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

cc/test/pixel_test.h

Index: cc/test/pixel_test.h
diff --git a/cc/test/pixel_test.h b/cc/test/pixel_test.h
index 4f9eb6eb1db268bbedb2f9a8908b8d2a71b9ee2d..be32c6075d94d2632dfa7758c42f804f94fd6d2f 100644
--- a/cc/test/pixel_test.h
+++ b/cc/test/pixel_test.h
@@ -25,7 +25,7 @@ class SoftwareRenderer;
 class TestGpuMemoryBufferManager;
 class TestSharedBitmapManager;
 
-class PixelTest : public testing::Test, RendererClient {
+class PixelTest : public testing::Test, public RendererClient {
  protected:
   PixelTest();
   ~PixelTest() override;