Hook up SetInstantPreviewHeight for ChromeOS.

chrome/browser/instant/instant_controller.h

Index: chrome/browser/instant/instant_controller.h
diff --git a/chrome/browser/instant/instant_controller.h b/chrome/browser/instant/instant_controller.h
index d2510e49414c8cbba18a91452fad8fba4bea810c..6ba4ebf37677ed5e05d9d6fc05b176b4309c99de 100644
--- a/chrome/browser/instant/instant_controller.h
+++ b/chrome/browser/instant/instant_controller.h
@@ -156,6 +156,9 @@ class InstantController : public InstantLoaderDelegate {
       InstantLoader* loader,
       const std::vector<InstantSuggestion>& suggestions) OVERRIDE;
   virtual void CommitInstantLoader(InstantLoader* loader) OVERRIDE;
+  virtual void SetInstantPreviewHeight(InstantLoader* loader,
+                                       int height,
+                                       InstantSizeUnits units) OVERRIDE;
   virtual void InstantLoaderPreviewLoaded(InstantLoader* loader) OVERRIDE;
   virtual void InstantSupportDetermined(InstantLoader* loader,
                                         bool supports_instant) OVERRIDE;
@@ -193,8 +196,9 @@ class InstantController : public InstantLoaderDelegate {
   // Destroys the |loader_| and its preview contents.
   void DeleteLoader();
 
-  // Counterpart to Hide(). Asks the |delegate_| to display the preview.
-  void Show();
+  // Counterpart to Hide(). Asks the |delegate_| to display the preview with
+  // the given |height|.
+  void Show(int height, InstantSizeUnits units);
 
   // Send the omnibox dropdown bounds to the page.
   void SendBoundsToPage();