[BlobAsync] Renderer support for blob file writing.

content/child/blob_storage/blob_transport_controller_unittest.cc

Index: content/child/blob_storage/blob_transport_controller_unittest.cc
diff --git a/content/child/blob_storage/blob_transport_controller_unittest.cc b/content/child/blob_storage/blob_transport_controller_unittest.cc
index 08120fcaca7c23a4809d5c3410fbaed9240baf77..89f3c2890320dc87b9abbd390f013850b4459415 100644
--- a/content/child/blob_storage/blob_transport_controller_unittest.cc
+++ b/content/child/blob_storage/blob_transport_controller_unittest.cc
@@ -7,13 +7,23 @@
 #include <stddef.h>
 #include <stdint.h>
 
-#include "base/memory/ptr_util.h"
+#include "base/bind.h"
+#include "base/bind_helpers.h"
+#include "base/files/file.h"
+#include "base/files/file_path.h"
+#include "base/files/file_util.h"
 #include "base/memory/shared_memory.h"
+#include "base/message_loop/message_loop.h"
+#include "base/process/process_handle.h"
+#include "base/test/test_file_util.h"
 #include "base/test/test_simple_task_runner.h"
+#include "base/thread_task_runner_handle.h"
 #include "base/tuple.h"
 #include "content/child/blob_storage/blob_consolidation.h"
 #include "content/child/thread_safe_sender.h"
 #include "content/common/fileapi/webblob_messages.h"
+#include "ipc/ipc_message.h"
+#include "ipc/ipc_platform_file.h"
 #include "ipc/ipc_sender.h"
 #include "ipc/ipc_sync_message_filter.h"
 #include "ipc/ipc_test_sink.h"
@@ -22,9 +32,13 @@
 #include "testing/gmock/include/gmock/gmock.h"
 #include "testing/gtest/include/gtest/gtest.h"
 
+using base::File;
+using base::FilePath;
+using base::TestSimpleTaskRunner;
 using storage::BlobItemBytesRequest;
 using storage::BlobItemBytesResponse;
 using storage::DataElement;
+using storage::IPCBlobCreationCancelCode;
 
 namespace content {
 namespace {
@@ -87,13 +101,28 @@ static blink::WebThreadSafeData CreateData(const std::string& str) {
 
 class BlobTransportControllerTest : public testing::Test {
  public:
-  BlobTransportControllerTest()
-      : io_thread_runner_(new base::TestSimpleTaskRunner()),
-        main_thread_runner_(new OtherThreadTestSimpleTaskRunner()) {}
+  BlobTransportControllerTest() : thread_runner_handle_(io_thread_runner_) {}
 
   void SetUp() override {
     sender_ = new BlobTransportControllerTestSender(&sink_);
-    BlobTransportController::GetInstance()->ClearForTesting();
+    BlobTransportController::GetInstance()->CancelAllBlobTransfers();
+  }
+
+  void OnMemoryRequest(
+      BlobTransportController* holder,
+      const std::string uuid,
+      const std::vector<storage::BlobItemBytesRequest>& requests,
+      std::vector<base::SharedMemoryHandle>* memory_handles,
+      std::vector<IPC::PlatformFileForTransit> file_handles) {
+    holder->OnMemoryRequest(uuid, requests, memory_handles, file_handles,
+                            file_thread_runner_.get(), &sink_);
+  }
+
+  FilePath CreateTemporaryFile() {
+    FilePath path;
+    EXPECT_TRUE(base::CreateTemporaryFile(&path));
+    files_opened_.push_back(path);
+    return path;
   }
 
