Avoid data race on Database::m_opened.

third_party/WebKit/Source/modules/webdatabase/Database.cpp

Index: third_party/WebKit/Source/modules/webdatabase/Database.cpp
diff --git a/third_party/WebKit/Source/modules/webdatabase/Database.cpp b/third_party/WebKit/Source/modules/webdatabase/Database.cpp
index 49172e398407040128481fd2e1554d7e8fd9f28a..7074cbd62480c5fa4b9571728eaf71b3486581fb 100644
--- a/third_party/WebKit/Source/modules/webdatabase/Database.cpp
+++ b/third_party/WebKit/Source/modules/webdatabase/Database.cpp
@@ -53,6 +53,7 @@
 #include "platform/weborigin/DatabaseIdentifier.h"
 #include "public/platform/Platform.h"
 #include "public/platform/WebDatabaseObserver.h"
+#include "wtf/Atomics.h"
 
 // Registering "opened" databases with the DatabaseTracker
 // =======================================================
@@ -208,7 +209,7 @@ Database::Database(DatabaseContext* databaseContext, const String& name, const S
     , m_displayName(displayName.isolatedCopy())
     , m_estimatedSize(estimatedSize)
     , m_guid(0)
-    , m_opened(false)
+    , m_opened(0)
     , m_new(false)
     , m_transactionInProgress(false)
     , m_isTransactionQueueEnabled(true)
@@ -369,8 +370,8 @@ void Database::closeDatabase()
     if (!m_opened)
         return;
 
+    releaseStore(&m_opened, 0);
     m_sqliteDatabase.close();
-    m_opened = false;
     // See comment at the top this file regarding calling removeOpenDatabase().
     DatabaseTracker::tracker().removeOpenDatabase(this);
     {
@@ -530,7 +531,7 @@ bool Database::performOpenAndVerify(bool shouldSetVersionInNewDatabase, Database
 
     // See comment at the top this file regarding calling addOpenDatabase().
     DatabaseTracker::tracker().addOpenDatabase(this);
-    m_opened = true;
+    m_opened = 1;
 
     // Declare success:
     error = DatabaseError::None; // Clear the presumed error from above.
@@ -901,4 +902,9 @@ SecurityOrigin* Database::securityOrigin() const
     return 0;
 }
 
+bool Database::opened()
+{
+    return static_cast<bool>(acquireLoad(&m_opened));
+}
+
 } // namespace blink