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This adds a small executable, libcrashpad_handler_trampoline.so, to
Monochrome, Trichrome, and SystemWebView. The trampoline loads the
remaining Crashpad handler code from the main native library, which
must export `CrashpadHandlerMain()`.

All three packages will continue to use /system/bin/app_process to
launch Crashpad on P-.

Note on static_initializers.gni:

There aren't any real, new static initializers. The increased count is
due to the addition of the new object. Static initializers are counted
by measuring the size of each object's .init_array and dividing by the
object's pointer size. libcrashpad_handler_trampoline.so has two
invalid slots which are ignored by the loader:

readelf -x .init_array libcrashpad_handler_trampoline.so

Hex dump of section '.init_array':
  0x00001008 ffffffff 00000000

Bug: 928422
Change-Id: Iba56cd6feda73ebc91f6758724d823e48b5c6e8f
Reviewed-on: https://chromium-review.googlesource.com/c/1454078Reviewed-by: Richard Coles <torne@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Reviewed-by: Andrew Grieve <agrieve@chromium.org>
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Cr-Commit-Position: refs/heads/master@{#635269}