[bindings] Implement an ExperimentEnabled IDL extended attribute.

third_party/WebKit/Source/core/experiments/Experiments.cpp

Index: third_party/WebKit/Source/core/experiments/Experiments.cpp
diff --git a/third_party/WebKit/Source/core/experiments/Experiments.cpp b/third_party/WebKit/Source/core/experiments/Experiments.cpp
index cdcfd4fb2abaa2ad65ffdebfbb2dda98b90f7838..fafc05b312f325140e7b971914472c84910a3e9b 100644
--- a/third_party/WebKit/Source/core/experiments/Experiments.cpp
+++ b/third_party/WebKit/Source/core/experiments/Experiments.cpp
@@ -57,6 +57,17 @@ bool hasValidAPIKey(ExecutionContext* executionContext, const String& apiName, S
 
 bool Experiments::isApiEnabled(ExecutionContext* executionContext, const String& apiName, String& errorMessage)
 {
+    return isApiEnabledInternal(executionContext, apiName, errorMessage);
+}
+
+bool Experiments::isApiEnabled(ExecutionContext* executionContext, const String& apiName)
+{
+    String errorMessage;
+    return isApiEnabledInternal(executionContext, apiName, errorMessage);
+}
+
+bool Experiments::isApiEnabledInternal(ExecutionContext* executionContext, const String& apiName, String& errorMessage)
+{
     if (!RuntimeEnabledFeatures::experimentalFrameworkEnabled()) {
         errorMessage = "Experimental Framework is not enabled.";
         return false;