Settings reset prompt: add UMA metrics reporting.

chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.h

Index: chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.h
diff --git a/chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.h b/chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.h
index 31a7afeaed61215e490a475e10f01c54ca33ce98..a79a081d04a3af4296c100454c5db3de17ba22ef 100644
--- a/chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.h
+++ b/chrome/browser/safe_browsing/settings_reset_prompt/settings_reset_prompt_controller.h
@@ -10,6 +10,7 @@
 
 #include "base/macros.h"
 #include "base/strings/string16.h"
+#include "base/time/time.h"
 #include "ui/gfx/range/range.h"
 
 class Browser;
@@ -63,6 +64,9 @@ class SettingsResetPromptController {
   base::string16 main_text_;
   gfx::Range main_text_url_range_;
 
+  // Used for metrics reporting.
+  base::Time time_dialog_shown_;
+
   DISALLOW_COPY_AND_ASSIGN(SettingsResetPromptController);
 };