Disabled pinch zooming in non-browser Aura windows.

ui/views/controls/webview/webview.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 "ui/views/controls/webview/webview.h"
 
 #include "content/public/browser/browser_accessibility_state.h"
 #include "content/public/browser/browser_context.h"
 #include "content/public/browser/navigation_controller.h"
 #include "content/public/browser/render_view_host.h"
 #include "content/public/browser/render_widget_host_view.h"
 #include "content/public/browser/web_contents.h"
 #include "content/public/browser/web_contents_view.h"
 #include "ipc/ipc_message.h"
+#include "third_party/WebKit/public/web/WebInputEvent.h"
 #include "ui/base/accessibility/accessibility_types.h"
 #include "ui/base/accessibility/accessible_view_state.h"
 #include "ui/events/event.h"
 #include "ui/views/accessibility/native_view_accessibility.h"
 #include "ui/views/controls/native/native_view_host.h"
 #include "ui/views/focus/focus_manager.h"
 #include "ui/views/views_delegate.h"
 
 namespace views {
 
@@ skipping 159 matching lines @@
   DCHECK(wc_owner_.get());
   // The WebView is only the delegate of WebContentses it creates itself.
   OnWebContentsFocused(wc_owner_.get());
 }
 
 bool WebView::EmbedsFullscreenWidget() const {
   DCHECK(wc_owner_.get());
   return embed_fullscreen_widget_mode_enabled_;
 }
 
+bool WebView::PreHandleGestureEvent(
+    content::WebContents* source,
+    const blink::WebGestureEvent& event) {
+  // Disable pinch zooming.
+  return event.type == blink::WebGestureEvent::GesturePinchBegin ||
+      event.type == blink::WebGestureEvent::GesturePinchUpdate ||
+      event.type == blink::WebGestureEvent::GesturePinchEnd;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 // WebView, content::WebContentsObserver implementation:
 
 void WebView::RenderViewHostChanged(content::RenderViewHost* old_host,
                                     content::RenderViewHost* new_host) {
   FocusManager* const focus_manager = GetFocusManager();
   if (focus_manager && focus_manager->GetFocusedView() == this)
     OnFocus();
 }
 
@@ skipping 86 matching lines @@
   if (!contents) {
     content::WebContents::CreateParams create_params(
         browser_context, NULL);
     return content::WebContents::Create(create_params);
   }
 
   return contents;
 }
 
 }  // namespace views