Migrate the IndexedDB backend from Blink to Chromium

To get the IDB backend off the (deprecated) WebKit thread, remove
intermediate proxying, and let us take advantage of base utilities,
we're moving the code from Blink to Chromium.

This patch is basically a glorified copy/paste of the Blink IDB
backend code, with Chromium coding style applied, WTF dependencies
replaced with STL and base/, redundant classes removed, etc. It
introduces some new temporary proxy classes
(content/browser/webidb*_impl.*) to allow us build both the old and
new backends.

The new backend is currently disabled by default. It can be enabled
using a new (and temporary) command line switch: --new-indexeddb Once
we've done some further cleanup and are confident that the new backend
is stable, and the bots have moved from DumpRenderTree to
content_shell, we'll switch to the new backend by default. Once that
has survived through a dev channel release, we'll delete the Blink
code and eliminate unnecessary proxy classes.

BUG=234278
R=alecflett@chromium.org, dgrogan@chromium.org, piman@chromium.org

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=202215

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=202604

Committed: https://src.chromium.org/viewvc/chrome?view=rev&revision=203164

Review URL: https://codereview.chromium.org/15564008

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@203257 0039d316-1c4b-4281-b951-d872f2087c98

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