Add MEDIA_EXPORT for MacDesktopConfiguration::GetCurrent() to fix build break after r179218.

media/video/capture/screen/mac/desktop_configuration.h

Index: media/video/capture/screen/mac/desktop_configuration.h
diff --git a/media/video/capture/screen/mac/desktop_configuration.h b/media/video/capture/screen/mac/desktop_configuration.h
index 998f9181b0309e5fa0d1626de984cfae5aca6213..c3c65b39be54a5d7daf613ad0a8f738e7275beb4 100644
--- a/media/video/capture/screen/mac/desktop_configuration.h
+++ b/media/video/capture/screen/mac/desktop_configuration.h
@@ -10,17 +10,19 @@
 #include <vector>
 
 #include "base/basictypes.h"
+#include "media/base/media_export.h"
 #include "third_party/skia/include/core/SkPoint.h"
 #include "third_party/skia/include/core/SkRect.h"
 
 namespace media {
 
 // Describes the configuration of a specific display.
-struct MacDisplayConfiguration {
+struct MEDIA_EXPORT MacDisplayConfiguration {
   MacDisplayConfiguration();
 
   // Returns the current configuration of the specified display.
-  static MacDisplayConfiguration ForDisplay(CGDirectDisplayID display_id);
+  MEDIA_EXPORT static MacDisplayConfiguration ForDisplay(
+      CGDirectDisplayID display_id);
 
   // Cocoa identifier for this display.
   CGDirectDisplayID id;
@@ -38,12 +40,12 @@ struct MacDisplayConfiguration {
 typedef std::vector<MacDisplayConfiguration> MacDisplayConfigurations;
 
 // Describes the configuration of the whole desktop.
-struct MacDesktopConfiguration {
+struct MEDIA_EXPORT MacDesktopConfiguration {
   MacDesktopConfiguration();
   ~MacDesktopConfiguration();
 
   // Returns the current configuration of the desktop.
-  static MacDesktopConfiguration GetCurrent();
+  MEDIA_EXPORT static MacDesktopConfiguration GetCurrent();
 
   // Bounds of the desktop in Density-Independent Pixels (DIPs).
   SkIRect bounds;