Implement surface-based browser process hit testing for Mac and Aura

content/browser/compositor/delegated_frame_host.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/compositor/delegated_frame_host.h"
 
 #include "base/callback_helpers.h"
 #include "base/command_line.h"
 #include "base/time/default_tick_clock.h"
 #include "cc/output/compositor_frame.h"
@@ skipping 190 matching lines @@
 uint32_t DelegatedFrameHost::GetSurfaceIdNamespace() {
   if (!use_surfaces_)
     return 0;
 
   return id_allocator_->id_namespace();
 }
 
 cc::SurfaceId DelegatedFrameHost::SurfaceIdAtPoint(
     const gfx::Point& point,
     gfx::Point* transformed_point) {
+  if (surface_id_.is_null())
+    return surface_id_;
   cc::SurfaceHittest hittest(GetSurfaceManager());
   return hittest.Hittest(surface_id_, point, transformed_point);
 }
 
 bool DelegatedFrameHost::ShouldSkipFrame(gfx::Size size_in_dip) const {
   // Should skip a frame only when another frame from the renderer is guaranteed
   // to replace it. Otherwise may cause hangs when the renderer is waiting for
   // the completion of latency infos (such as when taking a Snapshot.)
   if (can_lock_compositor_ == NO_PENDING_RENDERER_FRAME ||
       can_lock_compositor_ == NO_PENDING_COMMIT ||
@@ skipping 808 matching lines @@
     cc::SurfaceManager* manager = factory->GetSurfaceManager();
     new_layer->SetShowSurface(
         surface_id_, base::Bind(&SatisfyCallback, base::Unretained(manager)),
         base::Bind(&RequireCallback, base::Unretained(manager)),
         current_surface_size_, current_scale_factor_,
         current_frame_size_in_dip_);
   }
 }
 
 }  // namespace content