d3d11: Add a histogram to capture DLL loading time.
d3d11: Add a histogram to capture DLL loading time.

This should complete the breakdown of the time we spent in
eglInitialize.

BUG=angleproject:1014
BUG=436191

Change-Id: I3b44f10c56322924f9391a56973df5f439fa83bb
Reviewed-on: https://chromium-review.googlesource.com/276268
Tested-by: Jamie Madill <7e492b4f1c8458024932de3ba475cbf015424c30@chromium.org>
Reviewed-by: Geoff Lang <b6fc25fe0362055230985c05cbfa8adb741ccc0f@chromium.org>

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