Support single-threaded impl-side painting

cc/trees/layer_tree_host_pixeltest_synchronous.cc

+// Copyright 2014 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 "build/build_config.h"
+#include "cc/layers/content_layer_client.h"
+#include "cc/layers/picture_image_layer.h"
+#include "cc/layers/picture_layer.h"
+#include "cc/layers/solid_color_layer.h"
+#include "cc/test/fake_content_layer_client.h"
+#include "cc/test/layer_tree_pixel_test.h"
+#include "cc/test/pixel_comparator.h"
+
+#if !defined(OS_ANDROID)
+
+namespace cc {
+namespace {
+
+class LayerTreeHostSynchronousPixelTest : public LayerTreePixelTest {
+ public:
+  void InitializeSettings(LayerTreeSettings* settings) override {
+    LayerTreePixelTest::InitializeSettings(settings);
+    settings->single_thread_proxy_scheduler = false;
+    settings->use_zero_copy = true;
+  }
+
+  void BeginTest() override {
+    LayerTreePixelTest::BeginTest();
+    PostCompositeImmediatelyToMainThread();
+  }
+};
+
+TEST_F(LayerTreeHostSynchronousPixelTest, OneContentLayer) {
+  gfx::Size bounds(200, 200);
+
+  FakeContentLayerClient client;
+  SkPaint green_paint;
+  green_paint.setColor(SkColorSetARGB(255, 0, 255, 0));
+  client.add_draw_rect(gfx::RectF(bounds), green_paint);
+  scoped_refptr<PictureLayer> root = PictureLayer::Create(&client);
+  root->SetBounds(bounds);
+  root->SetIsDrawable(true);
+
+  RunSingleThreadedPixelTest(
+      PIXEL_TEST_GL, root, base::FilePath(FILE_PATH_LITERAL("green.png")));
+}
+
+}  // namespace
+}  // namespace cc
+
+#endif  // OS_ANDROID