Create a temporary copy of test database in DOMStorageDatabaseTest.

DOMStorageDatabaseTest.TestCanOpenAndReadWebCoreDatabase uses a prepared
test database, and verifies that it can be opened and read. The test
opens the file directly from DIR_TEST_DATA, and so fails if that is
readonly.

Create a copy of the test database to open, to allow for this.

Bug: 798851
Change-Id: I8d99e927c82024be7b0d98cdb4959a6210fe98a8
Reviewed-on: https://chromium-review.googlesource.com/1018491
Commit-Queue: Marijn Kruisselbrink <mek@chromium.org>
Reviewed-by: Marijn Kruisselbrink <mek@chromium.org>
Cr-Commit-Position: refs/heads/master@{#552100}

content/browser/dom_storage/dom_storage_database.h

@@ -123,6 +123,8 @@ class CONTENT_EXPORT DOMStorageDatabase {
   bool failed_to_open_;
   bool tried_to_recreate_;
   bool known_to_be_empty_;
+
+  DISALLOW_COPY_AND_ASSIGN(DOMStorageDatabase);
 };
 
 }  // namespace content

content/browser/dom_storage/dom_storage_database_unittest.cc

@@ -311,11 +311,17 @@ TEST(DOMStorageDatabaseTest, TestSimpleRemoveOneValue) {
 TEST(DOMStorageDatabaseTest, TestCanOpenAndReadWebCoreDatabase) {
   base::FilePath dir_test_data;
   ASSERT_TRUE(PathService::Get(DIR_TEST_DATA, &dir_test_data));
-  base::FilePath webcore_database = dir_test_data.AppendASCII("dom_storage");
-  webcore_database =
-      webcore_database.AppendASCII("webcore_test_database.localstorage");
+  base::FilePath test_data = dir_test_data.AppendASCII("dom_storage");
+  test_data = test_data.AppendASCII("webcore_test_database.localstorage");
+  ASSERT_TRUE(base::PathExists(test_data));
 
-  ASSERT_TRUE(base::PathExists(webcore_database));
+  // Create a temporary copy of the WebCore test database, in case DIR_TEST_DATA
+  // is read-only.
+  base::ScopedTempDir temp_dir;
+  ASSERT_TRUE(temp_dir.CreateUniqueTempDir());
+  base::FilePath webcore_database =
+      temp_dir.GetPath().AppendASCII("dom_storage");
+  ASSERT_TRUE(base::CopyFile(test_data, webcore_database));
 
   DOMStorageDatabase db(webcore_database);
   DOMStorageValuesMap values;