[Mac] Show a warning in the new avatar button/menu if there's an auth error

chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm

Index: chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
diff --git a/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm b/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
index f8f8dfb31898127295d6306352b280550bff2ce5..4ccc85d9cb7541e5eb8bcd57dd09d62b5bb55f81 100644
--- a/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
+++ b/chrome/browser/ui/cocoa/profiles/avatar_base_controller.mm
@@ -11,6 +11,7 @@
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/profiles/profile_metrics.h"
 #include "chrome/browser/signin/signin_header_helper.h"
+#include "chrome/browser/profiles/profiles_state.h"
 #include "chrome/browser/ui/browser.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/browser_window.h"
@@ -18,6 +19,7 @@
 #import "chrome/browser/ui/cocoa/browser_window_controller.h"
 #import "chrome/browser/ui/cocoa/profiles/avatar_menu_bubble_controller.h"
 #import "chrome/browser/ui/cocoa/profiles/profile_chooser_controller.h"
+#include "components/signin/core/browser/signin_error_controller.h"
 #include "components/signin/core/common/profile_management_switches.h"
 #include "ui/base/resource/resource_bundle.h"
 
@@ -32,19 +34,34 @@ const CGFloat kMenuYOffsetAdjust = 1.0;
 // yes, then the BrowserWindowController is notified to relayout the subviews,
 // as the button needs to be repositioned.
 - (void)updateAvatarButtonAndLayoutParent:(BOOL)layoutParent;
+// Displays an error icon if any accounts associated with this profile have an
+// auth error.
+- (void)updateErrorStatus:(BOOL)hasError;
 @end
 
-class ProfileInfoUpdateObserver : public ProfileInfoCacheObserver {
+class ProfileInfoUpdateObserver : public ProfileInfoCacheObserver,
+                                  public SigninErrorController::Observer {
  public:
-  ProfileInfoUpdateObserver(AvatarBaseController* avatarButton)
-      : avatarButton_(avatarButton) {
+  ProfileInfoUpdateObserver(Profile* profile,
+                            AvatarBaseController* avatarButton)
+      : profile_(profile),
+        avatarButton_(avatarButton) {
     g_browser_process->profile_manager()->
         GetProfileInfoCache().AddObserver(this);
+
+    // Subscribe to authentication error changes so that the avatar button
+    // can update itself.
+    SigninErrorController* error = profiles::GetSigninErrorController(profile_);
+    if (error)
+      error->AddObserver(this);
   }
 
   virtual ~ProfileInfoUpdateObserver() {
     g_browser_process->profile_manager()->
         GetProfileInfoCache().RemoveObserver(this);
+    SigninErrorController* error = profiles::GetSigninErrorController(profile_);
+    if (error)
+      error->RemoveObserver(this);
   }
 
   // ProfileInfoCacheObserver:
@@ -69,7 +86,15 @@ class ProfileInfoUpdateObserver : public ProfileInfoCacheObserver {
     [avatarButton_ updateAvatarButtonAndLayoutParent:YES];
   }
 
+  // SigninErrorController::Observer:
+  virtual void OnErrorChanged() OVERRIDE {
+    SigninErrorController* error = profiles::GetSigninErrorController(profile_);
+    if (error)
+      [avatarButton_ updateErrorStatus:error->HasError()];
+  }
+
  private:
+  Profile* profile_;
   AvatarBaseController* avatarButton_;  // Weak; owns this.
 
   DISALLOW_COPY_AND_ASSIGN(ProfileInfoUpdateObserver);
@@ -80,7 +105,8 @@ class ProfileInfoUpdateObserver : public ProfileInfoCacheObserver {
 - (id)initWithBrowser:(Browser*)browser {
   if ((self = [super init])) {
     browser_ = browser;
-    profileInfoObserver_.reset(new ProfileInfoUpdateObserver(self));
+    profileInfoObserver_.reset(
+        new ProfileInfoUpdateObserver(browser_->profile(), self));
   }
   return self;
 }
@@ -170,6 +196,9 @@ class ProfileInfoUpdateObserver : public ProfileInfoCacheObserver {
   NOTREACHED();
 }
 
+- (void)updateErrorStatus:(BOOL)hasError {
+}
+
 - (BaseBubbleController*)menuController {
   return menuController_;
 }