Changing URL bar constraints only calls performResize on Hidden <-> Both

third_party/WebKit/Source/web/WebViewImpl.cpp

Index: third_party/WebKit/Source/web/WebViewImpl.cpp
diff --git a/third_party/WebKit/Source/web/WebViewImpl.cpp b/third_party/WebKit/Source/web/WebViewImpl.cpp
index ab8025e66cc5816381fc962a8e66a62a0439bf61..72c1838a4e0a0c3089efe1bc05e2282724c0a6c4 100644
--- a/third_party/WebKit/Source/web/WebViewImpl.cpp
+++ b/third_party/WebKit/Source/web/WebViewImpl.cpp
@@ -1798,12 +1798,14 @@ void WebViewImpl::updateBrowserControlsState(WebBrowserControlsState constraint,
 
   browserControls().updateConstraintsAndState(constraint, current, animate);
 
-  // If the controls are going from a locked to an unlocked state, or
-  // vice-versa, then we need to force a recompute of the ICB size since that
-  // depends on the permitted browser controls state.
-  if (oldPermittedState != constraint &&
-      (oldPermittedState == WebBrowserControlsBoth ||
-       constraint == WebBrowserControlsBoth)) {
+  // If the controls are going from a locked hidden to unlocked state, or vice
+  // versa, the ICB size needs to change but we can't rely on getting a
+  // WebViewImpl::resize since the top controls shown state may not have
+  // changed.
+  if ((oldPermittedState == WebBrowserControlsHidden &&
+       constraint == WebBrowserControlsBoth) ||
+      (oldPermittedState == WebBrowserControlsBoth &&
+       constraint == WebBrowserControlsHidden)) {
     performResize();
   }