Initialize the Display's renderer when the Display is initialized.

cc/test/pixel_test.h

 // Copyright 2013 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.
 
 #include "base/files/file_util.h"
 #include "cc/output/gl_renderer.h"
 #include "cc/output/software_renderer.h"
 #include "cc/quads/render_pass.h"
 #include "cc/test/pixel_comparator.h"
 #include "cc/trees/layer_tree_settings.h"
 #include "testing/gtest/include/gtest/gtest.h"
 #include "ui/gfx/geometry/size.h"
 #include "ui/gl/gl_implementation.h"
 
 #ifndef CC_TEST_PIXEL_TEST_H_
 #define CC_TEST_PIXEL_TEST_H_
 
 namespace cc {
 class CopyOutputResult;
 class DirectRenderer;
 class FakeOutputSurfaceClient;
 class OutputSurface;
 class ResourceProvider;
 class SoftwareRenderer;
 class TestGpuMemoryBufferManager;
 class TestSharedBitmapManager;
 
-class PixelTest : public testing::Test, RendererClient {
+class PixelTest : public testing::Test, public RendererClient {
  protected:
   PixelTest();
   ~PixelTest() override;
 
   bool RunPixelTest(RenderPassList* pass_list,
                     const base::FilePath& ref_file,
                     const PixelComparator& comparator);
 
   bool RunPixelTestWithReadbackTarget(
       RenderPassList* pass_list,
@@ skipping 127 matching lines @@
   ForceExpandedViewport(gfx::Size(50, 50));
   ForceViewportOffset(gfx::Vector2d(10, 20));
 }
 
 typedef RendererPixelTest<GLRenderer> GLRendererPixelTest;
 typedef RendererPixelTest<SoftwareRenderer> SoftwareRendererPixelTest;
 
 }  // namespace cc
 
 #endif  // CC_TEST_PIXEL_TEST_H_