Add a mimeHandler extension API.

extensions/common/constants.h

 // 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.
 
 #ifndef EXTENSIONS_COMMON_CONSTANTS_H_
 #define EXTENSIONS_COMMON_CONSTANTS_H_
 
 #include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "ui/base/layout.h"
@@ skipping 190 matching lines @@
   // ExtensionAction SetIcon function arguments.
   const char* const size_string;
   // Scale factor for which the representation should be used.
   const ui::ScaleFactor scale;
 };
 
 // The icon representations for extension actions.
 extern const IconRepresentationInfo kExtensionActionIconSizes[];
 const size_t kNumExtensionActionIconSizes = 2u;
 
+// The extension id of the PDF extension.
+extern const char kPdfExtensionId[];
+
+// The extension id of the Office Viewer component extension.
+extern const char kQuickOfficeComponentExtensionId[];
+
+// The extension id of the Office Viewer extension on the internal webstore.
+extern const char kQuickOfficeInternalExtensionId[];
+
+// The extension id of the Office Viewer extension.
+extern const char kQuickOfficeExtensionId[];
+
+// The extension id used for testing mimeHandlerPrivate.
+extern const char kMimeHandlerPrivateTestExtensionId[];
+
 }  // namespace extension_misc
 
 #endif  // EXTENSIONS_COMMON_CONSTANTS_H_