Revert of Remove font cache code

content/common/dwrite_font_platform_win_unittest.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 "content/public/common/dwrite_font_platform_win.h"
+
+#include "base/files/file_util.h"
+#include "base/files/scoped_temp_dir.h"
+#include "base/logging.h"
+#include "base/path_service.h"
+#include "content/public/common/content_paths.h"
+#include "testing/gtest/include/gtest/gtest.h"
+#include "ui/gfx/win/direct_write.h"
+
+namespace content {
+
+class DWriteFontCacheTest : public testing::Test {
+ public:
+  DWriteFontCacheTest() { }
+
+  void SetUp() override {
+    base::FilePath data_path;
+    ASSERT_TRUE(PathService::Get(content::DIR_TEST_DATA, &data_path));
+    arial_cache_path_ =
+        data_path.AppendASCII("font/dwrite_font_cache_arial.dat");
+
+    corrupt_cache_path_ =
+        data_path.AppendASCII("font/dwrite_font_cache_corrupt.dat");
+
+    ASSERT_TRUE(temp_dir_.CreateUniqueTempDir());
+    cache_file_path_ = temp_dir_.path().AppendASCII("dwrite_font_cache.dat");
+  }
+
+ protected:
+    base::FilePath arial_cache_path_;
+    base::FilePath corrupt_cache_path_;
+    base::ScopedTempDir temp_dir_;
+    base::FilePath cache_file_path_;
+};
+
+TEST_F(DWriteFontCacheTest, BuildCacheTest) {
+  if (gfx::win::ShouldUseDirectWrite()) {
+    DLOG(INFO) << __FUNCTION__ << ": " << cache_file_path_.value().c_str();
+    EXPECT_TRUE(BuildFontCache(cache_file_path_));
+    ASSERT_TRUE(base::PathExists(cache_file_path_));
+  }
+}
+
+TEST_F(DWriteFontCacheTest, ValidCacheTest) {
+  if (gfx::win::ShouldUseDirectWrite()) {
+    DLOG(INFO) << __FUNCTION__ << ": " << arial_cache_path_.value().c_str();
+    scoped_ptr<base::File> file(new base::File(arial_cache_path_,
+                                base::File::FLAG_OPEN | base::File::FLAG_READ));
+    ASSERT_TRUE(file->IsValid());
+
+    EXPECT_TRUE(ValidateFontCacheFile(file.get()));
+  }
+}
+
+TEST_F(DWriteFontCacheTest, CorruptCacheTest) {
+  if (gfx::win::ShouldUseDirectWrite()) {
+    DLOG(INFO) << __FUNCTION__ << ": " << corrupt_cache_path_.value().c_str();
+    scoped_ptr<base::File> file(new base::File(corrupt_cache_path_,
+                                base::File::FLAG_OPEN | base::File::FLAG_READ));
+    ASSERT_TRUE(file->IsValid());
+
+    EXPECT_FALSE(ValidateFontCacheFile(file.get()));
+  }
+}
+
+} // content