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Replace the GPU.DirectComposition.SwapBuffersFailed UMA which was being
emitted on failure only with SwapBuffersResult which is emitted on both
success and failure.

Bug: 869677
Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel;luci.chromium.try:linux_optional_gpu_tests_rel;luci.chromium.try:mac_optional_gpu_tests_rel;luci.chromium.try:win_optional_gpu_tests_rel
Change-Id: If950beb70d22f64997e7533751abcf9448d608db
Reviewed-on: https://chromium-review.googlesource.com/1187128
Commit-Queue: Sunny Sachanandani <sunnyps@chromium.org>
Reviewed-by: Ilya Sherman <isherman@chromium.org>
Reviewed-by: Zhenyao Mo <zmo@chromium.org>
Cr-Commit-Position: refs/heads/master@{#586082}