Add apps_browsertests target (currently running 0 tests).

apps/shell/browser/shell_browser_main_parts.cc

Index: apps/shell/browser/shell_browser_main_parts.cc
diff --git a/apps/shell/browser/shell_browser_main_parts.cc b/apps/shell/browser/shell_browser_main_parts.cc
index e506e81a69e63091b3dbb0fdcd685b0a7610a1b2..bd95feedd9a76224bdc6a3deeb0d98648148465b 100644
--- a/apps/shell/browser/shell_browser_main_parts.cc
+++ b/apps/shell/browser/shell_browser_main_parts.cc
@@ -73,8 +73,7 @@ class ShellViewsDelegate : public views::TestViewsDelegate {
 
 ShellBrowserMainParts::ShellBrowserMainParts(
     const content::MainFunctionParams& parameters)
-    : extension_system_(NULL) {
-}
+    : extension_system_(NULL), parameters_(parameters) {}
 
 ShellBrowserMainParts::~ShellBrowserMainParts() {
 }
@@ -128,6 +127,15 @@ void ShellBrowserMainParts::PreMainMessageLoopRun() {
   devtools_delegate_.reset(
       new content::ShellDevToolsDelegate(browser_context_.get()));
 
+  // For running browser tests.
+  // TODO(yoz): This is set up to exit prematurely because we don't have
+  // any tests yet.
+  if (parameters_.ui_task) {
+    parameters_.ui_task->Run();
+    delete parameters_.ui_task;
+    return;
+  }
+
   CreateRootWindow();
   CreateViewsDelegate();