Refactor context creation parameters into a struct.

ui/gl/test/gl_image_test_template.h

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 // This file defines tests that implementations of GLImage should pass in order
 // to be conformant.
 
 #ifndef UI_GL_TEST_GL_IMAGE_TEST_TEMPLATE_H_
 #define UI_GL_TEST_GL_IMAGE_TEST_TEMPLATE_H_
 
@@ skipping 147 matching lines @@
 }  // namespace
 
 template <typename GLImageTestDelegate>
 class GLImageTest : public testing::Test {
  protected:
   // Overridden from testing::Test:
   void SetUp() override {
     GLImageTestSupport::InitializeGL();
     surface_ = gl::init::CreateOffscreenGLSurface(gfx::Size());
     context_ =
-        gl::init::CreateGLContext(nullptr, surface_.get(), PreferIntegratedGpu);
+        gl::init::CreateGLContext(nullptr, surface_.get(), GLContextAttribs());
     context_->MakeCurrent(surface_.get());
   }
   void TearDown() override {
     context_->ReleaseCurrent(surface_.get());
     context_ = nullptr;
     surface_ = nullptr;
     GLImageTestSupport::CleanupGL();
   }
 
  protected:
@@ skipping 220 matching lines @@
   }
 }
 
 // The GLImageCopyTest test case verifies that the GLImage implementation
 // handles CopyTexImage correctly.
 REGISTER_TYPED_TEST_CASE_P(GLImageCopyTest, CopyTexImage);
 
 }  // namespace gl
 
 #endif  // UI_GL_TEST_GL_IMAGE_TEST_TEMPLATE_H_