Add WebstoreInlineInstaller (downloads store data, shows the install UI, and starts the install).

chrome/browser/extensions/extension_tab_helper.cc

Index: chrome/browser/extensions/extension_tab_helper.cc
diff --git a/chrome/browser/extensions/extension_tab_helper.cc b/chrome/browser/extensions/extension_tab_helper.cc
index 024b4ebd14f4b3dba20ef11040bec3a7888c537f..cd8c9e33fbf75f569e7893c933a8fca4f865d142 100644
--- a/chrome/browser/extensions/extension_tab_helper.cc
+++ b/chrome/browser/extensions/extension_tab_helper.cc
@@ -6,6 +6,7 @@
 
 #include "base/command_line.h"
 #include "chrome/browser/extensions/extension_service.h"
+#include "chrome/browser/extensions/webstore_inline_installer.h"
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/sessions/restore_tab_helper.h"
 #include "chrome/browser/ui/browser.h"
@@ -154,15 +155,9 @@ void ExtensionTabHelper::OnInlineWebstoreInstall(
     return;
   }
 
-  // For now there is no inline installation UI, we just open the item's Web
-  // Store page in a new tab.
-  GURL webstore_item_url =
-      GURL(extension_urls::GetWebstoreItemDetailURLPrefix() + webstore_item_id);
-  GetBrowser()->OpenURL(OpenURLParams(
-      webstore_item_url,
-      GetBrowser()->GetSelectedTabContents()->GetURL(),
-      NEW_FOREGROUND_TAB,
-      PageTransition::AUTO_BOOKMARK));
+  scoped_refptr<WebstoreInlineInstaller> installer(new WebstoreInlineInstaller(
+      tab_contents(), webstore_item_id, this));
+  installer->BeginInstall();
 }
 
 void ExtensionTabHelper::OnRequest(
@@ -213,6 +208,15 @@ Browser* ExtensionTabHelper::GetBrowser() {
   return NULL;
 }
 
+void ExtensionTabHelper::OnInlineInstallSuccess() {
+  Send(new ExtensionMsg_InlineWebstoreInstallResponse(routing_id(), true, ""));
+}
+
+void ExtensionTabHelper::OnInlineInstallFailure(const std::string& error) {
+  Send(new ExtensionMsg_InlineWebstoreInstallResponse(
+      routing_id(), false, error));
+}
+
 TabContents* ExtensionTabHelper::GetAssociatedTabContents() const {
   return tab_contents();
 }