extensions: Use V8 Maybe APIs in NativeHandler

extensions/renderer/v8_helpers.h

 // Copyright 2015 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.
 
 #ifndef EXTENSIONS_RENDERER_V8_HELPERS_H_
 #define EXTENSIONS_RENDERER_V8_HELPERS_H_
 
 #include <string.h>
 
 #include "v8/include/v8.h"
 
 namespace extensions {
 namespace v8_helpers {
 
 // Helper functions for V8 APIs.
 
 // Converts |str| to a V8 string. Returns true on success.
 inline bool ToV8String(v8::Isolate* isolate,
                        const char* str,
                        v8::Local<v8::String>* out) {
   return v8::String::NewFromUtf8(isolate, str, v8::NewStringType::kNormal)
       .ToLocal(out);
 }
 
+inline bool ToV8String(v8::Isolate* isolate,
+                       const std::string& str,
+                       v8::Local<v8::String>* out) {
+  return ToV8String(isolate, str.c_str(), out);
+}
+
 // Converts |str| to a V8 string.
 // This crashes when strlen(str) > v8::String::kMaxLength.
 inline v8::Local<v8::String> ToV8StringUnsafe(
     v8::Isolate* isolate,
     const char* str,
     v8::NewStringType string_type = v8::NewStringType::kNormal) {
   DCHECK(strlen(str) <= v8::String::kMaxLength);
   return v8::String::NewFromUtf8(isolate, str, string_type)
       .ToLocalChecked();
 }
@@ skipping 58 matching lines @@
 inline v8::Local<v8::Value> GetPropertyUnsafe(
     v8::Local<v8::Context> context,
     v8::Local<v8::Object> object,
     const char* key,
     v8::NewStringType string_type = v8::NewStringType::kNormal) {
   return object->Get(context,
                      ToV8StringUnsafe(context->GetIsolate(), key, string_type))
       .ToLocalChecked();
 }
 
+// Wraps v8::Function::Call(). Returns true on success.
+inline bool CallFunction(v8::Local<v8::Context> context,
+                         v8::Local<v8::Function> function,
+                         v8::Local<v8::Value> recv,
+                         int argc,
+                         v8::Local<v8::Value> argv[],
+                         v8::Local<v8::Value>* out) {
+  return function->Call(context, recv, argc, argv).ToLocal(out);
+}
+
 }  // namespace v8_helpers
 }  // namespace extensions
 
 #endif  // EXTENSIONS_RENDERER_V8_HELPERS_H_