Track plugin input event latency

ppapi/proxy/plugin_globals.h

 // Copyright (c) 2012 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.
 
 #ifndef PPAPI_PROXY_PLUGIN_GLOBALS_H_
 #define PPAPI_PROXY_PLUGIN_GLOBALS_H_
 
+#include <map>
 #include <string>
+#include <vector>
 
 #include "base/compiler_specific.h"
 #include "base/memory/scoped_ptr.h"
 #include "base/threading/thread_local_storage.h"
 #include "ppapi/proxy/connection.h"
 #include "ppapi/proxy/plugin_resource_tracker.h"
 #include "ppapi/proxy/plugin_var_tracker.h"
 #include "ppapi/proxy/ppapi_proxy_export.h"
 #include "ppapi/shared_impl/callback_tracker.h"
 #include "ppapi/shared_impl/ppapi_globals.h"
+#include "ui/events/latency_info.h"
 
 namespace base {
 class Thread;
 }
 namespace IPC {
 class Sender;
 }
 
 struct PP_BrowserFont_Trusted_Description;
 
@@ skipping 98 matching lines @@
   // is known. This will be used for error logging.
   void set_plugin_name(const std::string& name) { plugin_name_ = name; }
 
   // The embedder should call this function when the command line is known.
   void set_command_line(const std::string& c) { command_line_ = c; }
 
   ResourceReplyThreadRegistrar* resource_reply_thread_registrar() {
     return resource_reply_thread_registrar_.get();
   }
 
+  // Cache a input event's |latency_info| for the plugin |instance|.
+  void AddLatencyInfo(ui::LatencyInfo latency_info, PP_Instance instance);

[piman, 2014/04/25 01:59:43]

How about stashing all this state/logic on the InstanceData instead?

[Yufeng Shen (Slow to review), 2014/04/25 20:42:42]

All the logic/data are now moved to the host side.

+  // Upon graphics invalidation, input events are considered to have caused
+  // rendering damage, their cached latency_info should continue to track
+  // the new plugin output frame until it reaches screen.
+  void OnGraphicsInvalidation(PP_Instance instance);
+  // On graphics flush, the cached latency_info are passed into |latency_info|
+  // if they are associated with rendering damage, or terminated if not.
+  void OnGraphicsFlush(std::vector<ui::LatencyInfo>* latency_info,
+                       PP_Instance instance);
+
   // Interval to limit how many IPC messages are sent indicating that the plugin
   // is active and should be kept alive. The value must be smaller than any
   // threshold used to kill inactive plugins by the embedder host.
   void set_keepalive_throttle_interval_milliseconds(unsigned i);
 
  private:
   class BrowserSender;
 
   // PpapiGlobals overrides.
   virtual bool IsPluginGlobals() const OVERRIDE;
@@ skipping 30 matching lines @@
   scoped_refptr<ResourceReplyThreadRegistrar> resource_reply_thread_registrar_;
 
   // Indicates activity by the plugin. Used to monitor when a plugin can be
   // shutdown due to idleness. Current needs do not require differentiating
   // between idle state between multiple instances, if any are active they are
   // all considered active.
   bool plugin_recently_active_;
 
   unsigned keepalive_throttle_interval_milliseconds_;
 
+  // Input event latency that are not associated with any output frame yet.
+  std::map<PP_Instance, std::vector<ui::LatencyInfo> > pending_latency_info_;
+  // Input event latency that are associated with next output frame.
+  std::map<PP_Instance, std::vector<ui::LatencyInfo> > latency_info_for_frame_;
+
   // Member variables should appear before the WeakPtrFactory, see weak_ptr.h.
   base::WeakPtrFactory<PluginGlobals> weak_factory_;
 
   DISALLOW_COPY_AND_ASSIGN(PluginGlobals);
 };
 
 }  // namespace proxy
 }  // namespace ppapi
 
 #endif   // PPAPI_PROXY_PLUGIN_GLOBALS_H_