Do not cycle through tabs if the user uses the scroll wheel while hovering over the window border

chrome/browser/ui/views/frame/browser_root_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/frame/browser_root_view.h"
 
 #include "chrome/browser/autocomplete/autocomplete_classifier.h"
 #include "chrome/browser/autocomplete/autocomplete_classifier_factory.h"
 #include "chrome/browser/autocomplete/autocomplete_input.h"
 #include "chrome/browser/autocomplete/autocomplete_match.h"
 #include "chrome/browser/defaults.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/ui/browser_commands.h"
 #include "chrome/browser/ui/tabs/tab_strip_model.h"
 #include "chrome/browser/ui/views/frame/browser_frame.h"
 #include "chrome/browser/ui/views/frame/browser_view.h"
 #include "chrome/browser/ui/views/tabs/tab_strip.h"
 #include "chrome/browser/ui/views/touch_uma/touch_uma.h"
 #include "ui/base/dragdrop/drag_drop_types.h"
 #include "ui/base/dragdrop/os_exchange_data.h"
+#include "ui/base/hit_test.h"
 
 // static
 const char BrowserRootView::kViewClassName[] =
     "browser/ui/views/frame/BrowserRootView";
 
 BrowserRootView::BrowserRootView(BrowserView* browser_view,
                                  views::Widget* widget)
     : views::internal::RootView(widget),
       browser_view_(browser_view),
       forwarding_to_tab_strip_(false) { }
@@ skipping 86 matching lines @@
 
 const char* BrowserRootView::GetClassName() const {
   return kViewClassName;
 }
 
 bool BrowserRootView::OnMouseWheel(const ui::MouseWheelEvent& event) {
   if (browser_defaults::kScrollEventChangesTab) {
     // Switch to the left/right tab if the wheel-scroll happens over the
     // tabstrip, or the empty space beside the tabstrip.
     views::View* hit_view = GetEventHandlerForPoint(event.location());
-    views::NonClientView* non_client = GetWidget()->non_client_view();
+    int hittest =
+        GetWidget()->non_client_view()->NonClientHitTest(event.location());
     if (tabstrip()->Contains(hit_view) ||
-        hit_view == non_client->frame_view()) {
+        hittest == HTCAPTION ||
+        hittest == HTTOP) {
       int scroll_offset = abs(event.y_offset()) > abs(event.x_offset()) ?
           event.y_offset() : -event.x_offset();
       Browser* browser = browser_view_->browser();
       TabStripModel* model = browser->tab_strip_model();
       // Switch to the next tab only if not at the end of the tab-strip.
       if (scroll_offset < 0 && model->active_index() + 1 < model->count()) {
         chrome::SelectNextTab(browser);
         return true;
       }
 
@@ skipping 57 matching lines @@
   AutocompleteClassifierFactory::GetForProfile(
       browser_view_->browser()->profile())->Classify(
           text, false, false, AutocompleteInput::INVALID_SPEC, &match, NULL);
   if (!match.destination_url.is_valid())
     return false;
 
   if (url)
     *url = match.destination_url;
   return true;
 }