Add deprecation message for -webkit-background-composite

third_party/WebKit/Source/core/frame/UseCounter.cpp

 /*
  * Copyright (C) 2012 Google, Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 724 matching lines @@
     Frame* frame = document.frame();
     if (!frame)
         return;
     // Check to see if the frame can script into the top level document.
     SecurityOrigin* securityOrigin = frame->securityContext()->securityOrigin();
     Frame* top = frame->tree().top();
     if (top && !securityOrigin->canAccess(top->securityContext()->securityOrigin()))
         count(frame, feature);
 }
 
+// TODO (nainar): Migrate all console message functions to Deprecation
 static const char* milestoneString(int milestone)
 {
     switch (milestone) {
     case 50:
         return "M50, around April 2016";
+    case 51:
+        return "M51, around June 2016";
     case 53:
         return "M53, around September 2016";
     }
 
     ASSERT_NOT_REACHED();
     return nullptr;
 }
 
 static String replacedBy(const char* feature, const char* replacement)
 {
     return String::format("%s is deprecated. Please use %s instead.", feature, replacement);
 }
 
-static String willBeRemoved(const char* feature, int milestone, const char* details)
+String UseCounter::willBeRemoved(const char* feature, int milestone, const char* details)
 {
     return String::format("%s is deprecated and will be removed in %s. See https://www.chromestatus.com/features/%s for more details.", feature, milestoneString(milestone), details);
 }
 
 static String replacedWillBeRemoved(const char* feature, const char* replacement, int milestone, const char* details)
 {
     return String::format("%s is deprecated and will be removed in %s. Please use %s instead. See https://www.chromestatus.com/features/%s for more details.", feature, milestoneString(milestone), replacement, details);
 }
 
 String UseCounter::deprecationMessage(Feature feature)
@@ skipping 250 matching lines @@
 UseCounter* UseCounter::getFrom(const StyleSheetContents* sheetContents)
 {
     // FIXME: We may want to handle stylesheets that have multiple owners
     //        https://crbug.com/242125
     if (sheetContents && sheetContents->hasSingleOwnerNode())
         return getFrom(sheetContents->singleOwnerDocument());
     return 0;
 }
 
 } // namespace blink