Suppressions for WebGL 2.0.1 failures on Win Intel.

BUG=662644
TBR=zmo@chromium.org
CQ_INCLUDE_TRYBOTS=master.tryserver.chromium.linux:linux_optional_gpu_tests_rel;master.tryserver.chromium.mac:mac_optional_gpu_tests_rel;master.tryserver.chromium.win:win_optional_gpu_tests_rel;master.tryserver.chromium.android:android_optional_gpu_tests_rel

Review-Url: https://codereview.chromium.org/2549003002
Cr-Commit-Position: refs/heads/master@{#436214}

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

@@ -88,6 +88,13 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Flaky('deqp/*', ['win', ('amd', 0x6779)], bug=491419)
 
     # Win / Intel
+    self.Fail('conformance2/glsl3/' +
+        'texture-offset-uniform-texture-coordinate.html',
+        ['win', 'intel'], bug=662644) # WebGL 2.0.1
+    self.Fail('conformance2/glsl3/unary-minus-operator-in-dynamic-loop.html',
+        ['win', 'intel'], bug=662644) # WebGL 2.0.1
+    self.Fail('conformance2/rendering/clear-srgb-color-buffer.html',
+        ['win', 'intel'], bug=662644) # WebGL 2.0.1
     self.Skip('conformance2/textures/misc/copy-texture-image.html',
         ['win', 'intel'], bug=617449)
     # Seems to cause the harness to fail immediately afterward