fix navscreen animation

Prevent image from jumping when coming out of navscreen
by using the visible title height as the target top.
Note: there is still a little jump animating to the nav screen
this will be fixed by a different CL

Change-Id: Id85995e43253579754a8f214fb8596dcd77e7240
diff --git a/src/com/android/browser/PhoneUi.java b/src/com/android/browser/PhoneUi.java
index 4da0668..1bc0f77 100644
--- a/src/com/android/browser/PhoneUi.java
+++ b/src/com/android/browser/PhoneUi.java
@@ -434,7 +434,7 @@
         mNavScreen.mScroller.finishScroller();
         ImageView target = tabview.mImage;
         int toLeft = 0;
-        int toTop = getTitleBar().getHeight();
+        int toTop = (tab.getWebView() != null) ? tab.getWebView().getVisibleTitleHeight() : 0;
         int toRight = mContentView.getWidth();
         int width = target.getDrawable().getIntrinsicWidth();
         int height = target.getDrawable().getIntrinsicHeight();