Add an API to component_updater that asks to do an update check "now".

chrome/browser/component_updater/pnacl/pnacl_component_installer.cc

Index: chrome/browser/component_updater/pnacl/pnacl_component_installer.cc
diff --git a/chrome/browser/component_updater/pnacl/pnacl_component_installer.cc b/chrome/browser/component_updater/pnacl/pnacl_component_installer.cc
index e33c21b43754956d9aa1bc4c2acbfad00a5ca236..f884374b1b86c22709b7208386a5c760f0b07d2a 100644
--- a/chrome/browser/component_updater/pnacl/pnacl_component_installer.cc
+++ b/chrome/browser/component_updater/pnacl/pnacl_component_installer.cc
@@ -26,6 +26,11 @@ using content::BrowserThread;
 
 namespace {
 
+// If PNaCl isn't installed yet, but a user is running chrome with
+// --enable-pnacl, this is the amount of time to wait before starting
+// a background install.
+const int kInitialDelaySeconds = 10;
+
 // CRX hash. This corresponds to AppId: emkhcgigkicgidendmffimilfehocheg
 const uint8 sha256_hash[] = {
   0x4c, 0xa7, 0x26, 0x86, 0xa8, 0x26, 0x83, 0x4d, 0x3c, 0x55,
@@ -69,10 +74,6 @@ const char* PnaclArch() {
 }
 
 // If we don't have Pnacl installed, this is the version we claim.
-// TODO(jvoung): Is there a way to trick the configurator to ping the server
-// earlier if there are components that are not yet installed (version 0.0.0.0),
-// So that they will be available ASAP? Be careful not to hurt startup speed.
-// Make kNullVersion part of ComponentUpdater in that case, to avoid skew?
 const char kNullVersion[] = "0.0.0.0";
 
 // Pnacl components have the version encoded in the path itself:
@@ -249,6 +250,13 @@ bool PnaclComponentInstaller::Install(base::DictionaryValue* manifest,
 
 namespace {
 
+void DoPingUpdater(ComponentUpdateService* cus,
+                   const CrxComponent& pnacl) {
+  if (cus->PingUpdateCheck(pnacl) != ComponentUpdateService::kOk) {
+    NOTREACHED() << "Pnacl ping update failed.";
+  }
+}
+
 // Finally, do the registration with the right version number.
 void FinishPnaclUpdateRegistration(ComponentUpdateService* cus,
                                    const Version& version) {
@@ -261,6 +269,16 @@ void FinishPnaclUpdateRegistration(ComponentUpdateService* cus,
   if (cus->RegisterComponent(pnacl) != ComponentUpdateService::kOk) {
     NOTREACHED() << "Pnacl component registration failed.";
   }
+
+  // If Pnacl is not yet installed, but it is requested by --enable-pnacl,
+  // we want it to be available "soon", so kick off an update check.
+  Version null_version(kNullVersion);
+  if (version.Equals(null_version)) {
+    BrowserThread::PostDelayedTask(
+        BrowserThread::UI, FROM_HERE,
+        base::Bind(DoPingUpdater, cus, pnacl),
+        base::TimeDelta::FromSeconds(kInitialDelaySeconds));
+  }
 }
 
 // Check if there is an existing version on disk first to know when