Implement basic theming for panel titlebars.

chrome/browser/ui/panels/panel_window_controller_cocoa.h

Index: chrome/browser/ui/panels/panel_window_controller_cocoa.h
diff --git a/chrome/browser/ui/panels/panel_window_controller_cocoa.h b/chrome/browser/ui/panels/panel_window_controller_cocoa.h
index 94df28d5650656d07b6fd555cb0caa9f7531de90..c9668d6f25edef1a38eb8292e30fc43ff1f9ea12 100644
--- a/chrome/browser/ui/panels/panel_window_controller_cocoa.h
+++ b/chrome/browser/ui/panels/panel_window_controller_cocoa.h
@@ -12,7 +12,9 @@
 #import <Cocoa/Cocoa.h>
 
 #import "base/mac/cocoa_protocols.h"
+#include "base/memory/scoped_nsobject.h"
 #include "base/memory/scoped_ptr.h"
+#import "chrome/browser/ui/cocoa/themed_window.h"
 
 @class FindBarCocoaController;
 class PanelBrowserWindowCocoa;
@@ -22,11 +24,16 @@ class PanelBrowserWindowCocoa;
  @private
   IBOutlet PanelTitlebarViewCocoa* titlebar_view_;
   scoped_ptr<PanelBrowserWindowCocoa> windowShim_;
+  scoped_nsobject<NSString> pendingWindowTitle_;
 }
 
 // Load the browser window nib and do any Cocoa-specific initialization.
 - (id)initWithBrowserWindow:(PanelBrowserWindowCocoa*)window;
 
+- (ui::ThemeProvider*)themeProvider;
+- (ThemedWindowStyle)themedWindowStyle;
+- (NSPoint)themePatternPhase;
+
 // Returns the TabContents' native view. It renders the content of the web page
 // in the Panel.
 - (NSView*)tabContentsView;
@@ -40,6 +47,8 @@ class PanelBrowserWindowCocoa;
 // Shows the window for the first time. Only happens once.
 - (void)revealAnimatedWithFrame:(const NSRect&)frame;
 
+- (void)updateTitleBar;
+
 // Adds the FindBar controller's view to this Panel. Must only be
 // called once per PanelWindowControllerCocoa.
 - (void)addFindBar:(FindBarCocoaController*)findBarCocoaController;