PNaCl on-demand installs: Make a separate async IPC to check if PNaCl is installed

chrome/renderer/pepper/pnacl_translation_resource_host.h

Index: chrome/renderer/pepper/pnacl_translation_resource_host.h
diff --git a/chrome/renderer/pepper/pnacl_translation_resource_host.h b/chrome/renderer/pepper/pnacl_translation_resource_host.h
index 41edcbf2d1d47cff4f7f0633e9738e31d1c419da..0ffe9231f22df4472b0a24b5c251b218bab1bed8 100644
--- a/chrome/renderer/pepper/pnacl_translation_resource_host.h
+++ b/chrome/renderer/pepper/pnacl_translation_resource_host.h
@@ -31,6 +31,10 @@ class PnaclTranslationResourceHost : public IPC::ChannelProxy::MessageFilter {
                      scoped_refptr<ppapi::TrackedCallback> callback);
   void ReportTranslationFinished(PP_Instance instance);
 
+  // Ensure that PNaCl resources (pnacl-llc.nexe, linker, libs) are installed.
+  void EnsurePnaclInstalled(PP_Instance instance,
+                            scoped_refptr<ppapi::TrackedCallback> callback);
+
  protected:
   virtual ~PnaclTranslationResourceHost();
 
@@ -51,6 +55,9 @@ class PnaclTranslationResourceHost : public IPC::ChannelProxy::MessageFilter {
   // Maps the instance with an outstanding cache request to the info
   // about that request.
   typedef std::map<PP_Instance, CacheRequestInfo> CacheRequestInfoMap;
+  // Maps the instance to an outstanding ensure pnacl installed request.
+  typedef std::map<PP_Instance, scoped_refptr<ppapi::TrackedCallback> >
+      EnsurePnaclInstalledMap;
   // IPC::ChannelProxy::MessageFilter implementation.
   virtual bool OnMessageReceived(const IPC::Message& message) OVERRIDE;
   virtual void OnFilterAdded(IPC::Channel* channel) OVERRIDE;
@@ -61,12 +68,19 @@ class PnaclTranslationResourceHost : public IPC::ChannelProxy::MessageFilter {
                            bool is_hit,
                            IPC::PlatformFileForTransit file);
   void CleanupCacheRequests();
+  void OnEnsurePnaclInstalledReply(PP_Instance instance,
+                                   bool success);
+  void OnEnsurePnaclInstalledProgress(PP_Instance instance,
+                                      int64_t current_progress,
+                                      int64_t total);
+  void CleanupEnsurePnaclRequests();
 
   scoped_refptr<base::MessageLoopProxy> io_message_loop_;
   IPC::Channel* channel_;
 
   // Should be accessed on the io thread.
   CacheRequestInfoMap pending_cache_requests_;
+  EnsurePnaclInstalledMap pending_ensure_pnacl_requests_;
 
   DISALLOW_COPY_AND_ASSIGN(PnaclTranslationResourceHost);
 };