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

content/browser/web_contents/web_contents_impl.cc

Index: content/browser/web_contents/web_contents_impl.cc
diff --git a/content/browser/web_contents/web_contents_impl.cc b/content/browser/web_contents/web_contents_impl.cc
index fe8fb358060b07f154868a01334a0a1eb8f62eb7..f90ef48fb22573d44428c2a19f705426697e47d1 100644
--- a/content/browser/web_contents/web_contents_impl.cc
+++ b/content/browser/web_contents/web_contents_impl.cc
@@ -54,6 +54,7 @@
 #include "content/browser/renderer_host/render_view_host_delegate_view.h"
 #include "content/browser/renderer_host/render_view_host_impl.h"
 #include "content/browser/renderer_host/render_widget_host_impl.h"
+#include "content/browser/renderer_host/render_widget_host_input_event_router.h"
 #include "content/browser/renderer_host/render_widget_host_view_base.h"
 #include "content/browser/screen_orientation/screen_orientation_dispatcher_host_impl.h"
 #include "content/browser/site_instance_impl.h"
@@ -416,6 +417,8 @@ WebContentsImpl::WebContentsImpl(BrowserContext* browser_context)
 WebContentsImpl::~WebContentsImpl() {
   is_being_destroyed_ = true;
 
+  rwh_input_event_router_.reset();
+
   // Delete all RFH pending shutdown, which will lead the corresponding RVH to
   // shutdown and be deleted as well.
   frame_tree_.ForEach(
@@ -1569,6 +1572,14 @@ bool WebContentsImpl::PreHandleGestureEvent(
   return delegate_ && delegate_->PreHandleGestureEvent(this, event);
 }
 
+RenderWidgetHostInputEventRouter* WebContentsImpl::GetInputEventRouter() {
+  // Currently only supported in site per process mode (--site-per-process).
+  if (!rwh_input_event_router_.get() && !is_being_destroyed_ &&
+      SiteIsolationPolicy::AreCrossProcessFramesPossible())
+    rwh_input_event_router_.reset(new RenderWidgetHostInputEventRouter);
+  return rwh_input_event_router_.get();
+}
+
 void WebContentsImpl::EnterFullscreenMode(const GURL& origin) {
   // This method is being called to enter renderer-initiated fullscreen mode.
   // Make sure any existing fullscreen widget is shut down first.