Implement Desktop Media Picker (Mac version) for Desktop Capture API

chrome/browser/extensions/api/desktop_capture/desktop_capture_api.cc

Index: chrome/browser/extensions/api/desktop_capture/desktop_capture_api.cc
diff --git a/chrome/browser/extensions/api/desktop_capture/desktop_capture_api.cc b/chrome/browser/extensions/api/desktop_capture/desktop_capture_api.cc
index 066bc0540925a68a9bff52766889b898f3ac1e7d..8f2877cadc34a2e62309346d01791cded428f20c 100644
--- a/chrome/browser/extensions/api/desktop_capture/desktop_capture_api.cc
+++ b/chrome/browser/extensions/api/desktop_capture/desktop_capture_api.cc
@@ -4,6 +4,7 @@
 
 #include "chrome/browser/extensions/api/desktop_capture/desktop_capture_api.h"
 
+#include "base/compiler_specific.h"
 #include "base/strings/utf_string_conversions.h"
 #include "chrome/browser/media/desktop_streams_registry.h"
 #include "chrome/browser/media/media_capture_devices_dispatcher.h"
@@ -87,9 +88,8 @@ bool DesktopCaptureChooseDesktopMediaFunction::RunImpl() {
         screen_capturer.Pass(), window_capturer.Pass());
     picker_ = g_picker_factory->CreatePicker();
   } else {
-    // Currently DesktopMediaPicker is implemented only for platforms that
-    // use Views.
-#if defined(TOOLKIT_VIEWS)
+    // DesktopMediaPicker is not implented for all platforms yet.
+#if defined(TOOLKIT_VIEWS) || defined(OS_MACOSX)
     model.reset(new DesktopMediaPickerModelImpl(
         screen_capturer.Pass(), window_capturer.Pass()));
     picker_ = DesktopMediaPicker::Create();