The on screen keyboard on Windows 8+ should not obscure the input field.

ui/base/win/osk_display_manager_unittest.cc

Index: ui/base/win/osk_display_manager_unittest.cc
diff --git a/ui/base/win/osk_display_manager_unittest.cc b/ui/base/win/osk_display_manager_unittest.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dcab36f8df50802d20e1415e0c5b56f0e16e66b6
--- /dev/null
+++ b/ui/base/win/osk_display_manager_unittest.cc
@@ -0,0 +1,35 @@
+// Copyright 2016 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 "ui/base/win/osk_display_manager.h"
+
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
+#include "base/logging.h"
+#include "base/macros.h"
+#include "base/strings/string16.h"
+#include "testing/gtest/include/gtest/gtest.h"
+
+// This test validates the on screen keyboard path (TabTip.exe) which is read
+// from the registry.
+TEST(OnScreenKeyboardTest, OSKPath) {
+  ui::OnScreenKeyboardDisplayManager* keyboard_display_manager =
+      ui::OnScreenKeyboardDisplayManager::GetInstance();
+  EXPECT_NE(nullptr, keyboard_display_manager);
+
+  base::string16 osk_path;
+  EXPECT_TRUE(keyboard_display_manager->GetOSKPath(&osk_path));
+
+  // The path read from the registry can be quoted. To check for the existence
+  // of the file we use the base::PathExists function which internally uses the
+  // GetFileAttributes API which does not accept quoted strings. Our workaround
+  // is to look for quotes in the first and last position in the string and
+  // erase them.
+  if (osk_path.front() == L'"') {

[sky, 2016/05/24 21:41:26]

You should check the size too (otherwise 31 may crash).

[ananta, 2016/05/24 22:09:33]

Added some more checks above this if which removes the need to check the size.

+    osk_path.erase(0, 1);                 // erase the first character.
+    osk_path.erase(osk_path.size() - 1);  // erase the last character.

[sky, 2016/05/24 21:41:26]

Can this be simplified to:
osk_path = osk_path.substr(1, os_path.size() - 2) ?

[ananta, 2016/05/24 22:09:33]

Done.

+  }
+
+  EXPECT_TRUE(base::PathExists(base::FilePath(osk_path)));
+}