Scroll Capture Framework

This is an implementation of long screenshots supporting
interactive, incremental capture of scrolling content using
a cooperative API between the app process and the system.

Design goals:

 - Provide for tile based incremental screenshots of scrolling content
 - Support existing apps without developer action
 - Provide support for non View-based Apps & UI toolkits

Bug: 148131831
Test: atest \
      FrameworksCoreTests:android.view.ScrollCaptureClientTest \
      FrameworksCoreTests:android.view.ScrollCaptureTargetResolverTest \
      FrameworksCoreTests:com.android.internal.view.ViewGroupScrollCaptureTest \
      FrameworksCoreTests:android.view.ScrollViewCaptureHelperTest \
      WmTests:com.android.server.wm.DisplayContentTest

Merged-In: I6c66a623faba274c35b8fa857d3a72030a763aea
Change-Id: I6c66a623faba274c35b8fa857d3a72030a763aea