Make hasCookieStoreLoaded visible for testing

Make hasCookieStoreLoaded visible for testing

We need to start using this method for testing purposes downstream
but without the annotations it is getting stripped our by proguard.

BUG=372774
Committed: https://crrev.com/67d86f63228f12ecd59762ef44c190c51a37823d
Cr-Commit-Position: refs/heads/master@{#297867}

[Yusuf, 2014-10-01 20:00:52]

yusufo@chromium.org changed reviewers:
+ dtrainor@chromium.org

[David Trainor- moved to gerrit, 2014-10-01 23:15:50]

lgtm

https://chromiumcodereview.appspot.com/615843004/diff/20001/chrome/android/ja...
File
chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java
(right):

https://chromiumcodereview.appspot.com/615843004/diff/20001/chrome/android/ja...
chrome/android/java/src/org/chromium/chrome/browser/prerender/ExternalPrerenderHandler.java:43:
public static boolean checkCookieStoreLoadedForTesting(Profile profile)  {
javadoc

[Yusuf, 2014-10-01 23:28:17]

The CQ bit was checked by yusufo@chromium.org

[commit-bot: I haz the power, 2014-10-01 23:29:24]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615843004/40001

[commit-bot: I haz the power, 2014-10-01 23:54:19]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2014-10-01 23:54:20]

Try jobs failed on following builders:
  android_arm64_dbg_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_arm64_d...)
  android_dbg_tests_recipe on tryserver.chromium.linux
(http://build.chromium.org/p/tryserver.chromium.linux/builders/android_dbg_tes...)

[Yusuf, 2014-10-02 17:31:22]

The CQ bit was checked by yusufo@chromium.org

[commit-bot: I haz the power, 2014-10-02 17:32:40]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615843004/60001

[Yusuf, 2014-10-02 17:57:12]

The CQ bit was checked by yusufo@chromium.org

[commit-bot: I haz the power, 2014-10-02 17:57:31]

CQ is trying da patch. Follow status at
 https://chromium-cq-status.appspot.com/patch-status/615843004/80001

[commit-bot: I haz the power, 2014-10-02 18:28:53]

Committed patchset #5 (id:80001) as 5ee2fe78103f8180d73a881a565d07cc19f1a791

[commit-bot: I haz the power, 2014-10-02 18:29:33]

Patchset 5 (id:??) landed as
https://crrev.com/67d86f63228f12ecd59762ef44c190c51a37823d
Cr-Commit-Position: refs/heads/master@{#297867}