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partition_alloc.h has been a dumping ground for all objects related to
PartitonAlloc. The original code used many inlined top-level functions
making the implementation very coupled. This splits out most of the
critical clusters of functionality into separate files with roughly
one struct/class per file.

The split makes the module layering and interaction boundaries much clearer.
Because of the heavy use of inlining, and the highly coupled nature of the
original code, it was not possible to make a clean split yet between
declaration and implementation. Therefore, this splitting required introducing
"-inl.h" files because too many of these objects reached direclty into each
others's fields. These "-inl.h" files can likely be reduced in future
refactors.

Bug: 766882
Change-Id: Iceeccc64a1d810a68cedfb28599dfbcf66642b98
Reviewed-on: https://chromium-review.googlesource.com/1006154Reviewed-by: Daniel Cheng <dcheng@chromium.org>
Reviewed-by: Kentaro Hara <haraken@chromium.org>
Reviewed-by: Chris Palmer <palmer@chromium.org>
Cr-Commit-Position: refs/heads/master@{#555118}