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The RenderPass::output_rect and host window bounds for SurfaceTreeHost
were set to the content size of the root surface. Hence, surfaces were
clipped to the viewport (0, 0) × (W, H), where (W, H) is the size of
the root surface. The root surface of ARC windows is sized to match
the Android display.

This CL computes the output_rect as the bounding box of the surface
tree, and resizes the host window to match the output_rect.

Bug: b:64893967
Test: Windows whose bounds exceed the bottom/right edges of the display
      are not clipped in overview mode.

Change-Id: I51ddf7405e703f5c546aec88a01cc004d105b18a
Reviewed-on: https://chromium-review.googlesource.com/639472
Commit-Queue: Dominik Laskowski <domlaskowski@chromium.org>
Reviewed-by: David Reveman <reveman@chromium.org>
Cr-Commit-Position: refs/heads/master@{#505871}