[Android] Java Bridge with Gin: implement Java Bridge dispatcher

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 a153f2ae3fc1fcea86e86b9e6f3d0628cc0a731a..874ea602e5b1efa89175d1d2c0ed7bc446f01d6e 100644
--- a/content/renderer/java/gin_java_bridge_object.cc
+++ b/content/renderer/java/gin_java_bridge_object.cc
@@ -125,11 +125,12 @@ v8::Handle<v8::Value> GinJavaBridgeObject::InvokeMethod(
     }
   }
 
-  scoped_ptr<base::Value> result =
-      dispatcher_->InvokeJavaMethod(object_id_, name, arguments);
+  std::string error_message;
+  scoped_ptr<base::Value> result = dispatcher_->InvokeJavaMethod(
+      object_id_, name, arguments, &error_message);
   if (!result.get()) {
     args->isolate()->ThrowException(v8::Exception::Error(gin::StringToV8(
-        args->isolate(), kMethodInvocationErrorMessage)));
+        args->isolate(), error_message)));
     return v8::Undefined(args->isolate());
   }
   if (!result->IsType(base::Value::TYPE_BINARY)) {