Support InputRouter recycling

content/browser/renderer_host/input/input_router_config_helper.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 "content/browser/renderer_host/input/input_router_config_helper.h"
 
 #include "base/command_line.h"
+#include "base/logging.h"
 #include "content/public/common/content_switches.h"
 #include "ui/events/gesture_detection/gesture_detector.h"
 
 #if defined(USE_AURA)
 #include "ui/events/gestures/gesture_configuration.h"
 #elif defined(OS_ANDROID)
 #include "ui/gfx/android/view_configuration.h"
 #include "ui/gfx/screen.h"
 #endif
 
@@ skipping 98 matching lines @@
     return TouchEventQueue::TOUCH_SCROLLING_MODE_ASYNC_TOUCHMOVE;
   if (modeString == switches::kTouchScrollingModeSyncTouchmove)
     return TouchEventQueue::TOUCH_SCROLLING_MODE_SYNC_TOUCHMOVE;
   if (modeString == switches::kTouchScrollingModeTouchcancel)
     return TouchEventQueue::TOUCH_SCROLLING_MODE_TOUCHCANCEL;
   if (modeString != "")
     LOG(ERROR) << "Invalid --touch-scrolling-mode option: " << modeString;
   return TouchEventQueue::TOUCH_SCROLLING_MODE_DEFAULT;
 }
 
+bool GetValidateEventStream() {
+#if defined(DCHECK_IS_ON)
+  return base::CommandLine::ForCurrentProcess()->HasSwitch(
+      switches::kValidateInputEventStream);
+#endif
+  return false;
+}
+
 }  // namespace
 
 InputRouterImpl::Config GetInputRouterConfigForPlatform() {
   InputRouterImpl::Config config;
   config.gesture_config = GetGestureEventQueueConfig();
   config.touch_config = GetTouchEventQueueConfig();
   config.touch_config.touch_scrolling_mode = GetTouchScrollingMode();
+  config.validate_event_stream = GetValidateEventStream();
   return config;
 }
 
 }  // namespace content