Clear IOSurfaces immediately after creating them.

ui/gl/test/gl_image_test_template.h

Index: ui/gl/test/gl_image_test_template.h
diff --git a/ui/gl/test/gl_image_test_template.h b/ui/gl/test/gl_image_test_template.h
index 09b451c5b3c9491ae1d308ebf418498c9476b465..75c98c0cd85854135b517c0cc06183eef442e534 100644
--- a/ui/gl/test/gl_image_test_template.h
+++ b/ui/gl/test/gl_image_test_template.h
@@ -169,9 +169,7 @@ class GLImageZeroInitializeTest : public GLImageTest<GLImageTestDelegate> {};
 // result is zero-initialized.
 TYPED_TEST_CASE_P(GLImageZeroInitializeTest);
 
-// TODO(erikchen): Enable this test when it actually passes on Mac.
-// https://crbug.com/584760.
-TYPED_TEST_P(GLImageZeroInitializeTest, DISABLED_ZeroInitialize) {
+TYPED_TEST_P(GLImageZeroInitializeTest, ZeroInitialize) {
   const gfx::Size image_size(256, 256);
   scoped_refptr<gl::GLImage> image = this->delegate_.CreateImage(image_size);
   GLenum target = this->delegate_.GetTextureTarget();
@@ -205,7 +203,7 @@ TYPED_TEST_P(GLImageZeroInitializeTest, DISABLED_ZeroInitialize) {
   glDeleteTextures(1, &uninitialized_texture);
 }
 
-REGISTER_TYPED_TEST_CASE_P(GLImageZeroInitializeTest, DISABLED_ZeroInitialize);
+REGISTER_TYPED_TEST_CASE_P(GLImageZeroInitializeTest, ZeroInitialize);
 
 template <typename GLImageTestDelegate>
 class GLImageCopyTest : public GLImageTest<GLImageTestDelegate> {};