scheduler: Don't access weak pointers on foreign threads

content/renderer/scheduler/task_queue_manager_unittest.cc

Index: content/renderer/scheduler/task_queue_manager_unittest.cc
diff --git a/content/renderer/scheduler/task_queue_manager_unittest.cc b/content/renderer/scheduler/task_queue_manager_unittest.cc
index 0106eb23d52513d7a254cc310c86e273b7fb9789..43238250180c20cc6b776a94ab0f7f2e548f9d80 100644
--- a/content/renderer/scheduler/task_queue_manager_unittest.cc
+++ b/content/renderer/scheduler/task_queue_manager_unittest.cc
@@ -5,6 +5,7 @@
 #include "content/renderer/scheduler/task_queue_manager.h"
 
 #include "base/test/test_simple_task_runner.h"
+#include "base/threading/thread.h"
 #include "content/renderer/scheduler/task_queue_selector.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
@@ -327,5 +328,31 @@ TEST_F(TaskQueueManagerTest, NoTasksAfterShutdown) {
   EXPECT_TRUE(run_order.empty());
 }
 
+void PostTaskToRunner(scoped_refptr<base::SingleThreadTaskRunner> runner,
+                      std::vector<int>* run_order) {
+  runner->PostTask(FROM_HERE, base::Bind(&TestTask, 1, run_order));
+}
+
+TEST_F(TaskQueueManagerTest, PostFromThread) {
+  base::MessageLoop message_loop;
+  selector_ = make_scoped_ptr(new SelectorForTest);
+  manager_ = make_scoped_ptr(
+      new TaskQueueManager(1u, message_loop.task_runner(), selector_.get()));
+
+  std::vector<int> run_order;
+  scoped_refptr<base::SingleThreadTaskRunner> runner =
+      manager_->TaskRunnerForQueue(0);
+
+  base::Thread thread("TestThread");
+  thread.Start();
+  thread.message_loop()->PostTask(
+      FROM_HERE, base::Bind(&PostTaskToRunner, runner, &run_order));
+  thread.Stop();
+
+  selector_->AppendQueueToService(0);
+  message_loop.RunUntilIdle();
+  EXPECT_EQ(1, run_order[0]);
+}
+
 }  // namespace
 }  // namespace content