Enable subpixel positioning for internal display with dsf larger than 1.0

ui/gfx/font_render_params_linux_unittest.cc

Index: ui/gfx/font_render_params_linux_unittest.cc
diff --git a/ui/gfx/font_render_params_linux_unittest.cc b/ui/gfx/font_render_params_linux_unittest.cc
index f89c3967067535c521260ccac86a03eff8b8a5dc..e1821621e4fed3dcad2b0073c0492a732174780d 100644
--- a/ui/gfx/font_render_params_linux_unittest.cc
+++ b/ui/gfx/font_render_params_linux_unittest.cc
@@ -273,6 +273,19 @@ TEST_F(FontRenderParamsTest, ForceFullHintingWhenAntialiasingIsDisabled) {
   EXPECT_FALSE(params.subpixel_positioning);
 }
 
+#if defined(OS_CHROMEOS)
+TEST_F(FontRenderParamsTest, ForceSubpixelPositioning) {
+  SetFontRenderParamsDeviceScaleFactor(1.25f);

[Daniel Erat, 2014/08/20 20:14:42]

nit: do a query before you increase it to 1.25 and check that subpixel
positioning is disabled?

[oshima, 2014/08/20 21:54:40]

Done.

+
+  // Subpixel positioning should be forced.
+  FontRenderParams params =
+      GetFontRenderParams(FontRenderParamsQuery(false), NULL);
+  EXPECT_TRUE(params.antialiasing);
+  EXPECT_TRUE(params.subpixel_positioning);
+  SetFontRenderParamsDeviceScaleFactor(1.0f);
+}
+#endif
+
 TEST_F(FontRenderParamsTest, OnlySetConfiguredValues) {
   // Configure the LinuxFontDelegate (which queries GtkSettings on desktop
   // Linux) to request subpixel rendering.