Merge SendTask implementation for SingleThreadedTaskQueueForTesting and TaskQueueForTest

That allows to use SingleThreadedTaskQueueForTesting via TaskQueueBase interface
but still have access to test-only SendTask function.

Bug: webrtc:10933
Change-Id: I3cc397e55ea2f1ed9e5d885d6a2ccda412beb826
Reviewed-on: https://webrtc-review.googlesource.com/c/src/+/156002
Reviewed-by: Karl Wiberg <kwiberg@webrtc.org>
Commit-Queue: Danil Chapovalov <danilchap@webrtc.org>
Cr-Commit-Position: refs/heads/master@{#29480}
diff --git a/rtc_base/BUILD.gn b/rtc_base/BUILD.gn
index 564989a..896076b 100644
--- a/rtc_base/BUILD.gn
+++ b/rtc_base/BUILD.gn
@@ -1077,8 +1077,10 @@
   deps = [
     ":checks",
     ":macromagic",
+    ":rtc_base_approved",
     ":rtc_event",
     ":rtc_task_queue",
+    "../api/task_queue",
     "../api/task_queue:default_task_queue_factory",
     "task_utils:to_queued_task",
     "//third_party/abseil-cpp/absl/strings",
diff --git a/rtc_base/synchronization/sequence_checker_unittest.cc b/rtc_base/synchronization/sequence_checker_unittest.cc
index 00b847c..1e62e97 100644
--- a/rtc_base/synchronization/sequence_checker_unittest.cc
+++ b/rtc_base/synchronization/sequence_checker_unittest.cc
@@ -84,16 +84,20 @@
   SequenceChecker sequence_checker;
   sequence_checker.Detach();
   TaskQueueForTest queue;
-  queue.SendTask([&] { EXPECT_TRUE(sequence_checker.IsCurrent()); });
+  queue.SendTask([&] { EXPECT_TRUE(sequence_checker.IsCurrent()); },
+                 RTC_FROM_HERE);
 }
 
 TEST(SequenceCheckerTest, DetachFromTaskQueueAndUseOnThread) {
   TaskQueueForTest queue;
-  queue.SendTask([] {
-    SequenceChecker sequence_checker;
-    sequence_checker.Detach();
-    RunOnDifferentThread([&] { EXPECT_TRUE(sequence_checker.IsCurrent()); });
-  });
+  queue.SendTask(
+      [] {
+        SequenceChecker sequence_checker;
+        sequence_checker.Detach();
+        RunOnDifferentThread(
+            [&] { EXPECT_TRUE(sequence_checker.IsCurrent()); });
+      },
+      RTC_FROM_HERE);
 }
 
 TEST(SequenceCheckerTest, MethodNotAllowedOnDifferentThreadInDebug) {
@@ -106,7 +110,8 @@
   SequenceChecker sequence_checker;
   TaskQueueForTest queue;
   queue.SendTask(
-      [&] { EXPECT_EQ(sequence_checker.IsCurrent(), !RTC_DCHECK_IS_ON); });
+      [&] { EXPECT_EQ(sequence_checker.IsCurrent(), !RTC_DCHECK_IS_ON); },
+      RTC_FROM_HERE);
 }
 
 TEST(SequenceCheckerTest, DetachFromTaskQueueInDebug) {
@@ -114,13 +119,15 @@
   sequence_checker.Detach();
 
   TaskQueueForTest queue1;
-  queue1.SendTask([&] { EXPECT_TRUE(sequence_checker.IsCurrent()); });
+  queue1.SendTask([&] { EXPECT_TRUE(sequence_checker.IsCurrent()); },
+                  RTC_FROM_HERE);
 
   // IsCurrent should return false in debug builds after moving to
   // another task queue.
   TaskQueueForTest queue2;
   queue2.SendTask(
-      [&] { EXPECT_EQ(sequence_checker.IsCurrent(), !RTC_DCHECK_IS_ON); });
+      [&] { EXPECT_EQ(sequence_checker.IsCurrent(), !RTC_DCHECK_IS_ON); },
+      RTC_FROM_HERE);
 }
 
 class TestAnnotations {
@@ -147,7 +154,7 @@
 void TestAnnotationsOnWrongQueue() {
   TestAnnotations annotations;
   TaskQueueForTest queue;
-  queue.SendTask([&] { annotations.ModifyTestVar(); });
+  queue.SendTask([&] { annotations.ModifyTestVar(); }, RTC_FROM_HERE);
 }
 
