color: Add --force-color-profile command line flag

ui/gfx/switches.cc

Index: ui/gfx/switches.cc
diff --git a/ui/gfx/switches.cc b/ui/gfx/switches.cc
index 98c4cad5b7d19fadbc70847cec1cfead84c9428c..51b760914e88671703d41ba8286d28df0305e430 100644
--- a/ui/gfx/switches.cc
+++ b/ui/gfx/switches.cc
@@ -25,4 +25,8 @@ const char kHeadless[] = "headless";
 // before operating on them.
 const char kEnableColorCorrectRendering[] = "enable-color-correct-rendering";
 
+// Force all monitors to be treated as though they have the specified color
+// profile. Accepted values are "srgb" and "generic-rgb".
+const char kForceColorProfile[] = "force-color-profile";
+
 }  // namespace switches