Disable VTConfigUtil.GetImageBufferColorSpace

Disabled the following tests because they are failing
 on Mac-10.10, Mac-10.11, Mac-10.12:
1. GetImageBufferColorSpace_BT2020_PQ
2. DISABLED_GetImageBufferColorSpace_BT2020_HLG

TBR: dalecurtis@chromium.org

No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Bug: 1113153
Change-Id: I9e2c19ed2ef7bae4fea9406d1922a46fbe673bf0
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2339454Reviewed-by: Aya Elsayed <ayaelattar@chromium.org>
Commit-Queue: Aya Elsayed <ayaelattar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#795000}

media/gpu/mac/vt_config_util_unittest.cc

@@ -268,7 +268,7 @@ TEST(VTConfigUtil, GetImageBufferColorSpace_GAMMA28) {
   EXPECT_EQ(cs.ToGfxColorSpace(), GetImageBufferColorSpace(image_buffer));
 }
 
-TEST(VTConfigUtil, GetImageBufferColorSpace_BT2020_PQ) {
+TEST(VTConfigUtil, DISABLED_GetImageBufferColorSpace_BT2020_PQ) {
   auto cs = VideoColorSpace(VideoColorSpace::PrimaryID::BT2020,
                             VideoColorSpace::TransferID::SMPTEST2084,
                             VideoColorSpace::MatrixID::BT2020_NCL,
@@ -278,7 +278,7 @@ TEST(VTConfigUtil, GetImageBufferColorSpace_BT2020_PQ) {
   EXPECT_EQ(cs.ToGfxColorSpace(), GetImageBufferColorSpace(image_buffer));
 }
 
-TEST(VTConfigUtil, GetImageBufferColorSpace_BT2020_HLG) {
+TEST(VTConfigUtil, DISABLED_GetImageBufferColorSpace_BT2020_HLG) {
   auto cs = VideoColorSpace(VideoColorSpace::PrimaryID::BT2020,
                             VideoColorSpace::TransferID::ARIB_STD_B67,
                             VideoColorSpace::MatrixID::BT2020_NCL,