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

content/renderer/java/gin_java_bridge_object.cc

 // Copyright 2014 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include "content/renderer/java/gin_java_bridge_object.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "content/common/android/gin_java_bridge_value.h"
 #include "content/public/renderer/v8_value_converter.h"
 #include "content/renderer/java/gin_java_bridge_value_converter.h"
@@ skipping 107 matching lines @@
     while (args->GetNext(&val)) {
       scoped_ptr<base::Value> arg(converter_->FromV8Value(val, context));
       if (arg.get()) {
         arguments.Append(arg.release());
       } else {
         arguments.Append(base::Value::CreateNullValue());
       }
     }
   }
 
-  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)) {
     return converter_->ToV8Value(result.get(),
                                  args->isolate()->GetCurrentContext());
   }
 
   scoped_ptr<const GinJavaBridgeValue> gin_value =
       GinJavaBridgeValue::FromValue(result.get());
   if (gin_value->IsType(GinJavaBridgeValue::TYPE_OBJECT_ID)) {
@@ skipping 13 matching lines @@
     float float_value;
     gin_value->GetAsNonFinite(&float_value);
     return v8::Number::New(args->isolate(), float_value);
   }
   return v8::Undefined(args->isolate());
 }
 
 gin::WrapperInfo GinJavaBridgeObject::kWrapperInfo = {gin::kEmbedderNativeGin};
 
 }  // namespace content