[Sync] Implement MemoryDumpProvider.

sql/connection.h

Index: sql/connection.h
diff --git a/sql/connection.h b/sql/connection.h
index 0fb251dd8cc701b5f6a976f7a5851e3baa1549d6..20ea3cd5101b199f20be8c143403bec9fd42f3dd 100644
--- a/sql/connection.h
+++ b/sql/connection.h
@@ -28,6 +28,9 @@ struct sqlite3_stmt;
 namespace base {
 class FilePath;
 class HistogramBase;
+namespace trace_event {
+class MemoryAllocatorDump;
+}
 }
 
 namespace sql {
@@ -251,6 +254,9 @@ class SQL_EXPORT Connection {
   // get diagnostic information about the database.
   std::string GetDiagnosticInfo(int extended_error, Statement* statement);
 
+  // Reports memory usage into provided memory dump.
+  bool ReportMemoryUsage(base::trace_event::MemoryAllocatorDump* mad);
+
   // Initialization ------------------------------------------------------------
 
   // Initializes the SQL connection for the given file, returning true if the