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Introduce a SystemUIResourceManager class for loading and providing access to
shared UIResourceId's.  Wire this class to the existing OverscrollGlow effect,
using the shared id's with a UIResourceLayer for both glow and edge layers.

This patch is a subset of powei@'s original SystemUIResource patch found at
https://codereview.chromium.org/377013002/.

BUG=326326

Review URL: https://codereview.chromium.org/422013003

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@288095 0039d316-1c4b-4281-b951-d872f2087c98