Mac: Cmd-three finger swipe should open prev/next page in new tab.

chrome/browser/cocoa/browser_window_controller.mm

 // Copyright (c) 2009 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 <Carbon/Carbon.h>
 
 #include "app/l10n_util_mac.h"
 #include "base/mac_util.h"
 #include "base/scoped_nsdisable_screen_updates.h"
 #import "base/scoped_nsobject.h"
@@ skipping 1429 matching lines @@
 // likely add a public API, but the worst that will happen is that this will
 // turn into dead code and just won't get called.
 - (void)swipeWithEvent:(NSEvent*)event {
   // Map forwards and backwards to history; left is positive, right is negative.
   unsigned int command = 0;
   if ([event deltaX] > 0.5)
     command = IDC_BACK;
   else if ([event deltaX] < -0.5)
     command = IDC_FORWARD;
   else if ([event deltaY] > 0.5)
-    ;  // TODO(pinkerton): figure out page-up
+    ;  // TODO(pinkerton): figure out page-up, http://crbug.com/16305
   else if ([event deltaY] < -0.5)
-    ;  // TODO(pinkerton): figure out page-down
+    ;  // TODO(pinkerton): figure out page-down, http://crbug.com/16305
 
   // Ensure the command is valid first (ExecuteCommand() won't do that) and
   // then make it so.
   if (browser_->command_updater()->IsCommandEnabled(command))
-    browser_->ExecuteCommand(command);
+    browser_->ExecuteCommandWithDisposition(command,
+        event_utils::WindowOpenDispositionFromNSEvent(event));
 }
 
 // Delegate method called when window is resized.
 - (void)windowDidResize:(NSNotification*)notification {
   // Resize (and possibly move) the status bubble. Note that we may get called
   // when the status bubble does not exist.
   if (statusBubble_) {
     statusBubble_->UpdateSizeAndPosition();
   }
 }
@@ skipping 488 matching lines @@
   if (frameOverlayInactiveImage) {
     [theme setValue:frameOverlayInactiveImage
        forAttribute:@"overlay"
               style:GTMThemeStyleWindow
               state:GTMThemeStateInactiveWindow];
   }
 
   return theme;
 }
 @end