New Tab Page: Work around potentially long delays if model is not loaded.

New Tab Page: Work around potentially long delays if model is not loaded.

This avoids querying for offline pages if the model is not loaded, so
that the maximum possible delay is minimal (once the model is loaded,
all pages are stored in memory).

Additionally checks for null when obtaining the offline page model.

BUG=607573, 613359
Review-Url: https://codereview.chromium.org/1982483002
Cr-Commit-Position: refs/heads/master@{#395096}
(cherry picked from commit 9a12ce07eb8c36407ae27beba7b2082229cf5678)

Committed: https://chromium.googlesource.com/chromium/src/+/fac0bea283906de6dffd7e9fe7af6ba5872949fe

[dewittj, 2016-05-24 17:59:24]

Description was changed from

==========
New Tab Page: Work around potentially long delays if model is not loaded.

This avoids querying for offline pages if the model is not loaded, so
that the maximum possible delay is minimal (once the model is loaded,
all pages are stored in memory).

Additionally checks for null when obtaining the offline page model.

BUG=607573,613359

Review-Url: https://codereview.chromium.org/1982483002
Cr-Commit-Position: refs/heads/master@{#395096}
(cherry picked from commit 9a12ce07eb8c36407ae27beba7b2082229cf5678)
==========

to

==========
New Tab Page: Work around potentially long delays if model is not loaded.

This avoids querying for offline pages if the model is not loaded, so
that the maximum possible delay is minimal (once the model is loaded,
all pages are stored in memory).

Additionally checks for null when obtaining the offline page model.

BUG=607573,613359

Review-Url: https://codereview.chromium.org/1982483002
Cr-Commit-Position: refs/heads/master@{#395096}
(cherry picked from commit 9a12ce07eb8c36407ae27beba7b2082229cf5678)

Committed:
https://chromium.googlesource.com/chromium/src/+/fac0bea283906de6dffd7e9fe7af...
==========

[dewittj, 2016-05-24 17:59:26]

Committed patchset #1 (id:1) manually as
fac0bea283906de6dffd7e9fe7af6ba5872949fe.