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

client/crash_report_database_mac.mm

Index: client/crash_report_database_mac.mm
diff --git a/client/crash_report_database_mac.mm b/client/crash_report_database_mac.mm
index eeb203eaef39d43330dcdde6ecbee2609a287ce0..247e5443ab8a7b5e91873fcdb73e04c9becaf8ad 100644
--- a/client/crash_report_database_mac.mm
+++ b/client/crash_report_database_mac.mm
@@ -29,6 +29,7 @@
 #include "base/strings/string_piece.h"
 #include "base/strings/stringprintf.h"
 #include "base/strings/sys_string_conversions.h"
+#include "client/settings_mac.h"
 #include "util/file/file_io.h"
 #include "util/mac/xattr.h"
 
@@ -42,6 +43,8 @@ const char kWriteDirectory[] = "new";
 const char kUploadPendingDirectory[] = "pending";
 const char kCompletedDirectory[] = "completed";
 
+const char kSettings[] = "settings.plist";
+
 const char* const kReportDirectories[] = {
   kWriteDirectory,
   kUploadPendingDirectory,
@@ -106,6 +109,7 @@ class CrashReportDatabaseMac : public CrashReportDatabase {
   bool Initialize();
 
   // CrashReportDatabase:
+  Settings* GetSettings() override;
   OperationStatus PrepareNewCrashReport(NewReport** report) override;
   OperationStatus FinishedWritingCrashReport(NewReport* report,
                                              UUID* uuid) override;
@@ -186,12 +190,15 @@ class CrashReportDatabaseMac : public CrashReportDatabase {
   static std::string XattrName(const base::StringPiece& name);
 
   base::FilePath base_dir_;
+  internal::SettingsMac settings_;
 
   DISALLOW_COPY_AND_ASSIGN(CrashReportDatabaseMac);
 };
 
 CrashReportDatabaseMac::CrashReportDatabaseMac(const base::FilePath& path)
-    : CrashReportDatabase(), base_dir_(path) {
+    : CrashReportDatabase(),
+      base_dir_(path),
+      settings_(base_dir_.Append(kSettings)) {
 }
 
 CrashReportDatabaseMac::~CrashReportDatabaseMac() {}
@@ -207,11 +214,18 @@ bool CrashReportDatabaseMac::Initialize() {
       return false;
   }
 
+  if (!settings_.Initialize())
+    return false;
+
   // Write an xattr as the last step, to ensure the filesystem has support for
   // them. This attribute will never be read.
   return WriteXattrBool(base_dir_, XattrName(kXattrDatabaseInitialized), true);
 }
 
+Settings* CrashReportDatabaseMac::GetSettings() {
+  return &settings_;
+}
+
 CrashReportDatabase::OperationStatus
 CrashReportDatabaseMac::PrepareNewCrashReport(NewReport** out_report) {
   uuid_t uuid_gen;