Fix several crashes for ARC app launcher.

chrome/browser/ui/app_list/arc/arc_app_unittest.cc

 // Copyright 2015 The Chromium Authors. All rights reserved.
 // Use of this source code is governed by a BSD-style license that can be
 // found in the LICENSE file.
 
 #include <algorithm>
 #include <map>
 #include <string>
 #include <vector>
 
 #include "base/files/file_path.h"
@@ skipping 272 matching lines @@
   item_first->Activate(0);
   item_last->Activate(0);
   item_first->Activate(0);
 
   const ScopedVector<arc::FakeArcBridgeService::Request>& launch_requests =
       bridge_service()->launch_requests();
   EXPECT_EQ(static_cast<size_t>(3), launch_requests.size());
   EXPECT_EQ(true, launch_requests[0]->IsForApp(app_first));
   EXPECT_EQ(true, launch_requests[1]->IsForApp(app_last));
   EXPECT_EQ(true, launch_requests[2]->IsForApp(app_first));
+
+  // Test an attempt to launch of a not-ready app.
+  bridge_service()->SendRefreshAppList(std::vector<arc::AppInfo>());
+  item_first = FindArcItem(GetAppId(app_first));
+  ASSERT_NE(nullptr, item_first);
+  size_t launch_request_count_before =
+      bridge_service()->launch_requests().size();
+  item_first->Activate(0);
+  // Number of launch requests must not change.
+  EXPECT_EQ(launch_request_count_before,
+            bridge_service()->launch_requests().size());
 }
 
 TEST_F(ArcAppModelBuilderTest, RequestIcons) {
   // Make sure we are on UI thread.
   ASSERT_EQ(true,
             content::BrowserThread::CurrentlyOn(content::BrowserThread::UI));
 
   bridge_service()->SetReady();
   bridge_service()->SendRefreshAppList(fake_apps());
 
@@ skipping 87 matching lines @@
 
   // Validate that icons are installed, have right content and icon is
   // refreshed for ARC app item.
   EXPECT_EQ(true, base::PathExists(icon_path));
 
   std::string icon_data;
   // Read the file from disk and compare with reference data.
   EXPECT_EQ(true, base::ReadFileToString(icon_path, &icon_data));
   ASSERT_EQ(icon_data, png_data);
 }