[Mac][Material Design] Fix regression with initial bookmark bar text.

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

 // Copyright (c) 2011 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_toolbar_view.h"
 
 #include "chrome/browser/search/search.h"
 #include "chrome/browser/themes/theme_properties.h"
 #include "chrome/browser/themes/theme_service.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_constants.h"
 #import "chrome/browser/ui/cocoa/bookmarks/bookmark_bar_controller.h"
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #include "skia/ext/skia_utils_mac.h"
 #import "ui/base/cocoa/nsview_additions.h"
 #include "ui/base/theme_provider.h"
 #include "ui/gfx/canvas_skia_paint.h"
 #include "ui/gfx/geometry/rect.h"
 #include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
 
 @interface BookmarkBarToolbarView (Private)
 - (void)drawAsDetachedBubble:(NSRect)dirtyRect;
 @end
 
 @implementation BookmarkBarToolbarView
 
 - (BOOL)isOpaque {
-  return [controller_ isInState:BookmarkBar::DETACHED];
+  // -drawRect: calls -drawAsDetachedBubble: or -drawBackground:, both of which
+  // fill the dirty rect with an opaque color.
+  return YES;
 }
 
 - (void)resetCursorRects {
   NSCursor *arrow = [NSCursor arrowCursor];
   [self addCursorRect:[self visibleRect] cursor:arrow];
   [arrow setOnMouseEntered:YES];
 }
 
 - (void)drawRect:(NSRect)dirtyRect {
   if ([controller_ isInState:BookmarkBar::DETACHED] ||
@@ skipping 43 matching lines @@
     strokeColor = [[self strokeColor] blendedColorWithFraction:morph
                                                        ofColor:strokeColor];
     strokeColor = [strokeColor colorWithAlphaComponent:0.5];
     [strokeColor set];
     NSRectFillUsingOperation(NSIntersectionRect(strokeRect, dirtyRect),
                              NSCompositeSourceOver);
   }
 }
 
 @end  // @implementation BookmarkBarToolbarView