Several background pattern fixes on the Mac....

chrome/browser/cocoa/background_gradient_view.h

Index: chrome/browser/cocoa/background_gradient_view.h
===================================================================
--- chrome/browser/cocoa/background_gradient_view.h	(revision 28537)
+++ chrome/browser/cocoa/background_gradient_view.h	(working copy)
@@ -10,7 +10,6 @@
 
 // A custom view that draws a 'standard' background gradient.
 // Base class for other Chromium views.
-
 @interface BackgroundGradientView : NSView {
  @private
   BOOL showsDivider_;
@@ -19,6 +18,10 @@
 // The color used for the bottom stroke. Public so subclasses can use.
 - (NSColor *)strokeColor;
 
+// Draws the background for this view. Make sure that your patternphase
+// is set up correctly in your graphics context before calling.
+- (void)drawBackground;
+
 // Controls whether the bar draws a dividing line at the bottom.
 @property(assign) BOOL showsDivider;
 @end