Add --disable-compositor-touch-hit-testing flag

cc/trees/layer_tree_host_impl.cc

 // Copyright 2011 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 "cc/trees/layer_tree_host_impl.h"
 
 #include <algorithm>
 #include <limits>
 
 #include "base/basictypes.h"
@@ skipping 408 matching lines @@
   client_->SetNeedsRedrawOnImplThread();
   client_->SetNeedsCommitOnImplThread();
   client_->RenewTreePriority();
 }
 
 void LayerTreeHostImpl::ScheduleAnimation() {
   client_->SetNeedsRedrawOnImplThread();
 }
 
 bool LayerTreeHostImpl::HaveTouchEventHandlersAt(gfx::Point viewport_point) {
+  if (!settings_.touch_hit_testing)
+    return true;
   if (!EnsureRenderSurfaceLayerList())
     return false;
 
   gfx::PointF device_viewport_point =
       gfx::ScalePoint(viewport_point, device_scale_factor_);
 
   // First find out which layer was hit from the saved list of visible layers
   // in the most recent frame.
   LayerImpl* layer_impl = LayerTreeHostCommon::FindLayerThatIsHitByPoint(
       device_viewport_point,
@@ skipping 2361 matching lines @@
   std::set<UIResourceId>::iterator found_in_evicted =
       evicted_ui_resources_.find(uid);
   if (found_in_evicted == evicted_ui_resources_.end())
     return;
   evicted_ui_resources_.erase(found_in_evicted);
   if (evicted_ui_resources_.empty())
     client_->OnCanDrawStateChanged(CanDraw());
 }
 
 }  // namespace cc