Define the Settings interface for a CrashReportDatabase and provide a Mac implementation.

client/crash_report_database.h

Index: client/crash_report_database.h
diff --git a/client/crash_report_database.h b/client/crash_report_database.h
index a266b212f962575835183942de8a2338b2cb54e4..a7e2c2000623238680a0c4840f3ee58666b70bb4 100644
--- a/client/crash_report_database.h
+++ b/client/crash_report_database.h
@@ -28,6 +28,8 @@
 
 namespace crashpad {
 
+class Settings;
+
 //! \brief An interface for managing a collection of crash report files and
 //!     metadata associated with the crash reports.
 //!
@@ -141,6 +143,12 @@ class CrashReportDatabase {
   //!     logged.
   static scoped_ptr<CrashReportDatabase> Initialize(const base::FilePath& path);
 
+  //! \brief Returns the Settings object for this database.
+  //!
+  //! \return A weak pointer to the Settings object, which is owned by the
+  //!     database.
+  virtual Settings* GetSettings() = 0;
+
   //! \brief Creates a record of a new crash report.
   //!
   //! Callers can then write the crash report using the file handle provided.