Allows arbitrary scale factor in ImageSkia.

ui/gfx/switches.cc

Index: ui/gfx/switches.cc
diff --git a/ui/gfx/switches.cc b/ui/gfx/switches.cc
index 2f2eb9a3b829150dd6f5a1e71f645d9b78148f11..08bd4749e41e18cc8c0c34ac6e2ae08ba5bf02db 100644
--- a/ui/gfx/switches.cc
+++ b/ui/gfx/switches.cc
@@ -22,4 +22,15 @@ const char kForceDeviceScaleFactor[] = "force-device-scale-factor";
 // Enables/Disables High DPI support (windows)
 const char kHighDPISupport[] = "high-dpi-support";
 
+// When allowed, the ImageSkia looks up the resource pack with the closest
+// available scale factor instead of the actual device scale factor and then
+// rescale on ImageSkia side.
+// In Windows: default is allowed. Specify --disallow-... to prevent this.
+// Other platforms: default is not allowed. Specify --allow-... to do this.
+const char kAllowArbitraryScaleFactorInImageSkia[] =
+    "allow-arbitrary-scale-factor-in-image-skia";
+
+const char kDisallowArbitraryScaleFactorInImageSkia[] =
+    "disallow-arbitrary-scale-factor-in-image-skia";
+
 }  // namespace switches