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..72799c72dee892adb2c1410e5891619765b4ecda 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;
@@ -275,6 +278,13 @@ class InstantController : public InstantLoaderDelegate {
   // up in autocomplete history matches.
   GURL url_for_history_;
 
+  // Desired height for the Instant page. Used in extended mode to show Instant
+  // at the top of the window and other stuff beneath it.
+  int preview_height_;
+
+  // Units for |preview_height_|.
+  InstantSizeUnits preview_height_units_;
+
   DISALLOW_COPY_AND_ASSIGN(InstantController);
 };