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This CL adds helper functions to load DevUI DFM native resources.
* Add enum chrome::FILE_DEV_UI_RESOURCES_PACK to specify path for
  "dev_ui_resources.pak" on Android.
* Add LoadAndroidDevUiPackFile().
  * Adds another {file descriptor, memory mapped file regions} global
    variable in resource_bundle_android.h. All these will be cleaned up
    in the future.
* Add LoadDevUiResources() (in new file) as the main function to call
  to load DevUI DFM resources (hidden behind DFMIFY_DEV_UI).
  * There's no need for a function to return the file descriptor of
    "dev_ui_resources.pak", because we do not intend to forward it to
    child processes.

Bug: 927131
Change-Id: I0c4e42e33b959d0a022f1287748573ebaf79c685
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1769218Reviewed-by: Nico Weber <thakis@chromium.org>
Reviewed-by: Samuel Huang <huangs@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Samuel Huang <huangs@chromium.org>
Cr-Commit-Position: refs/heads/master@{#691672}