[rAC, OSX] Use a bubble for tooltips.

chrome/browser/ui/cocoa/autofill/autofill_bubble_controller.h

Index: chrome/browser/ui/cocoa/autofill/autofill_bubble_controller.h
diff --git a/chrome/browser/ui/cocoa/autofill/autofill_bubble_controller.h b/chrome/browser/ui/cocoa/autofill/autofill_bubble_controller.h
index ebdbfd138da00e9aa51a1541bc19f0fe77a01f48..273288243752178135d1c774ec427b3ca750d6c9 100644
--- a/chrome/browser/ui/cocoa/autofill/autofill_bubble_controller.h
+++ b/chrome/browser/ui/cocoa/autofill/autofill_bubble_controller.h
@@ -12,7 +12,9 @@
 
 // Bubble controller for field validation error bubbles.
 @interface AutofillBubbleController : BaseBubbleController {
+ @private
    base::scoped_nsobject<NSTextField> label_;
+   NSSize inset_;  // Amount the label is inset from the window.
 }
 
 // Creates an error bubble with the given |message|. You need to call
@@ -21,6 +23,12 @@
 - (id)initWithParentWindow:(NSWindow*)parentWindow
                    message:(NSString*)message;
 
+// Designated initializer. Creates a bubble with given |message| and insets the
+// text content by |inset|.
+- (id)initWithParentWindow:(NSWindow*)parentWindow
+                   message:(NSString*)message
+                     inset:(NSSize)inset;
+
 // Maximum width that the bubble will occupy, regardless of message size.
 - (CGFloat)maxWidth;