Re-land alexbost's experimental Offscreen Tabs API work.

chrome/browser/extensions/extension_offscreen_tabs_module_constants.h

Index: chrome/browser/extensions/extension_offscreen_tabs_module_constants.h
diff --git a/chrome/browser/extensions/extension_offscreen_tabs_module_constants.h b/chrome/browser/extensions/extension_offscreen_tabs_module_constants.h
new file mode 100644
index 0000000000000000000000000000000000000000..a872973cd3229697c3898b5d8ccbdb8227a27028
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+++ b/chrome/browser/extensions/extension_offscreen_tabs_module_constants.h
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+// Copyright (c) 2012 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.
+
+// Constants used for the Offscreen Tabs API.
+
+#ifndef CHROME_BROWSER_EXTENSIONS_EXTENSION_OFFSCREEN_TABS_MODULE_CONSTANTS_H_
+#define CHROME_BROWSER_EXTENSIONS_EXTENSION_OFFSCREEN_TABS_MODULE_CONSTANTS_H_
+#pragma once
+
+namespace extension_offscreen_tabs_module_constants {
+
+// all input event keys
+extern const char kEventTypeKey[];
+extern const char kEventAltKeyKey[];
+extern const char kEventCtrlKeyKey[];
+extern const char kEventMetaKeyKey[];
+extern const char kEventShiftKeyKey[];
+
+// mouse keys
+extern const char kMouseEventTypeKey[];
+extern const char kMouseEventButtonKey[];
+extern const char kMouseEventWheelDeltaXKey[];
+extern const char kMouseEventWheelDeltaYKey[];
+
+// mouse values
+extern const char kMouseEventTypeValueMousedown[];
+extern const char kMouseEventTypeValueMouseup[];
+extern const char kMouseEventTypeValueClick[];
+extern const char kMouseEventTypeValueMousemove[];
+extern const char kMouseEventTypeValueMousewheel[];
+extern const int kMouseEventButtonValueLeft;
+extern const int kMouseEventButtonValueMiddle;
+extern const int kMouseEventButtonValueRight;
+
+// keyboard keys
+extern const char kKeyboardEventTypeKey[];
+extern const char kKeyboardEventCharCodeKey[];
+extern const char kKeyboardEventKeyCodeKey[];
+
+// keyboard values
+extern const char kKeyboardEventTypeValueKeypress[];
+extern const char kKeyboardEventTypeValueKeydown[];
+extern const char kKeyboardEventTypeValueKeyup[];
+
+// events
+extern const char kDispatchEvent[];
+extern const char kEventOnUpdated[];
+
+// errors
+extern const char kCurrentTabNotFound[];
+extern const char kInvalidKeyboardEventObjectError[];
+extern const char kInvalidMouseEventObjectError[];
+extern const char kNoMouseCoordinatesError[];
+extern const char kOffscreenTabNotFoundError[];
+
+};  // namespace extension_offscreen_tabs_module_constants
+
+#endif  // CHROME_BROWSER_EXTENSIONS_EXTENSION_OFFSCREEN_TABS_MODULE_CONSTANTS_H_
+