Count usage of PROGRESS element with -webkit-appearance:none.

third_party/WebKit/Source/core/html/HTMLProgressElement.cpp

Index: third_party/WebKit/Source/core/html/HTMLProgressElement.cpp
diff --git a/third_party/WebKit/Source/core/html/HTMLProgressElement.cpp b/third_party/WebKit/Source/core/html/HTMLProgressElement.cpp
index 1b6f5d5686b4ab61741a2a69205ff17b2fdbf6aa..2126672e2d69e065443ebb79b309ba0ddb5da6c3 100644
--- a/third_party/WebKit/Source/core/html/HTMLProgressElement.cpp
+++ b/third_party/WebKit/Source/core/html/HTMLProgressElement.cpp
@@ -58,8 +58,11 @@ HTMLProgressElement* HTMLProgressElement::create(Document& document)
 
 LayoutObject* HTMLProgressElement::createLayoutObject(const ComputedStyle& style)
 {
-    if (!style.hasAppearance() || openShadowRoot())
+    if (!style.hasAppearance()) {
+        UseCounter::count(document(), UseCounter::ProgressElementWithNoneAppearance);
         return LayoutObject::createObject(this, style);
+    }
+    UseCounter::count(document(), UseCounter::ProgressElementWithProgressBarAppearance);
     return new LayoutProgress(this);
 }