Installing a platform application will add all application shortucts.

chrome/browser/extensions/extension_service.cc

Index: chrome/browser/extensions/extension_service.cc
diff --git a/chrome/browser/extensions/extension_service.cc b/chrome/browser/extensions/extension_service.cc
index 5da59ed9267b9ec3aa90b0db457ea0ae3e26d50e..2010d7cd598a0caffec117d501b0dbfe74868e1b 100644
--- a/chrome/browser/extensions/extension_service.cc
+++ b/chrome/browser/extensions/extension_service.cc
@@ -72,8 +72,10 @@
 #include "chrome/browser/ui/global_error_service.h"
 #include "chrome/browser/ui/global_error_service_factory.h"
 #include "chrome/browser/ui/webui/chrome_url_data_manager.h"
+#include "chrome/browser/ui/webui/extension_icon_source.h"
 #include "chrome/browser/ui/webui/favicon_source.h"
 #include "chrome/browser/ui/webui/ntp/thumbnail_source.h"
+#include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/child_process_logging.h"
 #include "chrome/common/chrome_notification_types.h"
 #include "chrome/common/chrome_paths.h"
@@ -97,6 +99,7 @@
 #include "content/public/browser/render_process_host.h"
 #include "content/public/common/pepper_plugin_info.h"
 #include "googleurl/src/gurl.h"
+#include "grit/theme_resources.h"
 #include "net/base/registry_controlled_domain.h"
 #include "webkit/database/database_tracker.h"
 #include "webkit/database/database_util.h"
@@ -386,7 +389,8 @@ ExtensionService::ExtensionService(Profile* profile,
       permissions_manager_(ALLOW_THIS_IN_INITIALIZER_LIST(this)),
       apps_promo_(profile->GetPrefs()),
       event_routers_initialized_(false),
-      extension_warnings_(profile) {
+      extension_warnings_(profile),
+      tracker_(this) {

[miket_OOO, 2011/12/09 18:42:02]

Please see
http://codesearch.google.com/#OAMlx_jo-ck/src/base/compiler_specific.h&exact_...

[benwells, 2011/12/12 03:03:00]

Done.

   CHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
 
   // Figure out if extension installation should be enabled.
@@ -2095,6 +2099,13 @@ void ExtensionService::OnExtensionInstalled(
       content::Source<Profile>(profile_),
       content::Details<const Extension>(extension));
 
+  // Temporary feature to always install shortcuts for platform apps to
+  // facilitate early testing.
+  // TODO(benwells): Remove before launching platform apps.
+  if (extension->is_platform_app()) {
+      StartInstallApplicationShortcut(extension);
+  }
+
   // Transfer ownership of |extension| to AddExtension.
   AddExtension(scoped_extension);
 }
@@ -2507,3 +2518,53 @@ ExtensionService::NaClModuleInfoList::iterator
   }
   return nacl_module_list_.end();
 }
+
+void ExtensionService::StartInstallApplicationShortcut(
+    const Extension* extension) {
+#if !defined(OS_MACOSX)
+  const int kAppIconSize = 32;
+
+  shortcut_info_.extension_id = extension->id();
+  shortcut_info_.url = GURL(extension->launch_web_url());
+  shortcut_info_.title = UTF8ToUTF16(extension->name());
+  shortcut_info_.description = UTF8ToUTF16(extension->description());
+  shortcut_info_.create_in_applications_menu = true;
+  shortcut_info_.create_in_quick_launch_bar = true;
+  shortcut_info_.create_on_desktop = true;
+
+  // The icon will be resized to |max_size|.
+  const gfx::Size max_size(kAppIconSize, kAppIconSize);
+
+  // Look for an icon.  If there is no icon at the ideal size,

[miket_OOO, 2011/12/09 18:42:02]

Prevailing style calls for single space after period. Also see
http://www.slate.com/articles/technology/technology/2011/01/space_invaders.html

[benwells, 2011/12/12 03:03:00]

Point taken! As a committed single spacer, I will be more careful in future when
copying comments from old code :)

+  // we will resize whatever we can get.  Making a large icon smaller
+  // is prefered to making a small icon larger, so look for a larger
+  // icon first:
+  ExtensionResource icon_resource = extension->GetIconResource(
+      kAppIconSize,
+      ExtensionIconSet::MATCH_BIGGER);
+
+  // If no icon exists that is the desired size or larger, get the
+  // largest icon available:
+  if (icon_resource.empty()) {
+    icon_resource = extension->GetIconResource(
+        kAppIconSize,
+        ExtensionIconSet::MATCH_SMALLER);
+  }

[miket_OOO, 2011/12/09 18:42:02]

Is another .empty() case possible at this point? (I don't know.)

[benwells, 2011/12/12 03:03:00]

Yes, but the LoadImage call and OnImageLoaded callback handle this situation.
I've added comments to make this obvious.

+
+  tracker_.LoadImage(extension,
+                     icon_resource,
+                     max_size,
+                     ImageLoadingTracker::DONT_CACHE);
+#endif
+}
+
+void ExtensionService::OnImageLoaded(SkBitmap *image,
+                                     const ExtensionResource &resource,
+                                     int index)
+{
+  if (!image || image->isNull())
+    image = ExtensionIconSource::LoadImageByResourceId(IDR_APP_DEFAULT_ICON);
+
+  shortcut_info_.favicon = *image;
+  web_app::CreateShortcut(profile_->GetPath(), shortcut_info_, NULL);
+}