Pass device scale factor from display to ws.

services/ui/display/platform_screen_stub.cc

Index: services/ui/display/platform_screen_stub.cc
diff --git a/services/ui/display/platform_screen_stub.cc b/services/ui/display/platform_screen_stub.cc
index 6a23e25b8547de2c6a109d5de46f68552c12d7db..7ac7bae456ed08eb463e893b9466d605e3d3f122 100644
--- a/services/ui/display/platform_screen_stub.cc
+++ b/services/ui/display/platform_screen_stub.cc
@@ -17,6 +17,7 @@ namespace display {
 namespace {
 
 const int64_t kDisplayId = 1;
+constexpr gfx::Size kDisplaySize(1024, 768);
 
 }  // namespace
 
@@ -30,7 +31,8 @@ PlatformScreenStub::PlatformScreenStub() : weak_ptr_factory_(this) {}
 PlatformScreenStub::~PlatformScreenStub() {}
 
 void PlatformScreenStub::FixedSizeScreenConfiguration() {
-  delegate_->OnDisplayAdded(kDisplayId, gfx::Rect(1024, 768));
+  delegate_->OnDisplayAdded(kDisplayId, gfx::Rect(kDisplaySize), kDisplaySize,
+                            1.0f);
 }
 
 void PlatformScreenStub::AddInterfaces(shell::InterfaceRegistry* registry) {}