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

content/renderer/java/gin_java_bridge_object.cc

Index: content/renderer/java/gin_java_bridge_object.cc
diff --git a/content/renderer/java/gin_java_bridge_object.cc b/content/renderer/java/gin_java_bridge_object.cc
index d2a2b60acf984fc48b35400d9be29f6d403f3efc..b4cf3bf669bf316e7e4cbf1b5fa3bad39cc33527 100644
--- a/content/renderer/java/gin_java_bridge_object.cc
+++ b/content/renderer/java/gin_java_bridge_object.cc
@@ -83,7 +83,15 @@ gin::ObjectTemplateBuilder GinJavaBridgeObject::GetObjectTemplateBuilder(
 v8::Local<v8::Value> GinJavaBridgeObject::GetNamedProperty(
     v8::Isolate* isolate,
     const std::string& property) {
-  if (dispatcher_ && dispatcher_->HasJavaMethod(object_id_, property)) {
+  std::map<std::string, bool>::iterator method_pos =
+      known_methods_.find(property);
+  if (method_pos == known_methods_.end()) {
+    if (!dispatcher_) {
+      return v8::Local<v8::Value>();
+    }
+    known_methods_[property] = dispatcher_->HasJavaMethod(object_id_, property);
+  }
+  if (known_methods_[property]) {
     return gin::CreateFunctionTemplate(
                isolate,
                base::Bind(&GinJavaBridgeObject::InvokeMethod,