mac: Initialize gfx::Image from NSImage

atom.gyp

@@ -238,6 +238,7 @@
       'atom/common/native_mate_converters/gurl_converter.h',
       'atom/common/native_mate_converters/image_converter.cc',
       'atom/common/native_mate_converters/image_converter.h',
+      'atom/common/native_mate_converters/image_converter_mac.mm',
       'atom/common/native_mate_converters/string16_converter.h',
       'atom/common/native_mate_converters/v8_value_converter.cc',
       'atom/common/native_mate_converters/v8_value_converter.h',

atom/common/native_mate_converters/image_converter.cc

@@ -106,6 +106,7 @@ bool Converter<gfx::ImageSkia>::FromV8(v8::Isolate* isolate,
   return PopulateImageSkiaRepsFromPath(out, path);
 }
 
+#if !defined(OS_MACOSX)
 bool Converter<gfx::Image>::FromV8(v8::Isolate* isolate,
                                    v8::Handle<v8::Value> val,
                                    gfx::Image* out) {
@@ -116,5 +117,6 @@ bool Converter<gfx::Image>::FromV8(v8::Isolate* isolate,
   *out = gfx::Image(image);
   return true;
 }
+#endif
 
 }  // namespace mate

atom/common/native_mate_converters/image_converter_mac.mm

@@ -0,0 +1,29 @@
+// Copyright (c) 2015 GitHub, Inc.
+// Use of this source code is governed by the MIT license that can be
+// found in the LICENSE file.
+
+#include "atom/common/native_mate_converters/image_converter.h"
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/mac/foundation_util.h"
+#include "base/mac/scoped_nsobject.h"
+#include "base/strings/sys_string_conversions.h"
+#include "ui/gfx/image/image.h"
+
+namespace mate {
+
+bool Converter<gfx::Image>::FromV8(v8::Isolate* isolate,
+                                   v8::Handle<v8::Value> val,
+                                   gfx::Image* out) {
+  std::string path;
+  if (!ConvertFromV8(isolate, val, &path))
+    return false;
+
+  base::scoped_nsobject<NSImage> image([[NSImage alloc]
+      initByReferencingFile:base::SysUTF8ToNSString(path)]);
+  *out = gfx::Image(image.release());
+  return true;
+}
+
+}  // namespace mate