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A clip rect mapped through multiple transform spaces can be
(1.99999, 2.00001, 10.999998, 20.000002). Previously we use
ToEnclosingRect to convert it to an integral rect and will result
a rect that has 1 pixel bigger in some directions, causing
incorrect clipping result.

Now add gfx::ToEnclosingIgnoringError to convert a near integral
gfx::RectF to the nearest integral gfx::Rect.

Bug: 879173
Cq-Include-Trybots: luci.chromium.try:linux-blink-gen-property-trees;luci.chromium.try:linux_layout_tests_slimming_paint_v2;luci.chromium.try:android_optional_gpu_tests_rel;master.tryserver.blink:linux_trusty_blink_rel
Change-Id: Id7ab68c04f8f1efed1dfe1810b82dd24d1a41ea5
Reviewed-on: https://chromium-review.googlesource.com/1252143Reviewed-by: Ian Vollick <vollick@chromium.org>
Reviewed-by: Ali Juma <ajuma@chromium.org>
Commit-Queue: Xianzhu Wang <wangxianzhu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#595947}