Hook up SetInstantPreviewHeight for ChromeOS.

chrome/browser/instant/instant_loader_delegate.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 CHROME_BROWSER_INSTANT_INSTANT_LOADER_DELEGATE_H_
 #define CHROME_BROWSER_INSTANT_INSTANT_LOADER_DELEGATE_H_
 
 #include <vector>
 
 #include "chrome/common/instant_types.h"
 
 class InstantLoader;
 
 // InstantLoader calls these methods on its delegate (InstantController)
 // to notify it of interesting events happening on the Instant preview.
 class InstantLoaderDelegate {
  public:
   // Invoked when the loader has suggested text.
   virtual void SetSuggestions(
       InstantLoader* loader,
       const std::vector<InstantSuggestion>& suggestions) = 0;
 
   // Commit the preview.
   virtual void CommitInstantLoader(InstantLoader* loader) = 0;
 
+  // Resize the preview.
+  virtual void SetInstantPreviewHeight(InstantLoader* loader,
+                                       int height,
+                                       InstantSizeUnits units) = 0;
+
   // Notification that the first page load (of the Instant URL) completed.
   virtual void InstantLoaderPreviewLoaded(InstantLoader* loader) = 0;
 
   // Notification when the loader has determined whether or not the page
   // supports the Instant API.
   virtual void InstantSupportDetermined(InstantLoader* loader,
                                         bool supports_instant) = 0;
 
   // Notification that the loader swapped a different TabContents into the
   // preview, usually because a prerendered page was navigated to.
   virtual void SwappedTabContents(InstantLoader* loader) = 0;
 
   // Notification that the preview gained focus, usually due to the user
   // clicking on it.
   virtual void InstantLoaderContentsFocused(InstantLoader* loader) = 0;
 
  protected:
   virtual ~InstantLoaderDelegate() {}
 };
 
 #endif  // CHROME_BROWSER_INSTANT_INSTANT_LOADER_DELEGATE_H_