Add ManagePasswordsDecoration and unit tests.

chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.h

Index: chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.h
diff --git a/chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.h b/chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.h
new file mode 100644
index 0000000000000000000000000000000000000000..31dde0a14370c8e773082c3ef682c8d41bb1a93e
--- /dev/null
+++ b/chrome/browser/ui/cocoa/location_bar/manage_passwords_decoration.h
@@ -0,0 +1,41 @@
+// Copyright 2014 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.
+
+#ifndef CHROME_BROWSER_UI_COCOA_LOCATION_BAR_MANAGE_PASSWORDS_DECORATION_H_
+#define CHROME_BROWSER_UI_COCOA_LOCATION_BAR_MANAGE_PASSWORDS_DECORATION_H_
+
+#import <Cocoa/Cocoa.h>
+
+#include "base/compiler_specific.h"
+#include "chrome/browser/ui/cocoa/location_bar/image_decoration.h"
+#include "chrome/browser/ui/passwords/manage_passwords_icon.h"
+
+class CommandUpdater;
+
+// Manage passwords icon on the right side of the field. This appears when
+// password management is available on the current page.
+class ManagePasswordsDecoration : public ImageDecoration,
+                                  public ManagePasswordsIcon {

[rohitrao (ping after 24h), 2014/07/31 12:35:19]

The multiple inheritance bothers me (I think it's disallowed by the style
guide?).  Is there any way to do this through composition instead?  Can
|ManagePasswordsDecoration| own a |ManagePasswordsIcon| instead of subclassing,
without too much disruption?

[dconnelly, 2014/08/01 09:11:46]

Done. But this is a good example of the style guide being too harsh, as
ManagePasswordDecoration really is-a both of these things and involves creating
a new class that only delegates to this one :)

+ public:
+  explicit ManagePasswordsDecoration(CommandUpdater* command_updater);
+  virtual ~ManagePasswordsDecoration();
+
+  // Implement |LocationBarDecoration|
+  virtual bool AcceptsMousePress() OVERRIDE;
+  virtual bool OnMousePressed(NSRect frame, NSPoint location) OVERRIDE;
+  virtual NSString* GetToolTip() OVERRIDE;
+  virtual NSPoint GetBubblePointInFrame(NSRect frame) OVERRIDE;
+
+ protected:
+  // Implement |ManagePasswordsIcon|
+  virtual void UpdateVisibleUI() OVERRIDE;
+
+ private:
+  // Shows the manage passwords bubble.
+  CommandUpdater* command_updater_;  // Weak, owned by Browser.
+
+  DISALLOW_COPY_AND_ASSIGN(ManagePasswordsDecoration);
+};
+
+#endif  // CHROME_BROWSER_UI_COCOA_LOCATION_BAR_MANAGE_PASSWORDS_DECORATION_H_