Support SOLID_COLOR composition in GuestFrameComposer

... to avoid needed client composition during media tests which
requires expensive SwiftShader sampling.

Bug: b/272786456
Test: cts -m CtsMediaStressTestCases
      and capture Perfetto trace to confirm SurfaceFlinger is not
      performing client composition.
Change-Id: Ibdb5773655d6914e9063d1a14095e5395a2639cf
1 file changed