 #if RTC_DCHECK_IS_ON
diff --git a/rtc_base/task_queue_for_test.h b/rtc_base/task_queue_for_test.h
index be91c50..40fc9c8 100644
--- a/rtc_base/task_queue_for_test.h
+++ b/rtc_base/task_queue_for_test.h
@@ -14,14 +14,27 @@
 #include <utility>
 
 #include "absl/strings/string_view.h"
+#include "api/task_queue/task_queue_base.h"
 #include "rtc_base/checks.h"
 #include "rtc_base/event.h"
+#include "rtc_base/location.h"
 #include "rtc_base/task_queue.h"
 #include "rtc_base/task_utils/to_queued_task.h"
 #include "rtc_base/thread_annotations.h"
 
 namespace webrtc {
 
+template <typename Closure>
+void SendTask(TaskQueueBase* task_queue, Closure&& task, rtc::Location loc) {
+  RTC_CHECK(!task_queue->IsCurrent())
+      << "Called SendTask to a queue from the same queue at " << loc.ToString();
+  rtc::Event event;
+  task_queue->PostTask(
+      ToQueuedTask(std::forward<Closure>(task), [&event] { event.Set(); }));
+  RTC_CHECK(event.Wait(/*give_up_after_ms=*/120'000, /*warn_after_ms=*/10'000))
+      << "Waited too long at " << loc.ToString();
+}
+
 class RTC_LOCKABLE TaskQueueForTest : public rtc::TaskQueue {
  public:
   using rtc::TaskQueue::TaskQueue;
@@ -38,7 +51,7 @@
   // task queue (i.e. the Run() method always returns |false|.).
   template <class Closure>
   void SendTask(Closure* task) {
-    RTC_DCHECK(!IsCurrent());
+    RTC_CHECK(!IsCurrent());
     rtc::Event event;
     PostTask(ToQueuedTask(
         [&task] { RTC_CHECK_EQ(false, static_cast<QueuedTask*>(task)->Run()); },
@@ -49,12 +62,8 @@
   // A convenience, test-only method that blocks the current thread while
   // a task executes on the task queue.
   template <class Closure>
-  void SendTask(Closure&& task) {
-    RTC_DCHECK(!IsCurrent());
-    rtc::Event event;
-    PostTask(
-        ToQueuedTask(std::forward<Closure>(task), [&event] { event.Set(); }));
-    event.Wait(rtc::Event::kForever);
+  void SendTask(Closure&& task, rtc::Location loc) {
+    ::webrtc::SendTask(Get(), std::forward<Closure>(task), loc);
   }
 };
 
diff --git a/rtc_base/weak_ptr_unittest.cc b/rtc_base/weak_ptr_unittest.cc
index 9e22312..0757a1d 100644
--- a/rtc_base/weak_ptr_unittest.cc
+++ b/rtc_base/weak_ptr_unittest.cc
@@ -204,7 +204,7 @@
 std::unique_ptr<T> NewObjectCreatedOnTaskQueue() {
   std::unique_ptr<T> obj;
   webrtc::TaskQueueForTest queue("NewObjectCreatedOnTaskQueue");
-  queue.SendTask([&] { obj = std::make_unique<T>(); });
+  queue.SendTask([&] { obj = std::make_unique<T>(); }, RTC_FROM_HERE);
   return obj;
 }
 
@@ -226,11 +226,13 @@
   // Create weak ptr on main thread
   WeakPtr<Target> weak_ptr = target->factory.GetWeakPtr();
   webrtc::TaskQueueForTest queue("queue");
-  queue.SendTask([&] {
-    // Dereference and invalide weak_ptr on another thread.
-    EXPECT_EQ(weak_ptr.get(), target.get());
-    target.reset();
-  });
+  queue.SendTask(
+      [&] {
+        // Dereference and invalide weak_ptr on another thread.
+        EXPECT_EQ(weak_ptr.get(), target.get());
+        target.reset();
+      },
+      RTC_FROM_HERE);
 }
 
 }  // namespace rtc