Compute the popup location/size correctly when use-zoom-for-dsf is enabled.

content/shell/renderer/layout_test/blink_test_runner.cc

Index: content/shell/renderer/layout_test/blink_test_runner.cc
diff --git a/content/shell/renderer/layout_test/blink_test_runner.cc b/content/shell/renderer/layout_test/blink_test_runner.cc
index c3a2eb5ade95c60d6586ab8cae7bc6b1bc5e8224..d23ce6ed20505b82ffb2102d1de7dea4a1a6b16a 100644
--- a/content/shell/renderer/layout_test/blink_test_runner.cc
+++ b/content/shell/renderer/layout_test/blink_test_runner.cc
@@ -520,6 +520,11 @@ void BlinkTestRunner::SetDeviceScaleFactor(float factor) {
   Send(new ShellViewHostMsg_SetDeviceScaleFactor(routing_id(), factor));
 }
 
+void BlinkTestRunner::EnableUseZoomForDSF() {
+  base::CommandLine::ForCurrentProcess()->
+      AppendSwitch(switches::kEnableUseZoomForDSF);
+}
+
 void BlinkTestRunner::SetDeviceColorProfile(const std::string& name) {
   content::SetDeviceColorProfile(render_view(), name);
 }