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As preparation for NativeUnwinderAndroid, ModuleCache needs to support adding
native modules.
This CL
- adds ModuleCache::AddCustomNativeModule.
- Renames Unwinder::AddNonNativeModule to Unwinder::AddInitialModules
- Turns android ChromeModule to a native module

Follow-up: https://chromium-review.googlesource.com/c/chromium/src/+/2055743

Bug: 989102
Change-Id: I5f2319e999f04e76de96702f811b3bfa50f5b17e
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2080776Reviewed-by: Avi Drissman <avi@chromium.org>
Reviewed-by: Mike Wittman <wittman@chromium.org>
Commit-Queue: Etienne Pierre-Doray <etiennep@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746909}