Add Vector2d classes that represent offsets, instead of using Point.

chrome/browser/ui/views/panels/panel_view.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 "chrome/browser/ui/views/panels/panel_view.h"
 
 #include <map>
 #include "base/logging.h"
 #include "base/utf_string_conversions.h"
 #include "chrome/app/chrome_command_ids.h"
@@ skipping 749 matching lines @@
   mouse_pressed_ = true;
   mouse_dragging_state_ = NO_DRAGGING;
   last_mouse_location_ = mouse_location;
   return true;
 }
 
 bool PanelView::OnTitlebarMouseDragged(const gfx::Point& mouse_location) {
   if (!mouse_pressed_)
     return false;
 
-  int delta_x = mouse_location.x() - last_mouse_location_.x();
-  int delta_y = mouse_location.y() - last_mouse_location_.y();
   if (mouse_dragging_state_ == NO_DRAGGING &&
-      ExceededDragThreshold(delta_x, delta_y)) {
+      ExceededDragThreshold(mouse_location - last_mouse_location_)) {
     // When a drag begins, we do not want to the client area to still receive
     // the focus. We do not need to do this for the unfocused minimized panel.
     if (!panel_->IsMinimized()) {
       old_focused_view_ = GetFocusManager()->GetFocusedView();
       GetFocusManager()->SetFocusedView(GetFrameView());
     }
 
     panel_->manager()->StartDragging(panel_.get(), last_mouse_location_);
     mouse_dragging_state_ = DRAGGING_STARTED;
   }
@@ skipping 107 matching lines @@
   int height = web_view_->size().height();
   SkRegion* region = new SkRegion;
   region->op(0, 0, kResizeInsideBoundsSize, height, SkRegion::kUnion_Op);
   region->op(width - kResizeInsideBoundsSize, 0, width, height,
       SkRegion::kUnion_Op);
   region->op(0, height - kResizeInsideBoundsSize, width, height,
       SkRegion::kUnion_Op);
   web_contents->GetRenderViewHost()->GetView()->SetClickthroughRegion(region);
 #endif
 }