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diff --git a/chrome/renderer/mock_keyboard.h b/chrome/renderer/mock_keyboard.h
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+// Copyright (c) 2009 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.
+
+#ifndef CHROME_RENDERER_MOCK_KEYBOARD_H_
+#define CHROME_RENDERER_MOCK_KEYBOARD_H_
+
+#include <string>
+
+#include "base/basictypes.h"
+
+#if defined(OS_WIN)
+#include "chrome/renderer/mock_keyboard_driver_win.h"
+#endif
+
+// A mock keyboard interface.
+// This class defines a pseudo keyboard device, which implements mappings from
+// a tuple (layout, key code, modifiers) to Unicode characters so that
+// engineers can write RenderViewTest cases without taking care of such
+// mappings. (This mapping is not trivial when using non-US keyboards.)
+// A pseudo keyboard device consists of two parts: a platform-independent part
+// and a platform-dependent part. This class implements the platform-independent
+// part. The platform-dependet part is implemented in the MockKeyboardWin class.
+// This class is usually called from RenderViewTest::SendKeyEvent().
+class MockKeyboard {
+ public:
+  // Represents keyboard-layouts.
+  enum Layout {
+    LAYOUT_NULL,
+    LAYOUT_ARABIC,
+    LAYOUT_BULGARIAN,
+    LAYOUT_CHINESE_TRADITIONAL,
+    LAYOUT_CZECH,
+    LAYOUT_DANISH,
+    LAYOUT_GERMAN,
+    LAYOUT_GREEK,
+    LAYOUT_UNITED_STATES,
+    LAYOUT_SPANISH,
+    LAYOUT_FINNISH,
+    LAYOUT_FRENCH,
+    LAYOUT_HEBREW,
+    LAYOUT_HUNGARIAN,
+    LAYOUT_ICELANDIC,
+    LAYOUT_ITALIAN,
+    LAYOUT_JAPANESE,
+    LAYOUT_KOREAN,
+    LAYOUT_POLISH,
+    LAYOUT_PORTUGUESE_BRAZILIAN,
+    LAYOUT_ROMANIAN,
+    LAYOUT_RUSSIAN,
+    LAYOUT_CROATIAN,
+    LAYOUT_SLOVAK,
+    LAYOUT_THAI,
+    LAYOUT_SWEDISH,
+    LAYOUT_TURKISH_Q,
+    LAYOUT_VIETNAMESE,
+    LAYOUT_DEVANAGARI_INSCRIPT,
+    LAYOUT_PORTUGUESE,
+    LAYOUT_UNITED_STATES_DVORAK,
+    LAYOUT_CANADIAN_FRENCH,
+  };
+
+  // Enumerates keyboard modifiers.
+  // These modifiers explicitly distinguish left-keys and right-keys because we
+  // should emulate AltGr (right-alt) key, used by many European keyboards to
+  // input alternate graph characters.
+  enum Modifiers {
+    INVALID = -1,
+    NONE = 0,
+    LEFT_SHIFT = 1 << 0,
+    LEFT_CONTROL = 1 << 1,
+    LEFT_ALT = 1 << 2,
+    LEFT_META = 1 << 3,
+    RIGHT_SHIFT = 1 << 4,
+    RIGHT_CONTROL = 1 << 5,
+    RIGHT_ALT = 1 << 6,
+    RIGHT_META = 1 << 7,
+    KEYPAD = 1 << 8,
+    AUTOREPEAAT = 1 << 9,
+  };
+
+  MockKeyboard();
+  ~MockKeyboard();
+
+  // Retrieves Unicode characters composed from the the specified keyboard
+  // layout, key code, and modifiers, i.e. characters returned when we type
+  // specified keys on a specified layout.
+  // This function returns the length of Unicode characters filled in the
+  // |output| parameter.
+  int GetCharacters(Layout layout,
+                    int key_code,
+                    Modifiers modifiers,
+                    std::wstring* output);
+
+ private:
+  Layout keyboard_layout_;
+  Modifiers keyboard_modifiers_;
+
+#if defined(OS_WIN)
+  MockKeyboardDriverWin driver_;
+#endif
+
+  DISALLOW_COPY_AND_ASSIGN(MockKeyboard);
+};
+
+#endif  // CHROME_RENDERER_MOCK_KEYBOARD_H_