nativeImage: adding setTemplateImage method

atom/common/api/atom_api_native_image.cc

@@ -138,6 +138,9 @@ mate::ObjectTemplateBuilder NativeImage::GetObjectTemplateBuilder(
         .SetMethod("toDataUrl", &NativeImage::ToDataURL)
         .SetMethod("isEmpty", &NativeImage::IsEmpty)
         .SetMethod("getSize", &NativeImage::GetSize)
+        #if defined(OS_MACOSX)
+        .SetMethod("setTemplateImage", &NativeImage::SetTemplateImage)
+        #endif
         .Build());
 
   return mate::ObjectTemplateBuilder(

atom/common/api/atom_api_native_image.h

@@ -62,6 +62,7 @@ class NativeImage : public mate::Wrappable {
 #if defined(OS_MACOSX)
   // Mark the image as template image if possible.
   static void MakeTemplateImage(gfx::Image* image);
+  void SetTemplateImage(bool setAsTemplate);
 #endif
 
   v8::Handle<v8::Value> ToPNG(v8::Isolate* isolate);

atom/common/api/atom_api_native_image_mac.mm

@@ -15,6 +15,10 @@ void NativeImage::MakeTemplateImage(gfx::Image* image) {
   [image->AsNSImage() setTemplate:YES];
 }
 
+void NativeImage::SetTemplateImage(bool setAsTemplate) {
+  [image_.AsNSImage() setTemplate:setAsTemplate];
+}
+
 }  // namespace api
 
 }  // namespace atom

docs/api/native-image.md

@@ -131,3 +131,9 @@ Returns whether the image is empty.
 Returns the size of the image.
 
 [buffer]: https://iojs.org/api/buffer.html#buffer_class_buffer
+
+### NativeImage.setTemplateImage(option)
+
+* `option` Boolean
+
+To toggle a `NativeImage` as Template image on OSX