Enable pinch-to-zoom on Windows 8 by default

content/browser/frame_host/render_widget_host_view_guest.cc

 // Copyright 2014 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 "base/bind_helpers.h"
 #include "base/command_line.h"
 #include "base/logging.h"
 #include "base/message_loop/message_loop.h"
 #include "content/browser/browser_plugin/browser_plugin_guest.h"
 #include "content/browser/frame_host/render_widget_host_view_guest.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/common/browser_plugin/browser_plugin_messages.h"
 #include "content/common/frame_messages.h"
 #include "content/common/gpu/gpu_messages.h"
 #include "content/common/view_messages.h"
 #include "content/common/webplugin_geometry.h"
 #include "content/public/common/content_switches.h"
 #include "skia/ext/platform_canvas.h"
 #include "third_party/WebKit/public/platform/WebScreenInfo.h"
 
 #if defined(OS_MACOSX)
 #import "content/browser/renderer_host/render_widget_host_view_mac_dictionary_helper.h"
 #endif
 
+#if defined(OS_WIN)
+#include "base/win/windows_version.h"
+#endif
+
 #if defined(OS_WIN) || defined(USE_AURA)
 #include "content/browser/renderer_host/ui_events_helper.h"
 #endif
 
 namespace content {
 
 namespace {
 
 #if defined(OS_WIN) || defined(USE_AURA)
 bool ShouldSendPinchGesture() {
+#if defined(OS_WIN)
+  if (base::win::GetVersion() >= base::win::VERSION_WIN8)
+    return true;
+#endif
   static bool pinch_allowed =
+      CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnableViewport) ||
       CommandLine::ForCurrentProcess()->HasSwitch(switches::kEnablePinch);
   return pinch_allowed;
 }
 
 blink::WebGestureEvent CreateFlingCancelEvent(double time_stamp) {
   blink::WebGestureEvent gesture_event;
   gesture_event.timeStampSeconds = time_stamp;
   gesture_event.type = blink::WebGestureEvent::GestureFlingCancel;
   gesture_event.sourceDevice = blink::WebGestureEvent::Touchscreen;
   return gesture_event;
@@ skipping 500 matching lines @@
     return;
   for (ui::GestureRecognizer::Gestures::iterator g_it = gestures->begin();
       g_it != gestures->end();
       ++g_it) {
     ForwardGestureEventToRenderer(*g_it);
   }
 }
 
 
 }  // namespace content