Enable two webgl2 conformance tests.

content/test/gpu/gpu_tests/webgl2_conformance_expectations.py

Index: content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
diff --git a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
index 9f9df26d3bd1270de83ea1bfb169fb221b551a56..4033134e05940a44b5a0095296af22b37003c367 100644
--- a/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
+++ b/content/test/gpu/gpu_tests/webgl2_conformance_expectations.py
@@ -39,9 +39,7 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Skip('deqp/functional/gles3/fragmentoutput.html', bug=483282)
     self.Skip('deqp/functional/gles3/framebufferblit.html', bug=483282)
     self.Skip('deqp/functional/gles3/instancedrendering.html', bug=483282)
-    self.Skip('deqp/functional/gles3/lifetime.html', bug=483282)
     self.Skip('deqp/data/gles3/shaders/linkage.html', bug=601821)
-    self.Skip('deqp/functional/gles3/multisample.html', bug=483282)
     self.Skip('deqp/functional/gles3/negativebufferapi.html', bug=483282)
     self.Skip('deqp/functional/gles3/negativetextureapi.html', bug=483282)
     self.Skip('deqp/functional/gles3/negativevertexarrayapi.html', bug=483282)
@@ -78,6 +76,10 @@ class WebGL2ConformanceExpectations(WebGLConformanceExpectations):
     self.Fail('conformance2/textures/misc/tex-input-validation.html',
         ['d3d9', 'd3d11', 'opengl'], bug=483282)
 
+    # All platforms with AMD GPU.
+    self.Fail('deqp/functional/gles3/multisample.html',
+        ['amd'], bug=617290)
+
     # Failing because the tests are using invalid combinations of source and
     # destination formats, see https://github.com/KhronosGroup/WebGL/issues/1628
     self.Fail('conformance2/textures/webgl_canvas/' +