[protector] Homepage UI.

chrome/browser/protector/histograms.h

Index: chrome/browser/protector/histograms.h
diff --git a/chrome/browser/protector/histograms.h b/chrome/browser/protector/histograms.h
index 7ffc50c07972f56769205bc316433685541694c7..e2cfedef99f0cae400147fe2c4bfc1b92305a910 100644
--- a/chrome/browser/protector/histograms.h
+++ b/chrome/browser/protector/histograms.h
@@ -61,6 +61,16 @@ extern const char kProtectorHistogramStartupSettingsDiscarded[];
 // Histogram name to report when user ignores startup settings change.
 extern const char kProtectorHistogramStartupSettingsTimeout[];
 
+// Histogram name to report when user accepts new homepage.
+extern const char kProtectorHistogramHomepageApplied[];
+// Histogram name to report the new homepage when the backup is valid and a
+// change is detected.
+extern const char kProtectorHistogramHomepageChanged[];
+// Histogram name to report when user keeps previous homepage.
+extern const char kProtectorHistogramHomepageDiscarded[];
+// Histogram name to report when user ignores homepage change.
+extern const char kProtectorHistogramHomepageTimeout[];
+
 // Maximum value of search provider index in histogram enums.
 extern const int kProtectorMaxSearchProviderID;