Revert "Move SkFrontBufferedStream into Android-only dir"

This reverts commit 513720f28ece7439b5c0da2d4ed235e153d5c0a4.

Reason for revert: Breaking the google3 roll:
   https://sponge.corp.google.com/invocation?tab=Build+Log&id=5f96970b-8171-4c2f-abf3-006e11b8fff9

Original change's description:
> Move SkFrontBufferedStream into Android-only dir
> 
> Bug: skia:10154
> 
> Add client_utils for code that is specifically for a single client.
> Move SkFrontBufferedStream into its android/ subdir. Rename the class
> to android::skia::FrontBufferedStream. Temporarily leave in
> SkFrontBufferedStream until Android updates to the new API.
> 
> Add a new optional target for client_utils/android. It is built in dev
> builds for testing, and when building for the Android framework.
> 
> Change-Id: Ie0f425051ea370aab7861d61150a3d6007214a93
> Reviewed-on: https://skia-review.googlesource.com/c/skia/+/284721
> Commit-Queue: Leon Scroggins <scroggo@google.com>
> Reviewed-by: Mike Reed <reed@google.com>
> Reviewed-by: Derek Sollenberger <djsollen@google.com>

TBR=djsollen@google.com,scroggo@google.com,reed@google.com

Change-Id: Iaeedaed184cc35f507d5441631ae709e1c5cb1ac
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: skia:10154
Reviewed-on: https://skia-review.googlesource.com/c/skia/+/285100
Reviewed-by: Joe Gregorio <jcgregorio@google.com>
Commit-Queue: Joe Gregorio <jcgregorio@google.com>
12 files changed