Add two pixel-based compositor unittests.

ui/gfx/compositor/test/test_texture.h

Index: ui/gfx/compositor/test/test_texture.h
diff --git a/ui/gfx/compositor/test_texture.h b/ui/gfx/compositor/test/test_texture.h
similarity index 89%
rename from ui/gfx/compositor/test_texture.h
rename to ui/gfx/compositor/test/test_texture.h
index 95a6f2a9222158ed8a1a01809b149930285f46fc..1d788943628e22f9bb6a53796f3348edb4f250d6 100644
--- a/ui/gfx/compositor/test_texture.h
+++ b/ui/gfx/compositor/test/test_texture.h
@@ -2,8 +2,8 @@
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
-#ifndef UI_GFX_COMPOSITOR_TEST_TEXTURE_H_
-#define UI_GFX_COMPOSITOR_TEST_TEXTURE_H_
+#ifndef UI_GFX_COMPOSITOR_TEST_TEST_TEXTURE_H_
+#define UI_GFX_COMPOSITOR_TEST_TEST_TEXTURE_H_
 #pragma once
 
 #include "base/basictypes.h"
@@ -47,4 +47,4 @@ class TestTexture : public ui::Texture {
 
 }  // namespace ui
 
-#endif  // UI_GFX_COMPOSITOR_TEST_TEXTURE_H_
+#endif  // UI_GFX_COMPOSITOR_TEST_TEST_TEXTURE_H_