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This is an experimental tool which will inject a thread into a Chrome
process (tested on the browser and GPU process) and run code to call
HeapSetInformation with HEAP_OPTIMIZE_RESOURCES_CURRENT_VERSION. This
tells Windows to trim unnecessary memory from the heaps in that process.

This tool uses sketchy techniques such as copying memory from one
executable to another (only works if the code is relocatable and has no
external references), VirtualAllocEx, and CreateRemoteThread. This is
not for production use.

To build run build.bat
To run either run it manually (passing the PIDs of the processes of
interest) or run trim_loop.bat (passing the PIDs of the processes of
interest) to run it every five minutes in a loop.

While it sometimes frees non-trivial amounts of memory the savings are
not persistent.

Bug: 1050059, 982452
Change-Id: I646c515e59598c2c3003500419c154bacd34aeda
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2139127
Commit-Queue: Bruce Dawson <brucedawson@chromium.org>
Reviewed-by: David Bienvenu <davidbienvenu@google.com>
Reviewed-by: Jesse McKenna <jessemckenna@google.com>
Reviewed-by: James Forshaw <forshaw@chromium.org>
Cr-Commit-Position: refs/heads/master@{#757644}