Use V8 Maybe APIs in extensions/renderer

extensions/renderer/v8_maybe_helpers.h

Index: extensions/renderer/v8_maybe_helpers.h
diff --git a/extensions/renderer/v8_maybe_helpers.h b/extensions/renderer/v8_maybe_helpers.h
new file mode 100644
index 0000000000000000000000000000000000000000..70117120d3650d3fa774ae2ba02a2be5a9f2dddf
--- /dev/null
+++ b/extensions/renderer/v8_maybe_helpers.h
@@ -0,0 +1,46 @@
+// 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_MAYBE_HELPERS_H_
+#define EXTENSIONS_RENDERER_V8_MAYBE_HELPERS_H_
+
+namespace extensions {
+
+// This crashes when strlen(str) >= v8::String::kMaxLength.
+inline v8::Local<v8::String> ToV8String(
+    v8::Isolate* isolate,
+    const char* str,
+    v8::NewStringType string_type = v8::NewStringType::kNormal) {
+  return v8::String::NewFromUtf8(isolate, str, string_type)
+      .ToLocalChecked();
+}
+
+inline bool CheckV8Call(v8::Maybe<bool> maybe) {
+  return maybe.IsJust() && maybe.FromJust();
+}
+
+inline bool SetProperty(v8::Local<v8::Context> context,
+                        v8::Local<v8::Object> object,
+                        v8::Local<v8::Value> key,
+                        v8::Local<v8::Value> value) {
+  return CheckV8Call(object->Set(context, key, value));
+}
+
+inline bool SetProperty(v8::Local<v8::Context> context,
+                        v8::Local<v8::Object> object,
+                        uint32_t index,
+                        v8::Local<v8::Value> value) {
+  return CheckV8Call(object->Set(context, index, value));
+}
+
+// This crashes when an exception is thrown.
+inline v8::Local<v8::Value> UnsafeGet(v8::Local<v8::Context> context,
+                                      v8::Local<v8::Object> object,
+                                      v8::Local<v8::Value> key) {
+  return object->Get(context, key).ToLocalChecked();
+}
+
+}  // namespace extensions
+
+#endif  // EXTENSIONS_RENDERER_V8_MAYBE_HELPERS_H_