cc: Add pixel tests for transfer function shaders

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"
@@ skipping 16 matching lines @@
 
 class PixelTest : public testing::Test {
  protected:
   PixelTest();
   ~PixelTest() override;
 
   bool RunPixelTest(RenderPassList* pass_list,
                     const base::FilePath& ref_file,
                     const PixelComparator& comparator);
 
+  bool RunPixelTest(RenderPassList* pass_list,
+                    std::vector<SkColor>* ref_pixels,
+                    const PixelComparator& comparator);
+
   bool RunPixelTestWithReadbackTarget(
       RenderPassList* pass_list,
       RenderPass* target,
       const base::FilePath& ref_file,
       const PixelComparator& comparator);
 
   bool RunPixelTestWithReadbackTargetAndArea(RenderPassList* pass_list,
                                              RenderPass* target,
                                              const base::FilePath& ref_file,
                                              const PixelComparator& comparator,
@@ skipping 105 matching lines @@
 inline void RendererPixelTest<SoftwareRendererWithExpandedViewport>::SetUp() {
   SetUpSoftwareRenderer();
 }
 
 typedef RendererPixelTest<GLRenderer> GLRendererPixelTest;
 typedef RendererPixelTest<SoftwareRenderer> SoftwareRendererPixelTest;
 
 }  // namespace cc
 
 #endif  // CC_TEST_PIXEL_TEST_H_