[Win, MediaGallery] Enumerate and handle mtp device attach/detach events.

chrome/browser/system_monitor/removable_device_constants.h

Index: chrome/browser/system_monitor/removable_device_constants.h
diff --git a/chrome/browser/system_monitor/removable_device_constants.h b/chrome/browser/system_monitor/removable_device_constants.h
index 1b62c0532dcc9b42483c538dee61bbf2ff51e6c2..7be9b098bff7547174ebc45954202997d3952fb0 100644
--- a/chrome/browser/system_monitor/removable_device_constants.h
+++ b/chrome/browser/system_monitor/removable_device_constants.h
@@ -6,6 +6,7 @@
 #define CHROME_BROWSER_SYSTEM_MONITOR_REMOVABLE_DEVICE_CONSTANTS_H_
 
 #include "build/build_config.h"
+#include "base/string16.h"
 
 namespace chrome {
 
@@ -13,6 +14,10 @@ namespace chrome {
 extern const char kFSUniqueIdPrefix[];
 extern const char kVendorModelSerialPrefix[];
 
+// Delimiter constants used in device label and unique id.
+extern const char kNonSpaceDelim[];
+extern const char kSpaceDelim[];
+
 #if defined(OS_LINUX)
 // Delimiter constants used in device label to specify data storage id.
 extern const char kLeftParen[];
@@ -21,9 +26,13 @@ extern const char kRightParen[];
 extern const char kVendorModelVolumeStoragePrefix[];
 #endif
 
-// Delimiter constants used in device label and unique id.
-extern const char kNonSpaceDelim[];
-extern const char kSpaceDelim[];
+#if defined(OS_WIN)
+// Delimiter constant used in mtp device storage unique id.
+extern const char16 kMtpDeviceStorageIdPrefix[];
+
+// Windows portable device interface GUID constant.
+extern const char16 kWPDDevInterfaceGUID[];
+#endif
 
 }  // namespace chrome