Add non-member non-mutating methods for common gfx::Rect operations.

ash/system/drive/tray_drive.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 "ash/system/drive/tray_drive.h"
 
 #include <vector>
 
 #include "ash/shell.h"
 #include "ash/system/tray/system_tray.h"
@@ skipping 202 matching lines @@
 
       int pos_x = child_area.x() + kSidePadding;
       int pos_y = child_area.y() + kTopPadding;
 
       gfx::Rect bounds_status(
           gfx::Point(pos_x,
                      pos_y + (child_area.height() - kTopPadding -
                          kBottomPadding -
                          status_img_->GetPreferredSize().height())/2),
           status_img_->GetPreferredSize());
-      bounds_status.Intersect(child_area);
-      status_img_->SetBoundsRect(bounds_status);
+      status_img_->SetBoundsRect(
+          gfx::IntersectRects(bounds_status, child_area));
       pos_x += status_img_->bounds().width() + kHorizontalPadding;
 
       gfx::Rect bounds_label(pos_x,
                              pos_y,
                              child_area.width() - 2 * kSidePadding -
                                  2 * kHorizontalPadding -
                                  status_img_->GetPreferredSize().width() -
                                  cancel_button_->GetPreferredSize().width(),
                              label_container_->GetPreferredSize().height());
-      bounds_label.Intersect(child_area);
-      label_container_->SetBoundsRect(bounds_label);
+      label_container_->SetBoundsRect(
+          gfx::IntersectRects(bounds_label, child_area));
       pos_x += label_container_->bounds().width() + kHorizontalPadding;
 
       gfx::Rect bounds_button(
           gfx::Point(pos_x,
                      pos_y + (child_area.height() - kTopPadding -
                          kBottomPadding -
                          cancel_button_->GetPreferredSize().height())/2),
           cancel_button_->GetPreferredSize());
-      bounds_button.Intersect(child_area);
-      cancel_button_->SetBoundsRect(bounds_button);
+      cancel_button_->SetBoundsRect(
+          gfx::IntersectRects(bounds_button, child_area));
     }
 
     // views::ButtonListener overrides.
     virtual void ButtonPressed(views::Button* sender,
                                const ui::Event& event) OVERRIDE {
       DCHECK(sender == cancel_button_);
       container_->OnCancelOperation(file_path_);
     }
 
     DriveDetailedView* container_;
@@ skipping 183 matching lines @@
 
   if (default_)
     default_->Update(&list);
 
   if (detailed_)
     detailed_->Update(&list);
 }
 
 }  // namespace internal
 }  // namespace ash