Make ImageLoadingTracker load bundled image on UI thread.
Make ImageLoadingTracker load bundled image on UI thread.

There are two possible threading check failures in ILT::LoadResource:
1. The same resource is accessed in parallel in different threads of the
   blocking pool;
2. A resource is first accessed on UI thread somewhere else then ILT
   accesses it from a blocking pool thread;

Calling ResourceBundle::GetImageSkiaNamed and ImageSkia::MakeThreadSafe on the
UI thread should address both cases.

BUG=153460
TEST=Verify no crash on starting chrome with pinned "Web Store" or "File".

R=oshima@chromium.org,aa@chromium.org,yoz@chromium.org


Review URL: https://chromiumcodereview.appspot.com/11038042

git-svn-id: de016e52bd170d2d4f2344f9bf92d50478b649e0@160533 0039d316-1c4b-4281-b951-d872f2087c98

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