INPUT element: Deprecate case-insensitive matching for radio button group names.

third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp

Index: third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
diff --git a/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp b/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
index 73b2271d731cebd4f833f4079b97ce72129d74fe..75a93886b5cfb3fd8908f71393e3ba5ee66e5687 100644
--- a/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
+++ b/third_party/WebKit/Source/core/html/forms/RadioButtonGroupScope.cpp
@@ -21,11 +21,30 @@
 #include "core/html/forms/RadioButtonGroupScope.h"
 
 #include "core/InputTypeNames.h"
+#include "core/frame/Deprecation.h"
+#include "core/frame/FrameConsole.h"
+#include "core/frame/LocalFrame.h"
 #include "core/html/HTMLInputElement.h"
+#include "core/inspector/ConsoleMessage.h"
 #include "wtf/HashMap.h"
 
 namespace blink {
 
+namespace {
+
+void addSingletonDeprecationMessage(const LocalFrame* frame,
+                                    UseCounter::Feature feature,
+                                    const AtomicString& name1,
+                                    const AtomicString& name2) {
+  if (!frame)
+    return;
+  frame->console().addSingletonMessage(ConsoleMessage::create(
+      DeprecationMessageSource, WarningMessageLevel,
+      Deprecation::deprecationMessage(feature) + " Comparing name=" + name1 +
+          " and name=" + name2));
+}
+}
+
 class RadioButtonGroup : public GarbageCollected<RadioButtonGroup> {
  public:
   static RadioButtonGroup* create();
@@ -218,15 +237,18 @@ void RadioButtonGroupScope::addButton(HTMLInputElement* element) {
   if (!keyValue->value) {
     keyValue->value = RadioButtonGroup::create();
   } else {
-    if (keyValue->key == element->name())
+    if (keyValue->key == element->name()) {
       UseCounter::count(element->document(),
                         UseCounter::RadioNameMatchingStrict);
-    else if (equalIgnoringASCIICase(keyValue->key, element->name()))
-      UseCounter::count(element->document(),
-                        UseCounter::RadioNameMatchingASCIICaseless);
-    else
-      UseCounter::count(element->document(),
-                        UseCounter::RadioNameMatchingCaseFolding);
+    } else if (equalIgnoringASCIICase(keyValue->key, element->name())) {
+      addSingletonDeprecationMessage(element->document().frame(),
+                                     UseCounter::RadioNameMatchingASCIICaseless,
+                                     keyValue->key, element->name());
+    } else {
+      addSingletonDeprecationMessage(element->document().frame(),
+                                     UseCounter::RadioNameMatchingCaseFolding,
+                                     keyValue->key, element->name());
+    }
   }
   keyValue->value->add(element);
 }