Plumb firing passive event listeners.

content/renderer/input/input_event_filter.h

Index: content/renderer/input/input_event_filter.h
diff --git a/content/renderer/input/input_event_filter.h b/content/renderer/input/input_event_filter.h
index e2d18f398df33958bb04e6d79a8895db0dc4e92a..9a28b27168bd3c3a042666c78081e1c6355af121 100644
--- a/content/renderer/input/input_event_filter.h
+++ b/content/renderer/input/input_event_filter.h
@@ -7,12 +7,14 @@
 
 #include <queue>
 #include <set>
+#include <unordered_map>
 
 #include "base/callback.h"
 #include "base/synchronization/lock.h"
 #include "content/common/content_export.h"
 #include "content/common/input/input_event_ack_state.h"
 #include "content/renderer/input/input_handler_manager_client.h"
+#include "content/renderer/input/non_blocking_event_queue.h"
 #include "ipc/message_filter.h"
 #include "third_party/WebKit/public/web/WebInputEvent.h"
 
@@ -40,7 +42,8 @@ class Sender;
 namespace content {
 
 class CONTENT_EXPORT InputEventFilter : public InputHandlerManagerClient,
-                                        public IPC::MessageFilter {
+                                        public IPC::MessageFilter,
+                                        public NonBlockingEventQueueClient {
  public:
   InputEventFilter(
       const base::Callback<void(const IPC::Message&)>& main_listener,
@@ -66,6 +69,8 @@ class CONTENT_EXPORT InputEventFilter : public InputHandlerManagerClient,
   void DidOverscroll(int routing_id,
                      const DidOverscrollParams& params) override;
   void DidStopFlinging(int routing_id) override;
+  void NonBlockingInputEventHandled(int routing_id,
+                                    blink::WebInputEvent::Type type) override;
 
   // IPC::MessageFilter methods:
   void OnFilterAdded(IPC::Sender* sender) override;
@@ -73,6 +78,11 @@ class CONTENT_EXPORT InputEventFilter : public InputHandlerManagerClient,
   void OnChannelClosing() override;
   bool OnMessageReceived(const IPC::Message& message) override;
 
+  // NonBlockingEventQueueClient methods:
+  void SendNonBlockingEvent(int routing_id,
+                            const blink::WebInputEvent* event,
+                            const ui::LatencyInfo& latency) override;
+
  private:
   ~InputEventFilter() override;
 
@@ -97,6 +107,10 @@ class CONTENT_EXPORT InputEventFilter : public InputHandlerManagerClient,
   // Indicates the routing_ids for which input events should be filtered.
   std::set<int> routes_;
 
+  typedef std::unordered_map<int, scoped_ptr<NonBlockingEventQueue>>

[Charlie Reis, 2016/02/16 22:25:22]

I think we use "using" instead of typedefs now.
(https://chromium-cpp.appspot.com/)

[dtapuska, 2016/02/17 03:34:57]

Done.

+      RouteQueueMap;
+  RouteQueueMap route_queues_;
+
   // Used to intercept overscroll notifications while an event is being
   // dispatched.  If the event causes overscroll, the overscroll metadata can be
   // bundled in the event ack, saving an IPC.  Note that we must continue