Added the infrastructure for surfaceProxy.onResize() and SurfaceView.onResize()

extensions/common/guest_view/guest_view_constants.h

 // Copyright 2014 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 WebView API.
 
 #ifndef EXTENSIONS_COMMON_GUEST_VIEW_GUEST_VIEW_CONSTANTS_H_
 #define EXTENSIONS_COMMON_GUEST_VIEW_GUEST_VIEW_CONSTANTS_H_
 
 namespace guestview {
 
-// Sizing Attributes.
+// Sizing attributes/parameters.
 extern const char kAttributeAutoSize[];
 extern const char kAttributeMaxHeight[];
 extern const char kAttributeMaxWidth[];
 extern const char kAttributeMinHeight[];
 extern const char kAttributeMinWidth[];
+extern const char kElementWidth[];
+extern const char kElementHeight[];
+
+// Events.
+extern const char kEventResize[];
 
 // Parameters/properties on events.
 extern const char kIsTopLevel[];
+extern const char kNewWidth[];
+extern const char kNewHeight[];
+extern const char kOldWidth[];
+extern const char kOldHeight[];
 extern const char kReason[];
 extern const char kUrl[];
 extern const char kUserGesture[];
 
 // Initialization parameters.
 extern const char kParameterApi[];
 extern const char kParameterInstanceId[];
 
 // Other.
 extern const char kGuestViewManagerKeyName[];
 extern const int kInstanceIDNone;
 
 }  // namespace guestview
 
 #endif  // EXTENSIONS_COMMON_GUEST_VIEW_GUEST_VIEW_CONSTANTS_H_