Make the shadow for the fullscreen exit bubble for mac more prominent.

chrome/browser/ui/cocoa/fullscreen_exit_bubble_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/fullscreen_exit_bubble_view.h"
+
+#include "base/memory/scoped_nsobject.h"
+#include "ui/gfx/scoped_ns_graphics_context_save_gstate_mac.h"
+
+namespace {
+
+const CGFloat kShadowTop = 20;
+const CGFloat kShadowBottom = 50;
+const CGFloat kShadowLeft = 50;
+const CGFloat kShadowRight = 50;
+const CGFloat kShadowBlurRadius = 290;
+const CGFloat kShadowAlpha = 0.5;
+const CGFloat kBubbleCornerRadius = 8.0;
+
+}
+
+@implementation FullscreenExitBubbleView
+
+- (void)drawRect:(NSRect)rect {
+  // Make room for the border to be seen.
+  NSRect bounds = [self bounds];
+  bounds.size.width -= kShadowLeft + kShadowRight;
+  bounds.size.height -= kShadowTop + kShadowBottom;
+  bounds.origin.x += kShadowLeft;
+  bounds.origin.y += kShadowBottom;
+  NSBezierPath* bezier = [NSBezierPath bezierPath];
+
+  CGFloat radius = kBubbleCornerRadius;
+  // Start with a rounded rectangle.
+  [bezier appendBezierPathWithRoundedRect:bounds
+                                  xRadius:radius
+                                  yRadius:radius];
+
+  [bezier closePath];
+  [[NSColor whiteColor] set];
+  gfx::ScopedNSGraphicsContextSaveGState scoped_g_state;
+  scoped_nsobject<NSShadow> shadow([[NSShadow alloc] init]);
+  [shadow setShadowBlurRadius:kShadowBlurRadius];
+  [shadow setShadowColor:[[NSColor blackColor]
+    colorWithAlphaComponent:kShadowAlpha]];
+  [shadow set];
+
+  [bezier fill];
+}
+
+@end