   void ExpectRegisterAndStartMessage(const std::string& expected_uuid,
@@ -117,16 +146,62 @@ class BlobTransportControllerTest : public testing::Test {
       *descriptions = base::get<1>(start_contents);
     // We don't have dispositions from the renderer.
     EXPECT_TRUE(base::get<2>(register_contents).empty());
+    sink_.ClearMessages();
+  }
+
+  void ExpectMemoryResponses(
+      const std::string& expected_uuid,
+      std::vector<storage::BlobItemBytesResponse> expected_responses) {
+    const IPC::Message* responses_message =
+        sink_.GetUniqueMessageMatching(BlobStorageMsg_MemoryItemResponse::ID);
+    ASSERT_TRUE(responses_message);
+    base::Tuple<std::string, std::vector<storage::BlobItemBytesResponse>>
+        responses_content;
+    BlobStorageMsg_MemoryItemResponse::Read(responses_message,
+                                            &responses_content);
+    EXPECT_EQ(expected_uuid, base::get<0>(responses_content));
+    EXPECT_EQ(expected_responses, base::get<1>(responses_content));
+    sink_.ClearMessages();
+  }
+
+  void ExpectCancel(const std::string& expected_uuid,
+                    storage::IPCBlobCreationCancelCode expected_code) {
+    const IPC::Message* cancel_message =
+        sink_.GetUniqueMessageMatching(BlobStorageMsg_CancelBuildingBlob::ID);
+    ASSERT_TRUE(cancel_message);
+    base::Tuple<std::string, storage::IPCBlobCreationCancelCode> cancel_content;
+    BlobStorageMsg_CancelBuildingBlob::Read(cancel_message, &cancel_content);
+    EXPECT_EQ(expected_uuid, base::get<0>(cancel_content));
+    EXPECT_EQ(expected_code, base::get<1>(cancel_content));
   }
 
   void TearDown() override {
-    BlobTransportController::GetInstance()->ClearForTesting();
+    BlobTransportController::GetInstance()->CancelAllBlobTransfers();
+    for (const FilePath& path : files_opened_) {
+      EXPECT_TRUE(base::DeleteFile(path, false));
+    }
+    EXPECT_FALSE(io_thread_runner_->HasPendingTask());
+    EXPECT_FALSE(file_thread_runner_->HasPendingTask());
+    EXPECT_FALSE(main_thread_runner_->HasPendingTask());
   }
 
+ protected:
+  std::vector<FilePath> files_opened_;
+
   IPC::TestSink sink_;
   scoped_refptr<BlobTransportControllerTestSender> sender_;
-  scoped_refptr<base::TestSimpleTaskRunner> io_thread_runner_;
-  scoped_refptr<OtherThreadTestSimpleTaskRunner> main_thread_runner_;
+
+  // Thread runners.
+  scoped_refptr<base::TestSimpleTaskRunner> io_thread_runner_ =
+      new TestSimpleTaskRunner();
+  scoped_refptr<base::TestSimpleTaskRunner> file_thread_runner_ =
+      new TestSimpleTaskRunner();
+  scoped_refptr<OtherThreadTestSimpleTaskRunner> main_thread_runner_ =
+      new OtherThreadTestSimpleTaskRunner();
+
+  // We set this to the IO thread runner, as this is used for the
+  // OnMemoryRequest calls, which are on that thread.
+  base::ThreadTaskRunnerHandle thread_runner_handle_;
 };
 
 TEST_F(BlobTransportControllerTest, Descriptions) {
@@ -136,7 +211,7 @@ TEST_F(BlobTransportControllerTest, Descriptions) {
   const size_t kShortcutSize = 11;
 
   // The first two data elements should be combined and the data shortcut.
-  std::unique_ptr<BlobConsolidation> consolidation(new BlobConsolidation());
+  scoped_refptr<BlobConsolidation> consolidation(new BlobConsolidation());
   consolidation->AddBlobItem(KRefBlobUUID, 10, 10);
   consolidation->AddDataItem(CreateData("Hello"));
   consolidation->AddDataItem(CreateData("Hello2"));
@@ -156,14 +231,13 @@ TEST_F(BlobTransportControllerTest, Descriptions) {
 }
 
 TEST_F(BlobTransportControllerTest, Responses) {
-  using ResponsesStatus = BlobTransportController::ResponsesStatus;
   const std::string kBlobUUID = "uuid";
   const std::string KRefBlobUUID = "refuuid";
   const std::string kBadBlobUUID = "uuuidBad";
   BlobTransportController* holder = BlobTransportController::GetInstance();
 
   // The first two data elements should be combined.
-  BlobConsolidation* consolidation = new BlobConsolidation();
+  scoped_refptr<BlobConsolidation> consolidation = new BlobConsolidation();
   consolidation->AddBlobItem(KRefBlobUUID, 10, 10);
   consolidation->AddDataItem(CreateData("Hello"));
   consolidation->AddDataItem(CreateData("Hello2"));
@@ -171,57 +245,44 @@ TEST_F(BlobTransportControllerTest, Responses) {
   consolidation->AddDataItem(CreateData("Hello3"));
   // See the above test for the expected descriptions layout.
 
