Hook up SetInstantPreviewHeight for ChromeOS.

chrome/browser/ui/browser_window.h

Index: chrome/browser/ui/browser_window.h
diff --git a/chrome/browser/ui/browser_window.h b/chrome/browser/ui/browser_window.h
index efa96cab66a5f9c88053005992582ec37327b7f2..54fe4840e7fd4f26c4c53f1f75801c39dac0d8eb 100644
--- a/chrome/browser/ui/browser_window.h
+++ b/chrome/browser/ui/browser_window.h
@@ -326,9 +326,14 @@ class BrowserWindow : public BaseWindow {
   // Invoked when instant's tab contents should be shown.
   virtual void ShowInstant(TabContents* preview) = 0;
 
-  // Invoked when the instant's tab contents should be hidden.
+  // Invoked when instant's tab contents should be hidden.
   virtual void HideInstant() = 0;
 
+  // Resizes the Instant preview. If |is_percent| is true, then |value| is a
+  // percentage of the available content height in [0, 100], otherwise |value|
+  // is the desired height in pixels.
+  virtual void SetInstantPreviewHeight(int value, bool is_percent) = 0;
+
   // Returns the desired bounds for instant in screen coordinates. Note that if
   // instant isn't currently visible this returns the bounds instant would be
   // placed at.