The bookmark folder menus look bad when squeezed up against the bottom of a s...

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

Index: chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm
===================================================================
--- chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm	(revision 75353)
+++ chrome/browser/ui/cocoa/bookmarks/bookmark_bar_folder_controller.mm	(working copy)
@@ -458,7 +458,8 @@
 // coordinates).  The top left is positioned in a manner similar to
 // cascading menus.  Windows may grow to either the right or left of
 // their parent (if a sub-folder) so we need to know |windowWidth|.
-- (NSPoint)windowTopLeftForWidth:(int)windowWidth {
+- (NSPoint)windowTopLeftForWidth:(int)windowWidth height:(int)windowHeight {
+  CGFloat kMinSqueezedMenuHeight = bookmarks::kBookmarkFolderButtonHeight * 2.0;
   NSPoint newWindowTopLeft;
   if (![parentController_ isKindOfClass:[self class]]) {
     // If we're not popping up from one of ourselves, we must be
@@ -485,6 +486,18 @@
       newWindowTopLeft.x = std::max(newWindowTopLeft.x - spillOff,
                                     NSMinX(screenFrame));
     }
+    // The menu looks bad when it is squeezed up against the bottom of the
+    // screen and ends up being only a few pixels tall. If it meets the
+    // threshold for this case, instead show the menu above the button.
+    NSRect visFrame = [[[parentButton_ window] screen] visibleFrame];
+    CGFloat availableVerticalSpace = newWindowTopLeft.y -
+        (NSMinY(visFrame) + bookmarks::kScrollWindowVerticalMargin);
+    if ((availableVerticalSpace < kMinSqueezedMenuHeight) &&
+        (windowHeight > availableVerticalSpace)) {
+      newWindowTopLeft.y = std::min(
+          newWindowTopLeft.y + windowHeight + NSHeight([parentButton_ frame]),
+          NSMaxY(visFrame));
+    }
   } else {
     // Parent is a folder: expose as much as we can vertically; grow right/left.
     newWindowTopLeft.x = [self childFolderWindowLeftForWidth:windowWidth];
@@ -702,7 +715,8 @@
   folderFrame.size.height += deltaMenuHeight;
   [folderView_ setFrameSize:folderFrame.size];
   CGFloat windowWidth = [self adjustButtonWidths] + padding_;
-  NSPoint newWindowTopLeft = [self windowTopLeftForWidth:windowWidth];
+  NSPoint newWindowTopLeft = [self windowTopLeftForWidth:windowWidth
+                                                  height:deltaMenuHeight];
   CGFloat left = newWindowTopLeft.x;
   NSSize newSize = NSMakeSize(windowWidth, deltaMenuHeight);
   [self adjustWindowLeft:left size:newSize scrollingBy:0.0];
@@ -762,7 +776,8 @@
   // base the window width on this ideal button width.
   CGFloat buttonWidth = [self adjustButtonWidths];
   CGFloat windowWidth = buttonWidth + padding_;
-  NSPoint newWindowTopLeft = [self windowTopLeftForWidth:windowWidth];
+  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]]) {