Implement basic crash detection and shutdown handling for out of process PPAP...

webkit/plugins/ppapi/resource_tracker.h

Index: webkit/plugins/ppapi/resource_tracker.h
===================================================================
--- webkit/plugins/ppapi/resource_tracker.h	(revision 74733)
+++ webkit/plugins/ppapi/resource_tracker.h	(working copy)
@@ -87,8 +87,11 @@
   // The given handle should be one generated by AddInstance.
   void InstanceDeleted(PP_Instance instance);
 
+  void InstanceCrashed(PP_Instance instance);
+
   // Returns a pointer to the plugin instance object associated with the given
-  // instance handle. The return value will be NULL if the handle is invalid.
+  // instance handle. The return value will be NULL if the handle is invalid or
+  // if the instance has crashed.
   PluginInstance* GetInstance(PP_Instance instance);
 
  private:
@@ -117,6 +120,11 @@
   // The same as AddResource but for Var, and returns the new Var ID.
   int32 AddVar(Var* var);
 
+  // Force frees all vars and resources associated with the given instance.
+  // If delete_instance is true, the instance tracking information will also
+  // be deleted.
+  void CleanupInstanceData(PP_Instance instance, bool delete_instance);
+
   // Overrides the singleton object. This is used for tests which want to
   // specify their own tracker (otherwise, you can get cross-talk between
   // tests since the data will live into the subsequent tests).