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This CL updates the open source implementation of the side menu so that
it also shows items from SideMenuItemsProvider. This make it easier for
developer to debug CRD for iOS on Chromium without checking out
ios_internal.

Bug: 786625
Change-Id: I784032e905cfdd78eeef122f302f464b443d2153
Reviewed-on: https://chromium-review.googlesource.com/780151Reviewed-by: Jamie Walch <jamiewalch@chromium.org>
Commit-Queue: Yuwei Huang <yuweih@chromium.org>
Cr-Commit-Position: refs/heads/master@{#519859}