Teach gfx::Screen about color profiles

ui/gfx/screen_ios.mm

Index: ui/gfx/screen_ios.mm
diff --git a/ui/gfx/screen_ios.mm b/ui/gfx/screen_ios.mm
index f630f00a9f04740d20bea44f922b22f7a380af73..b656176996101daccd8f303803e799bb50b06d4f 100644
--- a/ui/gfx/screen_ios.mm
+++ b/ui/gfx/screen_ios.mm
@@ -53,6 +53,13 @@ class ScreenIos : public gfx::Screen {
     return gfx::Display();
   }
 
+  // Returns the color profile of the display nearest the window.
+  virtual bool GetDisplayColorProfile(
+      gfx::NativeView view, std::vector<char>* color_profile) const OVERRIDE {
+    // TODO(port): consider screen color profile support.
+    return false;
+  }
+
   // Returns the the display nearest the specified point.
   virtual gfx::Display GetDisplayNearestPoint(
       const gfx::Point& point) const OVERRIDE {