Add DCHECK to MaskedViewTargeter::GetHitTestMask() overrides

ui/app_list/views/speech_view.cc

 // 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.
 
 #include "ui/app_list/views/speech_view.h"
 
 #include "base/strings/utf_string_conversions.h"
 #include "grit/ui_resources.h"
 #include "grit/ui_strings.h"
 #include "third_party/skia/include/core/SkPath.h"
@@ skipping 100 matching lines @@
 class MicButtonTargeter : public views::MaskedViewTargeter {
  public:
   explicit MicButtonTargeter(views::View* mic_button)
       : views::MaskedViewTargeter(mic_button) {}
   virtual ~MicButtonTargeter() {}
 
  private:
   // views::MaskedViewTargeter:
   virtual bool GetHitTestMask(const views::View* view,
                               gfx::Path* mask) const OVERRIDE {
+    DCHECK(mask);
+    DCHECK(view == masked_view());
+
     // The mic button icon is a circle.
     gfx::Rect local_bounds = view->GetLocalBounds();
     int radius = local_bounds.width() / 2 + kIndicatorRadiusMinOffset;
     gfx::Point center = local_bounds.CenterPoint();
     center.set_y(center.y() + kIndicatorCenterOffsetY);
     mask->addCircle(SkIntToScalar(center.x()),
                     SkIntToScalar(center.y()),
                     SkIntToScalar(radius));
     return true;
   }
@@ skipping 137 matching lines @@
     resource_id = IDR_APP_LIST_SPEECH_MIC_ON;
   else if (new_state == SPEECH_RECOGNITION_IN_SPEECH)
     resource_id = IDR_APP_LIST_SPEECH_MIC_RECORDING;
 
   ui::ResourceBundle& bundle = ui::ResourceBundle::GetSharedInstance();
   mic_button_->SetImage(views::Button::STATE_NORMAL,
                         bundle.GetImageSkiaNamed(resource_id));
 }
 
 }  // namespace app_list