[Android] Cache injected Java objects' methods info on renderer side

content/renderer/java/gin_java_bridge_object.h

Index: content/renderer/java/gin_java_bridge_object.h
diff --git a/content/renderer/java/gin_java_bridge_object.h b/content/renderer/java/gin_java_bridge_object.h
index 97b74c5e4fe386ddefe5514df059b80513b8f2bb..2f6c6e4306aa389fe46f8f94a1fe27a861a9c23f 100644
--- a/content/renderer/java/gin_java_bridge_object.h
+++ b/content/renderer/java/gin_java_bridge_object.h
@@ -5,7 +5,7 @@
 #ifndef CONTENT_RENDERER_JAVA_GIN_JAVA_BRIDGE_OBJECT_H_
 #define CONTENT_RENDERER_JAVA_GIN_JAVA_BRIDGE_OBJECT_H_
 
-#include <set>
+#include <map>
 
 #include "base/memory/scoped_ptr.h"
 #include "base/memory/weak_ptr.h"
@@ -61,6 +61,7 @@ class GinJavaBridgeObject : public gin::Wrappable<GinJavaBridgeObject>,
   base::WeakPtr<GinJavaBridgeDispatcher> dispatcher_;
   GinJavaBridgeDispatcher::ObjectID object_id_;
   scoped_ptr<GinJavaBridgeValueConverter> converter_;
+  std::map<std::string, bool> known_methods_;
 
   DISALLOW_COPY_AND_ASSIGN(GinJavaBridgeObject);
 };