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

chrome/browser/nacl_host/nacl_host_message_filter.h

Index: chrome/browser/nacl_host/nacl_host_message_filter.h
diff --git a/chrome/browser/nacl_host/nacl_host_message_filter.h b/chrome/browser/nacl_host/nacl_host_message_filter.h
index 66af82de625f7c31a19c1afd281a843eb3ef4048..a59b6e5c0da453dc60307f4e3126ccf3855eda26 100644
--- a/chrome/browser/nacl_host/nacl_host_message_filter.h
+++ b/chrome/browser/nacl_host/nacl_host_message_filter.h
@@ -5,6 +5,7 @@
 #ifndef CHROME_BROWSER_NACL_HOST_NACL_HOST_MESSAGE_FILTER_H_
 #define CHROME_BROWSER_NACL_HOST_NACL_HOST_MESSAGE_FILTER_H_
 
+#include "base/basictypes.h"
 #include "base/files/file_path.h"
 #include "base/memory/weak_ptr.h"
 #include "content/public/browser/browser_message_filter.h"
@@ -51,6 +52,11 @@ class NaClHostMessageFilter : public content::BrowserMessageFilter {
 #if !defined(DISABLE_NACL)
   void OnLaunchNaCl(const nacl::NaClLaunchParams& launch_params,
                     IPC::Message* reply_msg);
+  void OnEnsurePnaclInstalled(int instance);
+  void ReplyEnsurePnaclInstalled(int instance, bool success);
+  void SendProgressEnsurePnaclInstalled(int instance,
+                                        int64 current_progress,
+                                        int64 total);

[dmichael (off chromium), 2013/08/01 17:33:49]

nit: I'm used to seeing message handler methods defined together and other stuff
(like ReplyEnsurePnacl... and SendProgress...) defined separately from the
message handlers. E.g., maybe these two should go down with
SyncReturnTemporaryFile and AsyncReturnTemporaryFile.

[jvoung (off chromium), 2013/08/01 23:14:07]

Done.

   void OnGetReadonlyPnaclFd(const std::string& filename,
                             IPC::Message* reply_msg);
   void OnNaClCreateTemporaryFile(IPC::Message* reply_msg);