cc: Delete the RendererClient class.

Just call SetFullViewportDamage from Display::SetVisible(false).

The drops the Ensure/DiscardBackbuffer methods from the DirectRenderer
API also, and just does EnsureBackbuffer when SetVisible(true) in
GLRenderer which matches the SoftwareRenderer.

R=enne
BUG=606056
CQ_INCLUDE_TRYBOTS=master.tryserver.blink:linux_precise_blink_rel

Review-Url: https://codereview.chromium.org/2254543003
Cr-Commit-Position: refs/heads/master@{#412430}
25 files changed