Hook up SetInstantPreviewHeight for ChromeOS.

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

Index: chrome/browser/ui/views/frame/contents_container.cc
diff --git a/chrome/browser/ui/views/frame/contents_container.cc b/chrome/browser/ui/views/frame/contents_container.cc
index 508fff9f24523528d3bd8804b09a49af50f3bfda..85ba03c82bd5c410c4528d232d8d763a436991c8 100644
--- a/chrome/browser/ui/views/frame/contents_container.cc
+++ b/chrome/browser/ui/views/frame/contents_container.cc
@@ -18,7 +18,8 @@ ContentsContainer::ContentsContainer(views::WebView* active)
       overlay_(NULL),
       preview_(NULL),
       preview_web_contents_(NULL),
-      active_top_margin_(0) {
+      active_top_margin_(0),
+      preview_height_(-1) {
   AddChildView(active_);
 }
 
@@ -84,6 +85,12 @@ gfx::Rect ContentsContainer::GetPreviewBounds() {
   return gfx::Rect(screen_loc, size());
 }
 
+void ContentsContainer::SetPreviewHeight(int value, bool is_percent) {
+  preview_height_ = is_percent ? (value * height()) / 100 : value;
+
+  Layout();
+}
+
 void ContentsContainer::Layout() {
   int content_y = active_top_margin_;
   int content_height = std::max(0, height() - content_y);
@@ -95,7 +102,9 @@ void ContentsContainer::Layout() {
     overlay_->SetBounds(0, 0, width(), height());
 
   if (preview_)
-    preview_->SetBounds(0, 0, width(), height());
+    preview_->SetBounds(0, 0, width(),
+                        (preview_height_ < 0 || preview_height_ > height() ?
+                         height() : preview_height_));
 
   // Need to invoke views::View in case any views whose bounds didn't change
   // still need a layout.