Vulkan: Enable UnpackAlignmentTest and remove useless warning.

src/libANGLE/renderer/vulkan/ContextVk.cpp

@@ -490,7 +490,8 @@ void ContextVk::syncState(const gl::Context *context, const gl::State::DirtyBits
                     static_cast<uint32_t>(glState.getStencilClearValue());
                 break;
             case gl::State::DIRTY_BIT_UNPACK_STATE:
-                WARN() << "DIRTY_BIT_UNPACK_STATE unimplemented";
+                // This is a no-op, its only important to use the right unpack state when we do
+                // setImage or setSubImage in TextureVk, which is plumbed through the frontend call
                 break;
             case gl::State::DIRTY_BIT_UNPACK_BUFFER_BINDING:
                 WARN() << "DIRTY_BIT_UNPACK_BUFFER_BINDING unimplemented";

src/tests/gl_tests/UnpackAlignmentTest.cpp

@@ -305,6 +305,7 @@ ANGLE_INSTANTIATE_TEST(UnpackAlignmentTest,
                        ES2_D3D9(),
                        ES2_D3D11(),
                        ES2_OPENGL(),
+                       ES2_VULKAN(),
                        ES3_OPENGL(),
                        ES2_OPENGLES(),
                        ES3_OPENGLES());