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This is a reland of dbca191e

Original change's description:
> Package Crashpad's handler into various APKs
>
> For Chromecast, Content Shell, and non-monochrome Clank/Webview:
>
> The Crashpad handler is a standalone executable, packaged like a
> loadable module and named libcrashpad_handler.so in order to not be
> ignored by Android's APK installer.
>
> For Monochrome:
>
> The Crashpad handler is linked into libmonochrome.so. At crash-time
> /system/bin/app_process{32,64} is exec-ed, running CrashpadMain.java
> which loads libmonochrome.so and runs the native HandlerMain().
>
> This strategy is not used for non-monochrome APKs (i.e. pre-N) because
> on L, Android's loader is not yet capable of loading native libraries
> from the APK. This is normally performed by the Chromium linker which
> can't be used by CrashpadMain.java because /system/bin/app_process
> doesn't initialize the process like a normal Android application
> (specifically, no ContextImpl has been created, so any calls to e.g.
> appContext.getApplicationInfo() will segfault).
>
> Binary-Size: MonochromePublic.apk increases in size by 100 KB.
> ChromeModernPublic.apk increases in size by 203KB (587 KB
> increase in install size because libcrashpad_handler.so is extracted
> from the APK). Possible mitigations for this increase are TODO:
>
> For J, K: We could link the handler directly into libchrome.so and let
> that be our handler executable. This would de-dup portions of libbase
> that are currently linked into both libchrome.so and
> libcrashpad_handler.so.
>
> For L, M: It might be possible to get the chromium linker (or Bionic's
> linker on M) to dlopen libchrome.so from the APK for a trampoline
> libcrashpad_handler.so to de-dup libbase.
>
> Bug: crashpad:30
> Change-Id: If5b3752f26455e5c7aef3278b4bd2076ef1b7b65
> Reviewed-on: https://chromium-review.googlesource.com/1150774
> Reviewed-by: Bo <boliu@chromium.org>
> Reviewed-by: agrieve <agrieve@chromium.org>
> Reviewed-by: Mark Mentovai <mark@chromium.org>
> Reviewed-by: Richard Coles <torne@chromium.org>
> Reviewed-by: Luke Halliwell <halliwell@chromium.org>
> Commit-Queue: Joshua Peraza <jperaza@chromium.org>
> Cr-Commit-Position: refs/heads/master@{#594853}

TBR=agieve@chromium.org,torne@chromium.org

Binary-Size: See above.
Bug: crashpad:30
Change-Id: I2b866be642670188d9e8b674fac940b05497b806
Reviewed-on: https://chromium-review.googlesource.com/c/1252007
Commit-Queue: Joshua Peraza <jperaza@chromium.org>
Reviewed-by: Yaron Friedman <yfriedman@chromium.org>
Reviewed-by: Luke Halliwell <halliwell@chromium.org>
Reviewed-by: Mark Mentovai <mark@chromium.org>
Cr-Commit-Position: refs/heads/master@{#612950}