Disabled pinch zooming in non-browser Aura windows.

apps/shell_window.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 "apps/shell_window.h"
 
 #include "apps/shell_window_geometry_cache.h"
 #include "apps/shell_window_registry.h"
 #include "apps/ui/native_app_window.h"
 #include "base/command_line.h"
@@ skipping 329 matching lines @@
                                      bool user_gesture,
                                      bool last_unlocked_by_target) {
   bool has_permission = IsExtensionWithPermissionOrSuggestInConsole(
       APIPermission::kPointerLock,
       extension_,
       web_contents->GetRenderViewHost());
 
   web_contents->GotResponseToLockMouseRequest(has_permission);
 }
 
+bool ShellWindow::PreHandleGestureEvent(
+    WebContents* source,
+    const blink::WebGestureEvent& event) {
+  // Disable pinch zooming in shell windows.
+  return event.type == blink::WebGestureEvent::GesturePinchBegin ||
+      event.type == blink::WebGestureEvent::GesturePinchUpdate ||
+      event.type == blink::WebGestureEvent::GesturePinchEnd;
+}
+
 void ShellWindow::DidFirstVisuallyNonEmptyPaint(int32 page_id) {
   first_paint_complete_ = true;
   if (show_on_first_paint_) {
     DCHECK(delayed_show_type_ == SHOW_ACTIVE ||
            delayed_show_type_ == SHOW_INACTIVE);
     Show(delayed_show_type_);
   }
 }
 
 void ShellWindow::OnNativeClose() {
@@ skipping 525 matching lines @@
         region.bounds.x(),
         region.bounds.y(),
         region.bounds.right(),
         region.bounds.bottom(),
         region.draggable ? SkRegion::kUnion_Op : SkRegion::kDifference_Op);
   }
   return sk_region;
 }
 
 }  // namespace apps