Move test-only stuff from cc/debug/ to cc/test

cc/debug/test_texture.cc

-// 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 "cc/debug/test_texture.h"
-
-#include "third_party/khronos/GLES2/gl2.h"
-
-namespace cc {
-
-size_t TextureSizeBytes(gfx::Size size, ResourceFormat format) {
-  unsigned int components_per_pixel = 4;
-  unsigned int bytes_per_component = 1;
-  return size.width() * size.height() * components_per_pixel *
-         bytes_per_component;
-}
-
-TestTexture::TestTexture()
-    : format(RGBA_8888), filter(GL_NEAREST_MIPMAP_LINEAR) {}
-
-TestTexture::~TestTexture() {}
-
-void TestTexture::Reallocate(gfx::Size size, ResourceFormat format) {
-  this->size = size;
-  this->format = format;
-  this->data.reset(new uint8_t[TextureSizeBytes(size, format)]);
-}
-
-}  // namespace cc