-  holder->blob_storage_[kBlobUUID] = base::WrapUnique(consolidation);
+  holder->blob_storage_[kBlobUUID] = consolidation;
 
   std::vector<BlobItemBytesRequest> requests;
   std::vector<base::SharedMemoryHandle> memory_handles;
   std::vector<IPC::PlatformFileForTransit> file_handles;
-  std::vector<storage::BlobItemBytesResponse> output;
 
   // Request for all of first data
   requests.push_back(BlobItemBytesRequest::CreateIPCRequest(0, 1, 0, 11));
-  EXPECT_EQ(ResponsesStatus::SUCCESS,
-            holder->GetResponses(kBlobUUID, requests, &memory_handles,
-                                 file_handles, &output));
-  EXPECT_EQ(1u, output.size());
+  OnMemoryRequest(holder, kBlobUUID, requests, &memory_handles, file_handles);
   std::vector<storage::BlobItemBytesResponse> expected;
   expected.push_back(ResponseWithData(0, "HelloHello2"));
-  EXPECT_EQ(expected, output);
+  ExpectMemoryResponses(kBlobUUID, expected);
 
   // Part of second data
-  output.clear();
   requests[0] = BlobItemBytesRequest::CreateIPCRequest(1000, 3, 1, 5);
-  EXPECT_EQ(ResponsesStatus::SUCCESS,
-            holder->GetResponses(kBlobUUID, requests, &memory_handles,
-                                 file_handles, &output));
-  EXPECT_EQ(1u, output.size());
+  OnMemoryRequest(holder, kBlobUUID, requests, &memory_handles, file_handles);
   expected.clear();
   expected.push_back(ResponseWithData(1000, "ello3"));
-  EXPECT_EQ(expected, output);
+  ExpectMemoryResponses(kBlobUUID, expected);
 
   // Both data segments
-  output.clear();
   requests[0] = BlobItemBytesRequest::CreateIPCRequest(0, 1, 0, 11);
   requests.push_back(BlobItemBytesRequest::CreateIPCRequest(1, 3, 0, 6));
-  EXPECT_EQ(ResponsesStatus::SUCCESS,
-            holder->GetResponses(kBlobUUID, requests, &memory_handles,
-                                 file_handles, &output));
-  EXPECT_EQ(2u, output.size());
+  OnMemoryRequest(holder, kBlobUUID, requests, &memory_handles, file_handles);
   expected.clear();
   expected.push_back(ResponseWithData(0, "HelloHello2"));
   expected.push_back(ResponseWithData(1, "Hello3"));
-  EXPECT_EQ(expected, output);
+  ExpectMemoryResponses(kBlobUUID, expected);
 }
 
 TEST_F(BlobTransportControllerTest, SharedMemory) {
-  using ResponsesStatus = BlobTransportController::ResponsesStatus;
   const std::string kBlobUUID = "uuid";
   const std::string KRefBlobUUID = "refuuid";
   const std::string kBadBlobUUID = "uuuidBad";
   BlobTransportController* holder = BlobTransportController::GetInstance();
 
   // The first two data elements should be combined.
-  BlobConsolidation* consolidation = new BlobConsolidation();
+  scoped_refptr<BlobConsolidation> consolidation = new BlobConsolidation();
   consolidation->AddBlobItem(KRefBlobUUID, 10, 10);
   consolidation->AddDataItem(CreateData("Hello"));
   consolidation->AddDataItem(CreateData("Hello2"));
@@ -229,12 +290,11 @@ TEST_F(BlobTransportControllerTest, SharedMemory) {
   consolidation->AddDataItem(CreateData("Hello3"));
   // See the above test for the expected descriptions layout.
 
-  holder->blob_storage_[kBlobUUID] = base::WrapUnique(consolidation);
+  holder->blob_storage_[kBlobUUID] = consolidation;
 
   std::vector<BlobItemBytesRequest> requests;
   std::vector<base::SharedMemoryHandle> memory_handles;
   std::vector<IPC::PlatformFileForTransit> file_handles;
-  std::vector<storage::BlobItemBytesResponse> output;
 
   // Request for all data in shared memory
   requests.push_back(
@@ -248,14 +308,11 @@ TEST_F(BlobTransportControllerTest, SharedMemory) {
   CHECK(base::SharedMemory::NULLHandle() != handle);
   memory_handles.push_back(handle);
 
