Fix HLSL for switch statements that don't end in a branch In case the last case inside a switch statement is not terminated in a branch statement, RemoveSwitchFallThrough needs to add it before calling handlePreviousCase. This ensures that all preceding fall-through cases will get a copy of the branch statement and so will not fall through. This also fixes running RemoveSwitchFallThrough so that it's only executed once per each switch statement. The error was not caught by the dEQP tests, so a new ANGLE test is added. BUG=angleproject:2178 TEST=angle_end2end_tests Change-Id: I26b6989aa4d32de2d74cde56d72ee24f61195445 Reviewed-on: https://chromium-review.googlesource.com/709196 Reviewed-by: Jamie Madill <jmadill@chromium.org> Reviewed-by: Corentin Wallez <cwallez@chromium.org> Commit-Queue: Olli Etuaho <oetuaho@nvidia.com>