Pass initial size and GPU preference via context attributes

components/display_compositor/gl_helper_unittest.cc

Index: components/display_compositor/gl_helper_unittest.cc
diff --git a/components/display_compositor/gl_helper_unittest.cc b/components/display_compositor/gl_helper_unittest.cc
index ef67697dee545ae7b42dfc36b0983f7e29b3b007..44fe9917713b928d1e08aaf2b12c8f6c94c8b20b 100644
--- a/components/display_compositor/gl_helper_unittest.cc
+++ b/components/display_compositor/gl_helper_unittest.cc
@@ -71,9 +71,8 @@ class GLHelperTest : public testing::Test {
         nullptr,                     /* surface */
         true,                        /* offscreen */
         gfx::kNullAcceleratedWidget, /* window */
-        gfx::Size(1, 1),             /* size */
         nullptr,                     /* share_context */
-        attributes, gl::PreferDiscreteGpu, gpu::SharedMemoryLimits(),
+        attributes, gpu::SharedMemoryLimits(),
         nullptr, /* gpu_memory_buffer_manager */
         nullptr /* image_factory */));
     gl_ = context_->GetImplementation();