Copy arguments into RenderEngineThreaded

RenderEngineThreaded currently crashes when trying to create framebuffer
in function: createFramebufferImageIfNeeded. Looks like passing the copy
of arguments fixes the problem.

Bug: 157932582
Test: Print mFramebufferImageCacheSize, when threaded is off: 2
Test: Print mFramebufferImageCacheSize, when threaded is on: 2
Test: Open Chrome to trigger RE composition.
Test: Pull down status bar to trigger RE composition.
Change-Id: I3b21e0d159d63ea4454e46d10ffe698c4c1c3c4e