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RasterWorkerPool class has a lot of implementation specific details
that the tile manager and the delegate should not be affected by.
Moving implementation specific parts into a separate class and file
makes it clear what is part of the interface used by the tile
manager and what are details of the implementation. ie. changes to
implementation specific files alone should not affect or require
changes to the tile manager.

BUG=269841

Review URL: https://codereview.chromium.org/228173002

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@263120 0039d316-1c4b-4281-b951-d872f2087c98