-  EXPECT_EQ(ResponsesStatus::SUCCESS,
-            holder->GetResponses(kBlobUUID, requests, &memory_handles,
-                                 file_handles, &output));
-  EXPECT_EQ(2u, output.size());
+  OnMemoryRequest(holder, kBlobUUID, requests, &memory_handles, file_handles);
   std::vector<storage::BlobItemBytesResponse> expected;
   expected.push_back(BlobItemBytesResponse(0));
   expected.push_back(BlobItemBytesResponse(1));
-  EXPECT_EQ(expected, output);
+  ExpectMemoryResponses(kBlobUUID, expected);
   std::string expected_memory = "HelloHello2Hello3";
   const char* mem_location = static_cast<const char*>(memory.memory());
   std::vector<char> value(mem_location, mem_location + memory.requested_size());
@@ -263,7 +320,71 @@ TEST_F(BlobTransportControllerTest, SharedMemory) {
                                                expected_memory.size()));
 }
 
-TEST_F(BlobTransportControllerTest, TestPublicMethods) {
+TEST_F(BlobTransportControllerTest, Disk) {
+  const std::string kBlobUUID = "uuid";
+  const std::string KRefBlobUUID = "refuuid";

[michaeln, 2016/04/28 00:16:57]

K --> k

[dmurph, 2016/05/09 19:55:47]

Done.

+  const std::string kBadBlobUUID = "uuuidBad";
+  BlobTransportController* holder = BlobTransportController::GetInstance();
+  FilePath path1 = CreateTemporaryFile();
+  File file(path1, File::FLAG_OPEN | File::FLAG_WRITE | File::FLAG_READ);
+  ASSERT_TRUE(file.IsValid());
+  ASSERT_TRUE(file.SetLength(11 + 6));
+  // The first two data elements should be combined.
+  scoped_refptr<BlobConsolidation> consolidation(new BlobConsolidation());
+  consolidation->AddBlobItem(KRefBlobUUID, 10, 10);
+  consolidation->AddDataItem(CreateData("Hello"));
+  consolidation->AddDataItem(CreateData("Hello2"));
+  consolidation->AddBlobItem(KRefBlobUUID, 0, 10);
+  consolidation->AddDataItem(CreateData("Hello3"));

[michaeln, 2016/04/28 00:16:57]

maybe factor the constants and test consolidation setup out into class members
and a helper method, i think it's replicated 3 times

[dmurph, 2016/05/09 19:55:47]

Done.

+  // See the above test for the expected descriptions layout.
+  holder->blob_storage_[kBlobUUID] = consolidation;
+  holder->main_thread_runner_ = main_thread_runner_;
+  std::vector<BlobItemBytesRequest> requests;
+  std::vector<base::SharedMemoryHandle> memory_handles;
+  std::vector<IPC::PlatformFileForTransit> file_handles;
+  // Request for all data in shared memory

[michaeln, 2016/04/28 00:16:57]

should the comment say 'files'?

[dmurph, 2016/05/09 19:55:47]

Done.

+  requests.push_back(
+      BlobItemBytesRequest::CreateFileRequest(0, 1, 0, 11, 0, 0));
+  requests.push_back(
+      BlobItemBytesRequest::CreateFileRequest(1, 3, 0, 6, 0, 11));
+  file_handles.push_back(IPC::TakePlatformFileForTransit(std::move(file)));
+  OnMemoryRequest(holder, kBlobUUID, requests, &memory_handles, file_handles);
+  EXPECT_TRUE(file_thread_runner_->HasPendingTask());
+  EXPECT_FALSE(io_thread_runner_->HasPendingTask());
+  file_thread_runner_->RunPendingTasks();
+  EXPECT_FALSE(file_thread_runner_->HasPendingTask());
+  EXPECT_TRUE(io_thread_runner_->HasPendingTask());
+  io_thread_runner_->RunPendingTasks();
+  std::vector<storage::BlobItemBytesResponse> expected = {
+      BlobItemBytesResponse(0), BlobItemBytesResponse(1)};
+  ExpectMemoryResponses(kBlobUUID, expected);
+  std::string expected_memory = "HelloHello2Hello3";
+  file = IPC::PlatformFileForTransitToFile(file_handles[0]);
+  file_handles.clear();
+  char data[11 + 6];
+  file.Read(0, data, 11 + 6);
+  std::vector<char> value(data, data + 11 + 6);
+  EXPECT_THAT(value, testing::ElementsAreArray(expected_memory.c_str(),
+                                               expected_memory.size()));
+
+  // Finally, test that we get errors correctly.
+  FilePath path2 = CreateTemporaryFile();
+  EXPECT_TRUE(base::MakeFileUnwritable(path2));
+  File file2(path2, File::FLAG_OPEN | File::FLAG_WRITE);
+  EXPECT_FALSE(file2.IsValid());
+  file_handles.push_back(IPC::TakePlatformFileForTransit(std::move(file2)));
+  OnMemoryRequest(holder, kBlobUUID, requests, &memory_handles, file_handles);
+  EXPECT_TRUE(file_thread_runner_->HasPendingTask());
+  file_thread_runner_->RunPendingTasks();
+  EXPECT_TRUE(io_thread_runner_->HasPendingTask());
+  io_thread_runner_->RunPendingTasks();
+  // Clear the main thread task, as it has the AddRef job.
+  EXPECT_TRUE(main_thread_runner_->HasPendingTask());
+  main_thread_runner_->ClearPendingTasks();
+  ExpectCancel(kBlobUUID, IPCBlobCreationCancelCode::FILE_WRITE_FAILED);
+}
+
+TEST_F(BlobTransportControllerTest, PublicMethods) {
   const std::string kBlobUUID = "uuid";
   const std::string kBlobContentType = "content_type";
   const std::string kBlob2UUID = "uuid2";
@@ -272,10 +393,10 @@ TEST_F(BlobTransportControllerTest, TestPublicMethods) {
   std::vector<DataElement> message_descriptions;
   BlobTransportController* holder = BlobTransportController::GetInstance();
 
