Stretching NativeViewHost, and misc tab capture fixes.

chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm

Index: chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
diff --git a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
index f7b55825e0ed2cc0bf6c4327197ceacec888c2cf..60be441a839040543608243989312d965faebe7b 100644
--- a/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
+++ b/chrome/browser/ui/cocoa/location_bar/autocomplete_text_field_cell.mm
@@ -248,10 +248,10 @@ - (NSRect)frameForDecoration:(const LocationBarDecoration*)aDecoration
     return decorationFrames[index];
   }
 
-  // Decorations which are not visible should have been filtered out
-  // at the top, but return |NSZeroRect| rather than a 0-width rect
-  // for consistency.
-  NOTREACHED();
+  // Decorations which are not visible usually have been filtered out at the
+  // top. However, in some cases they are not (e.g., new tabs that have never
+  // been foregrounded). As a default, return |NSZeroRect| rather than a 0-width
+  // rect for consistency.
   return NSZeroRect;
 }