Hook up SetInstantPreviewHeight for ChromeOS.

chrome/browser/ui/views/frame/contents_container.h

Index: chrome/browser/ui/views/frame/contents_container.h
diff --git a/chrome/browser/ui/views/frame/contents_container.h b/chrome/browser/ui/views/frame/contents_container.h
index 61a59a39ddc53da592087afbcfe6290dc4f31f4e..114e76c4ea1d3a0cfecf494966966300d29574d1 100644
--- a/chrome/browser/ui/views/frame/contents_container.h
+++ b/chrome/browser/ui/views/frame/contents_container.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_
 #define CHROME_BROWSER_UI_VIEWS_FRAME_CONTENTS_CONTAINER_H_
 
+#include "chrome/common/instant_types.h"
 #include "ui/views/view.h"
 
 namespace content {
@@ -45,6 +46,11 @@ class ContentsContainer : public views::View {
   void SetPreview(views::WebView* preview,
                   content::WebContents* preview_web_contents);
   views::WebView* preview() { return preview_; }
+
+  // Sets the height of the preview. The default height is 100%, and each time
+  // the preview is cleared, the default is restored.
+  void SetPreviewHeight(int height, InstantSizeUnits units);
+
   content::WebContents* preview_web_contents() const {
     return preview_web_contents_;
   }
@@ -66,10 +72,17 @@ class ContentsContainer : public views::View {
   views::WebView* preview_;
   content::WebContents* preview_web_contents_;
 
+  // Returns the current preview height, in pixels.
+  int PreviewHeightInPixels() const;
+
   // The margin between the top and the active view. This is used to make the
   // preview overlap the bookmark bar on the new tab page.
   int active_top_margin_;
 
+  // The desired height of the preview and units.
+  int preview_height_;
+  InstantSizeUnits preview_height_units_;
+
   DISALLOW_COPY_AND_ASSIGN(ContentsContainer);
 };