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Before mojofication on Hid, we have to add typemapping for HidDeviceId first.
HidDeviceId is defined as uint64_t on MacOS while as string on other
platforms.

In this CL, we rename the original HidDeviceId to HidPlatformDeviceId, and
define the new HidDeviceId type as uint64_t. we map the PlatformHidDeviceId
to HidDeviceId. 

All clients of HidService should hold the new HidDeviceId instead of the
PlatformHidDeviceId.

BUG=728223

Change-Id: I3585c9eb0eacb02571258314c14e063adce653fc
Reviewed-on: https://chromium-review.googlesource.com/570201Reviewed-by: Reilly Grant <reillyg@chromium.org>
Commit-Queue: Ke He <ke.he@intel.com>
Cr-Commit-Position: refs/heads/master@{#488837}