[Win] Allow using the arrow keys for tabbing in the avatar bubble.

BUG=414794

Review URL: https://codereview.chromium.org/591263002

Cr-Commit-Position: refs/heads/master@{#296189}

chrome/browser/ui/views/profiles/profile_chooser_view.cc

@@ -597,6 +597,10 @@ void ProfileChooserView::Init() {
     view_mode_ = profiles::BUBBLE_VIEW_MODE_ACCOUNT_MANAGEMENT;
   }
 
+  // The arrow keys can be used to tab between items.
+  AddAccelerator(ui::Accelerator(ui::VKEY_DOWN, ui::EF_NONE));
+  AddAccelerator(ui::Accelerator(ui::VKEY_UP, ui::EF_NONE));
+
   ShowView(view_mode_, avatar_menu_.get());
 }
 
@@ -697,6 +701,16 @@ void ProfileChooserView::WindowClosing() {
   }
 }
 
+bool ProfileChooserView::AcceleratorPressed(
+    const ui::Accelerator& accelerator) {
+  if (accelerator.key_code() != ui::VKEY_DOWN &&
+      accelerator.key_code() != ui::VKEY_UP)
+    return BubbleDelegateView::AcceleratorPressed(accelerator);
+  // Move the focus up or down.
+  GetFocusManager()->AdvanceFocus(accelerator.key_code() != ui::VKEY_DOWN);
+  return true;
+}
+
 void ProfileChooserView::ButtonPressed(views::Button* sender,
                                        const ui::Event& event) {
   // Disable button after clicking so that it doesn't get clicked twice and

chrome/browser/ui/views/profiles/profile_chooser_view.h

@@ -88,6 +88,7 @@ class ProfileChooserView : public views::BubbleDelegateView,
   // views::BubbleDelegateView:
   virtual void Init() OVERRIDE;
   virtual void WindowClosing() OVERRIDE;
+  virtual bool AcceleratorPressed(const ui::Accelerator& accelerator) OVERRIDE;
 
   // views::ButtonListener:
   virtual void ButtonPressed(views::Button* sender,