chromeos: Add flag for subpixel-positioned text.

This adds a --enable-text-subpixel-positioning flag that can
be set to enable unhinted, subpixel-positioned text on
Chrome OS.

BUG=125066
TEST=manual: set flag and checked that each occurrence of a given character is a unique (but not necessarily beautiful) snowflake

Review URL: https://chromiumcodereview.appspot.com/10388033

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@136041 0039d316-1c4b-4281-b951-d872f2087c98

2 files changed, 12 insertions, 7 deletions

diff --git a/ui/base/ui_base_switches.cc b/ui/base/ui_base_switches.cc
index 67ef448..773c441 100644
--- a/ui/base/ui_base_switches.cc
+++ b/ui/base/ui_base_switches.cc
@@ -8,28 +8,32 @@ namespace switches {
 
 // The default device scale factor to apply to the browser UI and
 // the contents in the absence of a viewport meta tag.
-const char kDefaultDeviceScaleFactor[]      = "default-device-scale-factor";
+const char kDefaultDeviceScaleFactor[] = "default-device-scale-factor";
 
 // Enable touch screen calibration.
-const char kDisableTouchCalibration[]       = "disable-touch-calibration";
+const char kDisableTouchCalibration[] = "disable-touch-calibration";
+
+// Let text glyphs have X-positions that aren't snapped to the pixel grid.
+const char kEnableTextSubpixelPositioning[] =
+    "enable-text-subpixel-positioning";
 
 // Enable support for touch events.
-const char kEnableTouchEvents[]             = "enable-touch-events";
+const char kEnableTouchEvents[] = "enable-touch-events";
 
 // The language file that we want to try to open. Of the form
 // language[-country] where language is the 2 letter code from ISO-639.
-const char kLang[]                          = "lang";
+const char kLang[] = "lang";
 
 // Load the locale resources from the given path. When running on Mac/Unix the
 // path should point to a locale.pak file.
-const char kLocalePak[]                     = "locale_pak";
+const char kLocalePak[] = "locale_pak";
 
 // Disable ui::MessageBox. This is useful when running as part of scripts that
 // do not have a user interface.
-const char kNoMessageBox[]                  = "no-message-box";
+const char kNoMessageBox[] = "no-message-box";
 
 // Enables UI changes that make it easier to use with a touchscreen.
-const char kTouchOptimizedUI[]              = "touch-optimized-ui";
+const char kTouchOptimizedUI[] = "touch-optimized-ui";
 
 
 #if defined(OS_MACOSX)
diff --git a/ui/base/ui_base_switches.h b/ui/base/ui_base_switches.h
index 14b4fc7..61f978f 100644
--- a/ui/base/ui_base_switches.h
+++ b/ui/base/ui_base_switches.h
@@ -15,6 +15,7 @@ namespace switches {
 
 UI_EXPORT extern const char kDefaultDeviceScaleFactor[];
 UI_EXPORT extern const char kDisableTouchCalibration[];
+UI_EXPORT extern const char kEnableTextSubpixelPositioning[];
 UI_EXPORT extern const char kEnableTouchEvents[];
 UI_EXPORT extern const char kLang[];
 UI_EXPORT extern const char kLocalePak[];