Use entry URLs instead of entry IDs to determine when to dismiss the overscroll overlay.

content/browser/web_contents/aura/overscroll_navigation_overlay.cc

Index: content/browser/web_contents/aura/overscroll_navigation_overlay.cc
diff --git a/content/browser/web_contents/aura/overscroll_navigation_overlay.cc b/content/browser/web_contents/aura/overscroll_navigation_overlay.cc
index eeb9d49f40303cb45e53e4c60984eb59d09627b1..8f7c14ec7044602ca35db961f04ec59ebd65ccac 100644
--- a/content/browser/web_contents/aura/overscroll_navigation_overlay.cc
+++ b/content/browser/web_contents/aura/overscroll_navigation_overlay.cc
@@ -21,6 +21,24 @@
 #include "ui/gfx/image/image_skia.h"
 
 namespace content {
+namespace {
+
+// Returns true if the entry's URL or any of the URLs in entry's redirect chain
+// match |url|.
+bool DoesEntryMatchURL(NavigationEntry* entry, const GURL& url) {
+  if (entry->GetURL() == url)
+    return true;
+  const std::vector<GURL>& redirect_chain = entry->GetRedirectChain();
+  for (std::vector<GURL>::const_iterator it = redirect_chain.begin();
+       it != redirect_chain.end();
+       it++) {
+    if (*it == url)
+      return true;
+  }
+  return false;
+}
+
+}  // namespace
 
 // A LayerDelegate that paints an image for the layer.
 class ImageLayerDelegate : public ui::LayerDelegate {
@@ -119,7 +137,6 @@ OverscrollNavigationOverlay::OverscrollNavigationOverlay(
       image_delegate_(NULL),
       loading_complete_(false),
       received_paint_update_(false),
-      pending_entry_id_(0),
       slide_direction_(SLIDE_UNKNOWN) {
 }
 
@@ -130,7 +147,6 @@ void OverscrollNavigationOverlay::StartObserving() {
   loading_complete_ = false;
   received_paint_update_ = false;
   overlay_dismiss_layer_.reset();
-  pending_entry_id_ = 0;
   Observe(web_contents_);
 
   // Make sure the overlay window is on top.
@@ -140,10 +156,10 @@ void OverscrollNavigationOverlay::StartObserving() {
   // Assumes the navigation has been initiated.
   NavigationEntry* pending_entry =
       web_contents_->GetController().GetPendingEntry();
-  // Save id of the pending entry to identify when it loads and paints later.
+  // Save url of the pending entry to identify when it loads and paints later.
   // Under some circumstances navigation can leave a null pending entry -
   // see comments in NavigationControllerImpl::NavigateToPendingEntry().
-  pending_entry_id_ = pending_entry ? pending_entry->GetUniqueID() : 0;
+  pending_entry_url_ = pending_entry ? pending_entry->GetURL() : GURL();
 }
 
 void OverscrollNavigationOverlay::SetOverlayWindow(
@@ -282,23 +298,21 @@ void OverscrollNavigationOverlay::OnWindowSliderDestroyed() {
 }
 
 void OverscrollNavigationOverlay::DidFirstVisuallyNonEmptyPaint() {
-  int visible_entry_id =
-      web_contents_->GetController().GetVisibleEntry()->GetUniqueID();
-  if (visible_entry_id == pending_entry_id_ || !pending_entry_id_) {
+  NavigationEntry* visible_entry =
+      web_contents_->GetController().GetVisibleEntry();
+  if (pending_entry_url_.is_empty() ||
+      DoesEntryMatchURL(visible_entry, pending_entry_url_)) {
     received_paint_update_ = true;
     StopObservingIfDone();
   }
 }
 
 void OverscrollNavigationOverlay::DidStopLoading(RenderViewHost* host) {
-  // Use the last committed entry rather than the active one, in case a
-  // pending entry has been created.
-  int committed_entry_id =
-      web_contents_->GetController().GetLastCommittedEntry()->GetUniqueID();
-  if (committed_entry_id == pending_entry_id_ || !pending_entry_id_) {
-    loading_complete_ = true;
-    StopObservingIfDone();
-  }
+  // Don't compare URLs in this case - it's possible they won't match if
+  // a gesture-nav initiated navigation was interrupted by some other in-site
+  // navigation ((e.g., from a script, or from a bookmark).
+  loading_complete_ = true;
+  StopObservingIfDone();
 }
 
 }  // namespace content