Pass the device scale factor in the command line to renderer processes.

ui/base/resource/resource_bundle.cc

Index: ui/base/resource/resource_bundle.cc
diff --git a/ui/base/resource/resource_bundle.cc b/ui/base/resource/resource_bundle.cc
index 83aba3c0e988dc3a2829ae4cdc3ea7f7cbd52a3e..675f0bee798ab41bf1920d054a1e002dd3a771c6 100644
--- a/ui/base/resource/resource_bundle.cc
+++ b/ui/base/resource/resource_bundle.cc
@@ -605,7 +605,10 @@ void ResourceBundle::InitSharedInstance(Delegate* delegate) {
 #if defined(OS_WIN)
   // Must be called _after_ supported scale factors are set since it
   // uses them.
-  ui::win::InitDeviceScaleFactor();
+  // Don't initialize the device scale factor if it has already been
+  // initialized.
+  if (!gfx::win::GetDeviceScaleFactor())

[sky, 2014/06/03 20:11:43]

Wouldn't this hit the DCHECK?

[ananta, 2014/06/03 20:43:24]

This wouldn't because the scale factor would be initialized in ContentMainRunner
before this code runs.

+    ui::win::InitDeviceScaleFactor();
 #endif
 }