[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..882e2345d34da2f4d70c71ebc1ed3276998f5284 100644
--- a/third_party/WebKit/Source/core/experiments/Experiments.cpp
+++ b/third_party/WebKit/Source/core/experiments/Experiments.cpp
@@ -75,6 +75,12 @@ bool Experiments::isApiEnabled(ExecutionContext* executionContext, const String&
     return hasValidAPIKey(executionContext, apiName, errorMessage);
 }
 
+bool Experiments::isApiEnabledWithoutMessage(ExecutionContext* executionContext, const String& apiName)
+{
+    String errorMessage;
+    return isApiEnabled(executionContext, apiName, errorMessage);
+}
+
 DOMException* Experiments::createApiDisabledException(const String& apiName)
 {
     return DOMException::create(NotSupportedError, getDisabledMessage(apiName));