Implement smoother autosizing of the extension options overlay

chrome/browser/guest_view/extension_options/extension_options_guest.cc

 // 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.
 
 #include "chrome/browser/guest_view/extension_options/extension_options_guest.h"
 
 #include "base/values.h"
 #include "chrome/browser/extensions/chrome_extension_web_contents_observer.h"
 #include "chrome/browser/extensions/extension_tab_util.h"
 #include "chrome/browser/guest_view/extension_options/extension_options_constants.h"
@@ skipping 133 matching lines @@
 void ExtensionOptionsGuest::OnRequest(
     const ExtensionHostMsg_Request_Params& params) {
   extension_function_dispatcher_->Dispatch(
       params, guest_web_contents()->GetRenderViewHost());
 }
 
 void ExtensionOptionsGuest::GuestSizeChangedDueToAutoSize(
     const gfx::Size& old_size,
     const gfx::Size& new_size) {
   scoped_ptr<base::DictionaryValue> args(new base::DictionaryValue());
-  args->SetInteger(extensionoptions::kWidth, new_size.width());
-  args->SetInteger(extensionoptions::kHeight, new_size.height());
+  args->SetInteger(extensionoptions::kNewWidth, new_size.width());
+  args->SetInteger(extensionoptions::kNewHeight, new_size.height());
+  args->SetInteger(extensionoptions::kOldWidth, old_size.width());
+  args->SetInteger(extensionoptions::kOldHeight, old_size.height());
   DispatchEventToEmbedder(new extensions::GuestViewBase::Event(
       extension_options_internal::OnSizeChanged::kEventName, args.Pass()));
 }
 
 bool ExtensionOptionsGuest::IsAutoSizeSupported() const {
   return true;
 }
 
 void ExtensionOptionsGuest::SetUpAutoSize() {
   // Read the autosize parameters passed in from the embedder.
@@ skipping 43 matching lines @@
   content::OpenURLParams params(target_url,
                                 content::Referrer(),
                                 NEW_FOREGROUND_TAB,
                                 content::PAGE_TRANSITION_LINK,
                                 false);
   browser->OpenURL(params);
   // TODO(ericzeng): Open the tab in the background if the click was a
   //   ctrl-click or middle mouse button click
   return false;
 }