Re-land alexbost's experimental offscreenTabs API.

chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_constants.cc

+// 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.
+
+#include "chrome/browser/extensions/api/offscreen_tabs/offscreen_tabs_constants.h"
+
+namespace extensions {
+namespace offscreen_tabs_constants {
+
+const char kEventTypeKey[] = "type";
+const char kEventAltKeyKey[] = "altKey";
+const char kEventCtrlKeyKey[] = "ctrlKey";
+const char kEventMetaKeyKey[] = "metaKey";
+const char kEventShiftKeyKey[] = "shiftKey";
+
+const char kMouseEventButtonKey[] = "button";
+const char kMouseEventWheelDeltaXKey[] = "wheelDeltaX";
+const char kMouseEventWheelDeltaYKey[] = "wheelDeltaY";
+
+const char kMouseEventTypeValueMousedown[] = "mousedown";
+const char kMouseEventTypeValueMouseup[] = "mouseup";
+const char kMouseEventTypeValueClick[] = "click";
+const char kMouseEventTypeValueMousemove[] = "mousemove";
+const char kMouseEventTypeValueMousewheel[] = "mousewheel";
+const int kMouseEventButtonValueLeft = 0;
+const int kMouseEventButtonValueMiddle = 1;
+const int kMouseEventButtonValueRight = 2;
+
+const char kKeyboardEventCharCodeKey[] = "charCode";
+const char kKeyboardEventKeyCodeKey[] = "keyCode";
+
+const char kKeyboardEventTypeValueKeypress[] = "keypress";
+const char kKeyboardEventTypeValueKeydown[] = "keydown";
+const char kKeyboardEventTypeValueKeyup[] = "keyup";
+
+const char kCurrentTabNotFound[]  = "No current tab found";
+const char kInvalidKeyboardEventObjectError[] =
+    "Invalid or unexpected KeyboardEvent object";
+const char kInvalidMouseEventObjectError[] =
+    "Invalid or unexpected MouseEvent object";
+const char kNoMouseCoordinatesError[] = "No mouse coordinates specified";
+const char kOffscreenTabNotFoundError[] = "No offscreen tab with id: *.";
+
+}  // namespace offscreen_Tabs_constants
+}  // namespace extensions