                  file_system_url.origin(), filesystem_id, std::string())
                  .append(register_name));
   }
 }
 
 }  // namespace content