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In draw occlusion algorithm, the total area of drawing is calculated to
measure the effectiveness of draw occlusion. However, the integer
multiplication in the area calculation has caused the integer overflow
crash with huge draw quads. In this patch, I used GetCheckedArea() to
check for the resulting area before assigning.

Bug: 826727

Cq-Include-Trybots: luci.chromium.try:android_optional_gpu_tests_rel
Change-Id: I667b458ca6f7d477ba13036868536dd842e59068
Reviewed-on: https://chromium-review.googlesource.com/991121
Commit-Queue: Yi Xu <yiyix@chromium.org>
Reviewed-by: danakj <danakj@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547856}