cc: Add layer-based pixel tests.

cc/test/layer_tree_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_path.h"
+#include "cc/solid_color_layer.h"
+#include "cc/test/layer_tree_test_common.h"
+
+#ifndef CC_TEST_LAYER_TREE_PIXEL_TEST_H_
+#define CC_TEST_LAYER_TREE_PIXEL_TEST_H_
+
+namespace cc {
+class LayerTreeHost;
+
+class LayerTreePixelTest : public ThreadedTest {
+ protected:
+  LayerTreePixelTest();
+  virtual ~LayerTreePixelTest();
+
+  bool RunTest(scoped_refptr<Layer> root_layer,
+               const base::FilePath::StringType& file_name);
+
+  virtual scoped_ptr<OutputSurface> createOutputSurface() OVERRIDE;
+  virtual scoped_refptr<cc::ContextProvider>
+      OffscreenContextProviderForMainThread() OVERRIDE;
+  virtual scoped_refptr<cc::ContextProvider>
+      OffscreenContextProviderForCompositorThread() OVERRIDE;
+  virtual void swapBuffersOnThread(LayerTreeHostImpl* host_impl,
+                                   bool result) OVERRIDE;
+
+  virtual void beginTest() OVERRIDE;
+  virtual void setupTree() OVERRIDE;
+  virtual void afterTest() OVERRIDE;
+
+  scoped_refptr<SolidColorLayer> CreateSolidColorLayer(gfx::Rect rect,
+                                                       SkColor color);
+
+  void RunPixelTest(scoped_refptr<Layer> content_root,
+                    base::FilePath file_name);
+
+  // Common CSS colors defined for tests to use.
+  enum Colors {
+    kCSSOrange = 0xffffa500,
+    kCSSBrown = 0xffa52a2a,
+    kCSSGreen = 0xff008000,
+  };
+
+ private:
+  scoped_refptr<Layer> content_root_;
+  base::FilePath ref_file_;
+};
+
+}  // namespace cc
+
+#endif  // CC_TEST_LAYER_TREE_PIXEL_TEST_H_