Add flag to disable mmap in all sql connection in work build

Work Chrome runs in environment without a proper mmap support.
Disable it for all work chrome.

BUG=554269

Review URL: https://codereview.chromium.org/1637683003

Cr-Commit-Position: refs/heads/master@{#372179}

2 files changed, 13 insertions, 2 deletions

diff --git a/sql/connection.cc b/sql/connection.cc
index 003005a..f08560c 100644
--- a/sql/connection.cc
+++ b/sql/connection.cc
@@ -43,6 +43,8 @@ namespace {
 // TODO(shess): Better story on this.  http://crbug.com/56559
 const int kBusyTimeoutSeconds = 1;
 
+bool g_mmap_disabled_default = false;
+
 class ScopedBusyTimeout {
  public:
   explicit ScopedBusyTimeout(sqlite3* db)
@@ -254,6 +256,12 @@ bool Connection::ShouldIgnoreSqliteCompileError(int error) {
       basic_error == SQLITE_CORRUPT;
 }
 
+// static
+void Connection::set_mmap_disabled_by_default() {
+    g_mmap_disabled_default = true;
+}
+
+
 void Connection::ReportDiagnosticInfo(int extended_error, Statement* stmt) {
   AssertIOAllowed();
 
@@ -339,7 +347,7 @@ Connection::Connection()
       needs_rollback_(false),
       in_memory_(false),
       poisoned_(false),
-      mmap_disabled_(false),
+      mmap_disabled_(g_mmap_disabled_default),
       mmap_enabled_(false),
       total_changes_at_last_release_(0),
       stats_histogram_(NULL),
diff --git a/sql/connection.h b/sql/connection.h
index b35e2fa..4606a1f 100644
--- a/sql/connection.h
+++ b/sql/connection.h
@@ -149,9 +149,12 @@ class SQL_EXPORT Connection {
   // other platforms.
   void set_restrict_to_user() { restrict_to_user_ = true; }
 
-  // Call to opt out of memory-mapped file I/O.
+  // Call to opt out of memory-mapped file I/O on per connection basis.
   void set_mmap_disabled() { mmap_disabled_ = true; }
 
+  // Call to opt out of memory-mapped file I/O on all connections.
+  static void set_mmap_disabled_by_default();
+
   // Set an error-handling callback.  On errors, the error number (and
   // statement, if available) will be passed to the callback.
   //