Expose counters in javascript.

src/extensions/counters-extension.h

Index: src/extensions/counters-extension.h
diff --git a/src/extensions/gc-extension.h b/src/extensions/counters-extension.h
similarity index 85%
copy from src/extensions/gc-extension.h
copy to src/extensions/counters-extension.h
index 06ea4ed21a63d40db4f1aebfd5acd165e675affe..809b3bd220b6151d0bc9cc7591b55cb2217879d0 100644
--- a/src/extensions/gc-extension.h
+++ b/src/extensions/counters-extension.h
@@ -25,20 +25,20 @@
 // (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 // OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 
-#ifndef V8_EXTENSIONS_GC_EXTENSION_H_
-#define V8_EXTENSIONS_GC_EXTENSION_H_
+#ifndef V8_EXTENSIONS_COUNTERS_EXTENSION_H_
+#define V8_EXTENSIONS_COUNTERS_EXTENSION_H_
 
 #include "v8.h"
 
 namespace v8 {
 namespace internal {
 
-class GCExtension : public v8::Extension {
+class CountersExtension : public v8::Extension {
  public:
-  GCExtension() : v8::Extension("v8/gc", kSource) {}
+  CountersExtension() : v8::Extension("v8/counters", kSource) {}
   virtual v8::Handle<v8::FunctionTemplate> GetNativeFunction(
       v8::Handle<v8::String> name);
-  static v8::Handle<v8::Value> GC(const v8::Arguments& args);
+  static v8::Handle<v8::Value> GetCounters(const v8::Arguments& args);
   static void Register();
  private:
   static const char* const kSource;
@@ -46,4 +46,4 @@ class GCExtension : public v8::Extension {
 
 } }  // namespace v8::internal
 
-#endif  // V8_EXTENSIONS_GC_EXTENSION_H_
+#endif  // V8_EXTENSIONS_COUNTERS_EXTENSION_H_