Make ChromeOS shelf use Browser app name to group hosted app windows.

chrome/browser/ui/ash/launcher/launcher_app_tab_helper.cc

Index: chrome/browser/ui/ash/launcher/launcher_app_tab_helper.cc
diff --git a/chrome/browser/ui/ash/launcher/launcher_app_tab_helper.cc b/chrome/browser/ui/ash/launcher/launcher_app_tab_helper.cc
index 622e6bb400b2f8e00f4001d15931e61634ab3a38..862bccc8bba4ac7d57f3a0501e9024187f59151d 100644
--- a/chrome/browser/ui/ash/launcher/launcher_app_tab_helper.cc
+++ b/chrome/browser/ui/ash/launcher/launcher_app_tab_helper.cc
@@ -12,6 +12,7 @@
 #include "chrome/browser/profiles/profile.h"
 #include "chrome/browser/profiles/profile_manager.h"
 #include "chrome/browser/ui/browser_finder.h"
+#include "chrome/browser/web_applications/web_app.h"
 #include "chrome/common/chrome_switches.h"
 #include "chrome/common/extensions/manifest_handlers/app_launch_info.h"
 #include "content/public/browser/navigation_entry.h"
@@ -30,30 +31,32 @@ const extensions::Extension* GetExtensionForTab(Profile* profile,
   Browser* browser = chrome::FindBrowserWithWebContents(tab);
   DCHECK(browser);
 
-  GURL url = tab->GetURL();
+  // Use the Browser's app name to determine the extension for app windows and
+  // use the tab's url for app tabs.
   if (browser->is_app()) {
-    // Only consider the original URL of an app window when determining its
-    // associated extension.
-    if (tab->GetController().GetEntryCount())
-      url = tab->GetController().GetEntryAtIndex(0)->GetURL();
-
-    // Bookmark app windows should match their launch url extension despite
-    // their web extents.
-    if (CommandLine::ForCurrentProcess()->HasSwitch(
-            switches::kEnableStreamlinedHostedApps)) {
-      const extensions::ExtensionSet& extensions =
-          extensions::ExtensionRegistry::Get(profile)->enabled_extensions();
-      for (extensions::ExtensionSet::const_iterator it = extensions.begin();
-           it != extensions.end(); ++it) {
-        if (it->get()->from_bookmark() &&
-            extensions::AppLaunchInfo::GetLaunchWebURL(it->get()) == url) {
-          return it->get();
-        }
+    return extension_service->GetInstalledExtension(
+        web_app::GetExtensionIdFromApplicationName(browser->app_name()));
+  }
+
+  const GURL url = tab->GetURL();
+  if (extension_service->IsInstalledApp(url))
+    return extension_service->GetInstalledApp(url);
+
+  // Bookmark app windows should match their launch url extension despite
+  // their web extents.
+  if (CommandLine::ForCurrentProcess()->HasSwitch(
+          switches::kEnableStreamlinedHostedApps)) {
+    const extensions::ExtensionSet& extensions =
+        extensions::ExtensionRegistry::Get(profile)->enabled_extensions();
+    for (extensions::ExtensionSet::const_iterator it = extensions.begin();
+         it != extensions.end(); ++it) {
+      if (it->get()->from_bookmark() &&
+          extensions::AppLaunchInfo::GetLaunchWebURL(it->get()) == url) {
+        return it->get();
       }
     }
   }
-
-  return extension_service->GetInstalledApp(url);
+  return NULL;
 }
 
 const extensions::Extension* GetExtensionByID(Profile* profile,