Offer user to send feedback from profile error dialog

components/history/core/browser/history_backend.h

Index: components/history/core/browser/history_backend.h
diff --git a/components/history/core/browser/history_backend.h b/components/history/core/browser/history_backend.h
index 0b952b4b4b8ac365694ec5fb0558123917c14526..a934d600a639b88142947df1fe9dc10538007cee 100644
--- a/components/history/core/browser/history_backend.h
+++ b/components/history/core/browser/history_backend.h
@@ -32,6 +32,7 @@
 #include "components/history/core/browser/keyword_id.h"
 #include "components/history/core/browser/thumbnail_database.h"
 #include "components/history/core/browser/visit_tracker.h"
+#include "sql/db_diagnostic_map.h"
 #include "sql/init_status.h"
 
 class HistoryURLProvider;
@@ -113,7 +114,9 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
     virtual ~Delegate() {}
 
     // Called when the database cannot be read correctly for some reason.
-    virtual void NotifyProfileError(sql::InitStatus init_status) = 0;
+    virtual void NotifyProfileError(
+        sql::InitStatus init_status,
+        const sql::DatabaseDiagnosticMap& diagnostics) = 0;
 
     // Sets the in-memory history backend. The in-memory backend is created by
     // the main backend. For non-unit tests, this happens on the background
@@ -824,6 +827,9 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   bool scheduled_kill_db_;  // Database is being killed due to error.
   std::unique_ptr<ThumbnailDatabase> thumbnail_db_;
 
+  // Invoked when an error occurs on the database connection.
+  sql::Connection::ErrorCallback error_callback_;
+
   // Manages expiration between the various databases.
   ExpireHistoryBackend expirer_;
 
@@ -879,6 +885,10 @@ class HistoryBackend : public base::RefCountedThreadSafe<HistoryBackend>,
   // Listens for the system being under memory pressure.
   std::unique_ptr<base::MemoryPressureListener> memory_pressure_listener_;
 
+  // Contains diagnostic information about the sql database that will be filled
+  // when a catastrophic error occurs.
+  sql::DatabaseDiagnosticMap db_diagnostics_;
+
   // Map from host to index in the TopHosts list. It is updated only by
   // TopHosts(), so it's usually stale.
   mutable base::hash_map<std::string, int> host_ranks_;