Update webgl2 conformance expectations

* transform_feedback/switching-objects.html - Mac/NVIDIA
* transform_feedback/switching-objects.html - Linux/AMD
* clipping-wide-points - Win/NVIDIA (ANGLE GL backend)

TBR=kbr@chromium.org
NOTRY=true

Bug: 828572, 828579
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;master.tryserver.chromium.win:win_optional_gpu_tests_rel
Change-Id: I6e62daa01635fe00f94e7943d5c7647c5d1a7bc6
Reviewed-on: https://chromium-review.googlesource.com/994185
Commit-Queue: Kai Ninomiya <kainino@chromium.org>
Reviewed-by: Kai Ninomiya <kainino@chromium.org>
Cr-Commit-Position: refs/heads/master@{#547852}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -120,10 +120,14 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
         ['linux', 'nvidia', 'no_angle'], bug=696345)
     self.Fail('conformance2/transform_feedback/switching-objects.html',
         ['linux', 'intel', 'no_angle'], bug=696345)
+    self.Fail('conformance2/transform_feedback/switching-objects.html',
+        ['linux', 'amd', 'no_angle'], bug=696345)
     self.Fail('conformance2/transform_feedback/switching-objects.html',
         ['mac', 'intel', 'no_angle'], bug=696345)
     self.Fail('conformance2/transform_feedback/switching-objects.html',
         ['mac', 'amd', 'no_angle'], bug=696345)
+    self.Fail('conformance2/transform_feedback/switching-objects.html',
+        ['mac', 'nvidia', 'no_angle'], bug=828579)
 
     # transform_feedback/too-small-buffers.html
     self.Fail('conformance2/transform_feedback/too-small-buffers.html',
@@ -252,6 +256,8 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/rendering/' +
         'blitframebuffer-srgb-and-linear-drawbuffers.html',
         ['win', 'nvidia', 'opengl'], bug=2355) # ANGLE bug ID
+    self.Fail('conformance2/rendering/clipping-wide-points.html',
+        ['win', 'nvidia', 'opengl'], bug=828572)
 
     self.Flaky('deqp/functional/gles3/transformfeedback/*',
         ['win', ('nvidia', 0x1cb3), 'opengl'], bug=822733)