Merge the tonic layer from skydart branch back to master

sky/engine/tonic/dart_builtin.cc

Index: sky/engine/tonic/dart_builtin.cc
diff --git a/sky/engine/tonic/dart_builtin.cc b/sky/engine/tonic/dart_builtin.cc
new file mode 100644
index 0000000000000000000000000000000000000000..9a8f5356ab724f8bdbae0ee2c192d49e5c8449c3
--- /dev/null
+++ b/sky/engine/tonic/dart_builtin.cc
@@ -0,0 +1,50 @@
+// 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.
+
+#include "sky/engine/config.h"
+#include "sky/engine/tonic/dart_builtin.h"
+
+#include <stdlib.h>
+#include <string.h>
+
+#include "base/logging.h"
+
+namespace blink {
+
+DartBuiltin::DartBuiltin(const Natives* natives, size_t count)
+    : natives_(natives), count_(count) {
+}
+
+DartBuiltin::~DartBuiltin() {
+}
+
+Dart_NativeFunction DartBuiltin::Resolver(Dart_Handle name,
+                                          int argument_count,
+                                          bool* auto_setup_scope) const {
+  const char* function_name = nullptr;
+  Dart_Handle result = Dart_StringToCString(name, &function_name);
+  DART_CHECK_VALID(result);
+  DCHECK(function_name != nullptr);
+  DCHECK(auto_setup_scope != nullptr);
+  *auto_setup_scope = true;
+  for (size_t i = 0; i < count_; ++i) {
+    const Natives& entry = natives_[i];
+    if (!strcmp(function_name, entry.name) &&
+        (entry.argument_count == argument_count)) {
+      return entry.function;
+    }
+  }
+  return nullptr;
+}
+
+const uint8_t* DartBuiltin::Symbolizer(Dart_NativeFunction native_function) const {
+  for (size_t i = 0; i < count_; ++i) {
+    const Natives& entry = natives_[i];
+    if (entry.function == native_function)
+      return reinterpret_cast<const uint8_t*>(entry.name);
+  }
+  return nullptr;
+}
+
+}  // namespace blink