Disable BitmapImageTest.DecoderAndCacheMipLevels

This test started to fail after crrev.com/c/1296870 which was landed
4 hours ago. Disable the test and assign the bug to the owner.

TBR=jdragon.bae@gmail.com
NOTRY=true

Bug: 898372
Change-Id: I7b3d8ba10535caed7226b295d74537ac7e5dfeda
Reviewed-on: https://chromium-review.googlesource.com/c/1297715Reviewed-by: Yi Gu <yigu@chromium.org>
Commit-Queue: Yi Gu <yigu@chromium.org>
Cr-Commit-Position: refs/heads/master@{#602220}

third_party/blink/renderer/platform/graphics/bitmap_image_test.cc

@@ -563,7 +563,8 @@ TEST_F(BitmapImageTest, GIFRepetitionCount) {
   EXPECT_EQ(paint_image.FrameCount(), 3u);
 }
 
-TEST_F(BitmapImageTest, DecoderAndCacheMipLevels) {
+// This test is failing on all bots. See https://crbug.com/898372
+TEST_F(BitmapImageTest, DISABLED_DecoderAndCacheMipLevels) {
   // Here, we want to test that the mip level calculated by the cc matches
   // exactly a size supported by the decoder. This is to make sure that the
   // rounding used in cc matches the rounding in the decoder. The image in this