Track plugin input event latency

ppapi/shared_impl/ppapi_globals.h

Index: ppapi/shared_impl/ppapi_globals.h
diff --git a/ppapi/shared_impl/ppapi_globals.h b/ppapi/shared_impl/ppapi_globals.h
index d9be03877e4aa6f6ceaab67469ffb7ee59a41656..a98d8979383c5c1ba65c34622e4b9ecb437293ff 100644
--- a/ppapi/shared_impl/ppapi_globals.h
+++ b/ppapi/shared_impl/ppapi_globals.h
@@ -5,7 +5,9 @@
 #ifndef PPAPI_SHARED_IMPL_PPAPI_GLOBALS_H_
 #define PPAPI_SHARED_IMPL_PPAPI_GLOBALS_H_
 
+#include <map>
 #include <string>
+#include <vector>
 
 #include "base/basictypes.h"
 #include "base/memory/ref_counted.h"
@@ -15,6 +17,7 @@
 #include "ppapi/c/ppb_console.h"
 #include "ppapi/shared_impl/api_id.h"
 #include "ppapi/shared_impl/ppapi_shared_export.h"
+#include "ui/events/latency_info.h"
 
 namespace base {
 class MessageLoopProxy;
@@ -134,6 +137,13 @@ class PPAPI_SHARED_EXPORT PpapiGlobals {
   // renderer process will have no effect.
   virtual void MarkPluginIsActive();
 
+  // Caches an input event's |latency_info| for the plugin |instance|.
+  void AddLatencyInfo(const ui::LatencyInfo& latency_info,
+                      PP_Instance instance);
+  // Transfers plugin |instance|'s latency info into |latency_info|.
+  void TransferLatencyInfoTo(std::vector<ui::LatencyInfo>* latency_info,
+                             PP_Instance instance);
+
  private:
   // Return the thread-local pointer which is used only for unit testing. It
   // should always be NULL when running in production. It allows separate
@@ -142,6 +152,11 @@ class PPAPI_SHARED_EXPORT PpapiGlobals {
 
   scoped_refptr<base::MessageLoopProxy> main_loop_proxy_;
 
+  // If an input event is believed to have caused rendering damage, its latency
+  // info is cached in |latency_info_for_frame_| indexed by instance. These
+  // latency info will be passed back to renderer with the next plugin frame.
+  std::map<PP_Instance, std::vector<ui::LatencyInfo> > latency_info_for_frame_;
+
   DISALLOW_COPY_AND_ASSIGN(PpapiGlobals);
 };