Implement support for importing favorites from Edge on Windows 10.

chrome/common/importer/edge_importer_utils_win.cc

+// Copyright 2015 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 "chrome/common/importer/edge_importer_utils_win.h"
+
+#include <Shlobj.h>
+
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/win/registry.h"
+#include "base/win/windows_version.h"
+#include "chrome/common/importer/ie_importer_test_registry_overrider_win.h"
+
+namespace {
+
+const base::char16 kEdgeFavoritesOrderKey[] =
+    L"MicrosoftEdge\\FavOrder\\Favorites";
+
+const base::char16 kEdgeSettingsMainKey[] = L"MicrosoftEdge\\Main";
+
+const base::char16 kEdgePackageName[] =
+    L"microsoft.microsoftedge_8wekyb3d8bbwe";
+
+// We assume at the moment that the package name never changes for Edge.
+base::string16 GetEdgePackageName() {
+  return kEdgePackageName;
+}
+
+base::string16 GetEdgeRegistryKey(const base::string16& key_name) {
+  base::string16 base_key =
+      L"Software\\Classes\\Local "
+      L"Settings\\Software\\Microsoft\\Windows\\CurrentVersion\\AppContainer\\S"
+      L"torage\\";

[Ilya Sherman, 2015/11/26 02:04:44]

nit: This string is pretty oddly wrapped.  Could you please re-wrap it so that
the first line is longer, and the line break comes immediately after a "\\"?

[forshaw, 2015/11/30 12:57:58]

Will fix, clearly cl format doesn't understand the best place to break path
strings.

+  base_key += GetEdgePackageName();
+  base_key += L"\\";
+  base_key += key_name;
+  return base_key;

[Ilya Sherman, 2015/11/26 02:04:43]

nit: What does the "base" in "base_key" mean?

[forshaw, 2015/11/30 12:57:58]

Will rename.

+}
+
+base::string16 GetPotentiallyOverridenIEKey(

[Ilya Sherman, 2015/11/26 02:04:43]

nit: s/IE/Edge?

+    const base::string16& desired_key_path) {
+  base::string16 test_reg_override(

[Ilya Sherman, 2015/11/26 02:04:44]

nit: s/reg/registry

+      IEImporterTestRegistryOverrider::GetTestRegistryOverride());
+  return test_reg_override.empty() ? GetEdgeRegistryKey(desired_key_path)
+                                   : test_reg_override;
+}
+
+}  // namespace
+
+namespace importer {
+
+base::string16 GetEdgeFavoritesOrderKey() {
+  return GetPotentiallyOverridenIEKey(kEdgeFavoritesOrderKey);
+}
+
+base::string16 GetEdgeSettingsKey() {
+  return GetPotentiallyOverridenIEKey(kEdgeSettingsMainKey);
+}
+
+base::FilePath GetEdgeDataFilePath() {
+  wchar_t buffer[MAX_PATH];

[Ilya Sherman, 2015/11/26 02:04:43]

I noticed that a lot -- but not all -- of our other code initializes this buffer
to have a nul-terminator character at index 0, i.e. to be an empty C-string. 
I'm not sure why that's done, so I don't know whether its' needed here... but
maybe you know?

[forshaw, 2015/11/30 12:57:58]

This is a Windows coding idiom to initialize arrays and objects, it isn't
necessary unless the value of the buffer was to be later used. In this case the
buffer is not used unless SHGetFolderPath returns S_OK so doesn't need to be
initialized but will do for consistency.

+  if (::SHGetFolderPath(NULL, CSIDL_LOCAL_APPDATA, NULL, SHGFP_TYPE_CURRENT,

[Ilya Sherman, 2015/11/26 02:04:43]

Why do you need the leading "::"?

[forshaw, 2015/11/30 12:57:58]

Again a common Windows idiom to ensure you access the global namespace as all
Windows APIs are within that namespace.

+                        buffer) != S_OK)

[Ilya Sherman, 2015/11/26 02:04:43]

nit: I noticed that other code uses FAILED rather than comparing to S_OK.  I am
not a Windows programmer, but I wonder if that's the preferred style, or
possibly even functionally different somehow.

[forshaw, 2015/11/30 12:57:58]

I think the other code is technically wrong, but would work in 99% of cases. In
this case the function is documented to return S_OK on success but can return
S_FALSE in certain error conditions. S_FALSE is considered to be a success from
the FAILED macro perspective. Confusing I realize.

+    return base::FilePath();
+
+  base::FilePath base_path(buffer);
+  base::string16 rel_path = L"Packages\\";
+  rel_path += GetEdgePackageName();
+  rel_path += L"\\AC\\MicrosoftEdge\\User\\Default";
+  return base_path.Append(rel_path);
+}
+
+bool IsEdgeFavoritesLegacyMode() {
+  base::win::RegKey key(HKEY_CURRENT_USER, GetEdgeSettingsKey().c_str(),
+                        KEY_READ);
+  DWORD ese_enabled = 0;

[Ilya Sherman, 2015/11/26 02:04:44]

nit: I don't know what "ese" is.  Please either expand the acronym or document
it.

[forshaw, 2015/11/30 12:57:58]

Acknowledged.

+  if (key.ReadValueDW(L"FavoritesESEEnabled", &ese_enabled) == ERROR_SUCCESS)
+    return !ese_enabled;
+  return true;
+}
+
+bool EdgeImporterCanImport() {
+  base::File::Info file_info;
+  if (base::win::GetVersion() < base::win::VERSION_WIN10)
+    return false;
+  return base::GetFileInfo(GetEdgeDataFilePath(), &file_info) &&
+         file_info.is_directory;
+}
+
+}  // namespace importer