Fix a race in DatabaseManager::manager.

Fix a race in DatabaseManager::manager.

DatabaseManager::manager should return a singleton of DatabaseManager. However
it had no mutex. It was possible to create two DatabaseManager.

BUG=378250
NOTRY=true

Committed: https://src.chromium.org/viewvc/blink?view=rev&revision=175057

[eseidel, 2014-05-29 07:03:37]

lgtm

https://codereview.chromium.org/308593004/diff/20001/Source/modules/webdataba...
File Source/modules/webdatabase/DatabaseManager.cpp (right):

https://codereview.chromium.org/308593004/diff/20001/Source/modules/webdataba...
Source/modules/webdatabase/DatabaseManager.cpp:52:
AtomicallyInitializedStatic(DatabaseManager*, dbManager = new DatabaseManager);
I didn't know this existed, crazy.

https://code.google.com/p/chromium/codesearch#chromium/src/third_party/WebKit...

[haraken, 2014-05-29 07:05:01]

LGTM

[tkent, 2014-05-29 07:36:55]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-05-29 07:37:25]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tkent@chromium.org/308593004/20001

[commit-bot: I haz the power, 2014-05-29 08:10:21]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  linux_blink_dbg on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_dbg/builds/1...)
  linux_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/linux_blink_rel/builds/9923)

[tkent, 2014-05-29 12:35:50]

The CQ bit was unchecked by tkent@chromium.org

[tkent, 2014-05-29 12:35:58]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-05-29 12:36:15]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tkent@chromium.org/308593004/20001

[tkent, 2014-05-29 14:15:09]

The CQ bit was unchecked by tkent@chromium.org

[tkent, 2014-05-29 14:15:17]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-05-29 14:15:55]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tkent@chromium.org/308593004/20001

[commit-bot: I haz the power, 2014-05-29 14:43:19]

FYI, CQ is re-trying this CL (attempt #1).
The failing builders are:
  win_blink_rel on tryserver.blink
(http://build.chromium.org/p/tryserver.blink/builders/win_blink_rel/builds/9689)

[tkent, 2014-05-29 14:45:10]

The CQ bit was unchecked by tkent@chromium.org

[tkent, 2014-05-29 14:45:21]

The CQ bit was checked by tkent@chromium.org

[commit-bot: I haz the power, 2014-05-29 14:46:19]

CQ is trying da patch. Follow status at
 https://chromium-status.appspot.com/cq/tkent@chromium.org/308593004/20001

[commit-bot: I haz the power, 2014-05-29 14:47:10]

Change committed as 175057