Add Panel::SetPanelBoundsInstantly for all platforms.

chrome/browser/ui/panels/panel_browser_window_cocoa_unittest.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/panels/panel_browser_window_cocoa.h"
 
 #include <Carbon/Carbon.h>
 #import <Cocoa/Cocoa.h>
 
 #include "base/command_line.h"
@@ skipping 237 matching lines @@
   // Now resize the Panel, see that titlebar follows.
   const int kDelta = 153;  // random number
   gfx::Rect bounds = panel->GetBounds();
   // Grow panel in a way so that its titlebar moves and grows.
   bounds.set_x(bounds.x() - kDelta);
   bounds.set_y(bounds.y() - kDelta);
   bounds.set_width(bounds.width() + kDelta);
   bounds.set_height(bounds.height() + kDelta);
 
   PanelAnimatedBoundsObserver bounds_observer(panel);
-  native_window->SetPanelBounds(bounds);
+  native_window->SetPanelBounds(bounds, true);  // use animation.
   bounds_observer.Wait();
 
   // Verify the panel resized.
   NSRect window_frame = [[native_window->controller_ window] frame];
   EXPECT_EQ(NSWidth(window_frame), bounds.width());
   EXPECT_EQ(NSHeight(window_frame), bounds.height());
 
   // Verify the titlebar is still on top of regular titlebar.
   VerifyTitlebarLocation(contentView, titlebar);
 
@@ skipping 130 matching lines @@
   NSWindow* frontmostWindow = [[NSApp orderedWindows] objectAtIndex:0];
   EXPECT_NSEQ(frontmostWindow, [native_window->controller_ window]);
 
   native_window2->ActivatePanel();
   frontmostWindow = [[NSApp orderedWindows] objectAtIndex:0];
   EXPECT_NSEQ(frontmostWindow, [native_window2->controller_ window]);
 
   ClosePanelAndWait(panel->browser());
   ClosePanelAndWait(panel2->browser());
 }