Bug fix: Combobox: Focus on clicking mouse button

ui/views/controls/combobox/combobox.cc

 // Copyright (c) 2012 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.
 
 #include "ui/views/controls/combobox/combobox.h"
 
 #include "base/bind.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop_proxy.h"
 #include "base/strings/utf_string_conversions.h"
@@ skipping 73 matching lines @@
 
 // The transparent button which holds a button state but is not rendered.
 class TransparentButton : public CustomButton {
  public:
   TransparentButton(ButtonListener* listener)
       : CustomButton(listener) {
     SetAnimationDuration(LabelButton::kHoverAnimationDurationMs);
   }
   virtual ~TransparentButton() {}
 
+  virtual bool OnMousePressed(const ui::MouseEvent& mouse_event) OVERRIDE {
+    parent()->RequestFocus();
+    return true;
+  }
+
   double GetAnimationValue() const {
     return hover_animation_->GetCurrentValue();
   }
 
  private:
   DISALLOW_COPY_AND_ASSIGN(TransparentButton);
 };
 
 // Returns the next or previous valid index (depending on |increment|'s value).
 // Skips separator or disabled indices. Returns -1 if there is no valid adjacent
@@ skipping 713 matching lines @@
     case STYLE_NORMAL:
       return kDisclosureArrowRightPadding;
     case STYLE_ACTION:
       return kDisclosureArrowButtonRightPadding;
   }
   NOTREACHED();
   return 0;
 }
 
 }  // namespace views