[linux] Allow font to use below 1.0f scale

chrome/common/chrome_switches.cc

Index: chrome/common/chrome_switches.cc
diff --git a/chrome/common/chrome_switches.cc b/chrome/common/chrome_switches.cc
index b01eed8fae993073c469f64894d12d5e44f39cc3..bf9d210fe807b48210ab6fb61a14656dc6e7d9d4 100644
--- a/chrome/common/chrome_switches.cc
+++ b/chrome/common/chrome_switches.cc
@@ -1287,6 +1287,12 @@ extern const char kDisableInputImeAPI[] = "disable-input-ime-api";
 extern const char kEnableInputImeAPI[] = "enable-input-ime-api";
 #endif
 
+#if defined(OS_LINUX)
+// Use X's DPI to determine the device scale factor instead of
+// gtk's font setting.
+const char kEnableXDPIForDSF[] = "enable-xdpi-for-dsf";
+#endif
+
 bool AboutInSettingsEnabled() {
   return SettingsWindowEnabled() &&
          !base::CommandLine::ForCurrentProcess()->HasSwitch(