Fix up bookmarks bar folders to always be scrolled to the top when they are opened.

chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm
diff --git a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm
index b59b0e7829d0be9250136344ea6851260b6a3afb..d210b5870c2acf13397f0f62f4fc5ed36ede4d42 100644
--- a/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm
+++ b/chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm
@@ -787,6 +787,7 @@ struct LayoutMetrics {
   CGFloat windowWidth = buttonWidth + padding_;
   NSPoint newWindowTopLeft = [self windowTopLeftForWidth:windowWidth
                                                   height:height];
+
   // Make sure as much of a submenu is exposed (which otherwise would be a
   // problem if the parent button is close to the bottom of the screen).
   if ([parentController_ isKindOfClass:[self class]]) {
@@ -795,16 +796,26 @@ struct LayoutMetrics {
                        height;
     newWindowTopLeft.y = MAX(newWindowTopLeft.y, minimumY);
   }
+
   NSWindow* window = [self window];
   NSRect windowFrame = NSMakeRect(newWindowTopLeft.x,
                                   newWindowTopLeft.y - height,
                                   windowWidth, height);
   [window setFrame:windowFrame display:NO];
+
   NSRect folderFrame = NSMakeRect(0, 0, windowWidth, height);
   [folderView_ setFrame:folderFrame];
+
+  // For some reason, when opening a "large" bookmark folder (containing 12 or
+  // more items) using the keyboard, the scroll view seems to want to be
+  // offset by default: [ http://crbug.com/101099 ].  Explicitly reseting the
+  // scroll position here is a bit hacky, but it does seem to work.
+  [[scrollView_ contentView] scrollToPoint:NSMakePoint(0, 0)];
+
   NSSize newSize = NSMakeSize(windowWidth, 0.0);
   [self adjustWindowLeft:newWindowTopLeft.x size:newSize scrollingBy:0.0];
   [self configureWindowLevel];
+
   [window display];
 }