UMA for Windows 8 Secondary Tile pinning/unpinning user actions

base/win/metro.h

Index: base/win/metro.h
diff --git a/base/win/metro.h b/base/win/metro.h
index a43bbc31b23afd439526022816441ac691419ced..9354de83bb0f225ac4203a7de2514eff88d14d07 100644
--- a/base/win/metro.h
+++ b/base/win/metro.h
@@ -9,6 +9,8 @@
 #include <wpcapi.h>
 
 #include "base/base_export.h"
+#include "base/callback.h"
+#include "base/file_path.h"
 #include "base/string16.h"
 
 namespace base {
@@ -36,6 +38,26 @@ enum MetroPreviousExecutionState {
   LASTEXECUTIONSTATE,
 };
 
+// Enum values for UMA histogram reporting of site-specific tile pinning.
+// TODO(tapted): Move this to win8/util when ready (http://crbug.com/160288).
+enum MetroSecondaryTilePinUmaResult {
+  METRO_PIN_STATE_NONE,
+  METRO_PIN_INITIATED,
+  METRO_PIN_LOGO_READY,
+  METRO_PIN_REQUEST_SHOW_ERROR,
+  METRO_PIN_RESULT_CANCEL,
+  METRO_PIN_RESULT_OK,
+  METRO_PIN_RESULT_OTHER,
+  METRO_PIN_RESULT_ERROR,
+  METRO_UNPIN_INITIATED,
+  METRO_UNPIN_REQUEST_SHOW_ERROR,
+  METRO_UNPIN_RESULT_CANCEL,
+  METRO_UNPIN_RESULT_OK,
+  METRO_UNPIN_RESULT_OTHER,
+  METRO_UNPIN_RESULT_ERROR,
+  METRO_PIN_STATE_LIMIT
+};
+
 // Contains information about the currently displayed tab in metro mode.
 struct CurrentTabInfo {
   wchar_t* title;
@@ -97,6 +119,23 @@ typedef void (*MetroNotification)(const char* origin_url,
                                   MetroNotificationClickedHandler handler,
                                   const wchar_t* handler_context);
 
+// Callback for UMA invoked by Metro Pin and UnPin functions after user gesture.
+typedef base::Callback<void(MetroSecondaryTilePinUmaResult)>
+    MetroPinUmaResultCallback;
+
+// Function to pin a site-specific tile (bookmark) to the start screen.
+typedef void (*MetroPinToStartScreen)(
+    const string16& tile_id,
+    const string16& title,
+    const string16& url,
+    const FilePath& logo_path,
+    const MetroPinUmaResultCallback& callback);
+
+// Function to un-pin a site-specific tile (bookmark) from the start screen.
+typedef void (*MetroUnPinFromStartScreen)(
+    const string16& title_id,
+    const MetroPinUmaResultCallback& callback);
+
 }  // namespace win
 }  // namespace base