Do not capture screenshot for page reloads

- The browser captures screenshot bitmaps on page
  navigation. The page reload was also causing the
  capture, resulting into unnecessary captures.

Change-Id: Idd45799ed1dee74e790198fcf1d9f1d84c1fe367
diff --git a/src/com/android/browser/Tab.java b/src/com/android/browser/Tab.java
index a600fd3..1642568 100644
--- a/src/com/android/browser/Tab.java
+++ b/src/com/android/browser/Tab.java
@@ -660,7 +660,9 @@
                 return;
             }
 
-
+            if (view.getUrl().equals(url)) {
+                return;
+            }
 
             final int idx = view.copyBackForwardList().getCurrentIndex();
             boolean bitmapExists = view.hasSnapshot(idx);