[rAC, OSX] Align bubble arrow based on location.

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

 // Copyright 2013 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/autofill/autofill_bubble_controller.h"
 
 #import "chrome/browser/ui/cocoa/autofill/autofill_dialog_constants.h"
 #import "chrome/browser/ui/cocoa/info_bubble_view.h"
 #import "chrome/browser/ui/cocoa/info_bubble_window.h"
 #include "skia/ext/skia_utils_mac.h"
 
 namespace {
 
 // Border inset for error label.
 const CGFloat kLabelInset = 3.0;
 
+const CGFloat kMaxLabelWidth =
+    2 * autofill::kFieldWidth + autofill::kHorizontalFieldPadding;
+
 }  // namespace
 
 
 @implementation AutofillBubbleController
 
 - (id)initWithParentWindow:(NSWindow*)parentWindow
                    message:(NSString*)message {
   base::scoped_nsobject<InfoBubbleWindow> window(
       [[InfoBubbleWindow alloc] initWithContentRect:NSMakeRect(0, 0, 200, 100)
                                           styleMask:NSBorderlessWindowMask
                                             backing:NSBackingStoreBuffered
                                               defer:NO]);
   [window setAllowedAnimations:info_bubble::kAnimateNone];
   if ((self = [super initWithWindow:window
                        parentWindow:parentWindow
                          anchoredAt:NSZeroPoint])) {
     [self setShouldOpenAsKeyWindow:NO];
     [[self bubble] setArrowLocation:info_bubble::kTopCenter];
     [[self bubble] setAlignment:info_bubble::kAlignArrowToAnchor];
 
     label_.reset([[NSTextField alloc] init]);
     [label_ setEditable:NO];
     [label_ setBordered:NO];
     [label_ setDrawsBackground:NO];
     [label_ setStringValue:message];
     NSSize labelSize = [[label_ cell] cellSizeForBounds:
-        NSMakeRect(
-            0, 0,
-            2 * autofill::kFieldWidth + autofill::kHorizontalFieldPadding,
-            CGFLOAT_MAX)];
+        NSMakeRect(0, 0, kMaxLabelWidth, CGFLOAT_MAX)];
     [label_ setFrameSize:labelSize];
     [label_ setFrameOrigin:NSMakePoint(kLabelInset, kLabelInset)];
 
     [[self bubble] addSubview:label_];
 
     NSRect windowFrame = [[self window] frame];
     windowFrame.size = NSMakeSize(
         NSMaxX([label_ frame]),
         NSHeight([label_ frame]) + info_bubble::kBubbleArrowHeight);
     windowFrame = NSInsetRect(windowFrame, -kLabelInset, -kLabelInset);
     [[self window] setFrame:windowFrame display:NO];
   }
   return self;
 }
 
+- (CGFloat)maxWidth {
+  return kMaxLabelWidth + 2 * kLabelInset;
+}
+
 @end