-  BlobConsolidation* consolidation = new BlobConsolidation();
+  scoped_refptr<BlobConsolidation> consolidation = new BlobConsolidation();
   consolidation->AddBlobItem(KRefBlobUUID, 10, 10);
   BlobTransportController::InitiateBlobTransfer(
-      kBlobUUID, kBlobContentType, base::WrapUnique(consolidation), sender_,
+      kBlobUUID, kBlobContentType, consolidation, sender_,
       io_thread_runner_.get(), main_thread_runner_);
   // Check that we have the 'increase ref' pending task.
   EXPECT_TRUE(main_thread_runner_->HasPendingTask());
@@ -290,11 +411,9 @@ TEST_F(BlobTransportControllerTest, TestPublicMethods) {
   EXPECT_FALSE(holder->IsTransporting(kBlobUUID));
   io_thread_runner_->RunPendingTasks();
   EXPECT_TRUE(holder->IsTransporting(kBlobUUID));
-  base::Tuple<std::string, std::vector<DataElement>> message_contents;
   EXPECT_EQ(MakeBlobElement(KRefBlobUUID, 10, 10), message_descriptions[0]);
 
-  holder->OnCancel(kBlobUUID,
-                   storage::IPCBlobCreationCancelCode::OUT_OF_MEMORY);
+  holder->OnCancel(kBlobUUID, IPCBlobCreationCancelCode::OUT_OF_MEMORY);
   EXPECT_FALSE(holder->IsTransporting(kBlobUUID));
   // Check we have the 'decrease ref' task.
   EXPECT_TRUE(main_thread_runner_->HasPendingTask());
@@ -302,10 +421,10 @@ TEST_F(BlobTransportControllerTest, TestPublicMethods) {
   sink_.ClearMessages();
 
   // Add the second.
-  BlobConsolidation* consolidation2 = new BlobConsolidation();
+  scoped_refptr<BlobConsolidation> consolidation2 = new BlobConsolidation();
   consolidation2->AddBlobItem(KRefBlobUUID, 10, 10);
   BlobTransportController::InitiateBlobTransfer(
-      kBlob2UUID, kBlob2ContentType, base::WrapUnique(consolidation2), sender_,
+      kBlob2UUID, kBlob2ContentType, consolidation2, sender_,
       io_thread_runner_.get(), main_thread_runner_);
   EXPECT_TRUE(main_thread_runner_->HasPendingTask());
   main_thread_runner_->ClearPendingTasks();
@@ -321,28 +440,57 @@ TEST_F(BlobTransportControllerTest, TestPublicMethods) {
   main_thread_runner_->ClearPendingTasks();
 }
 
-TEST_F(BlobTransportControllerTest, ResponsesErrors) {
-  using ResponsesStatus = BlobTransportController::ResponsesStatus;
+TEST_F(BlobTransportControllerTest, MemoryResponsesPublicMethod) {

[michaeln, 2016/04/28 00:16:57]

Maybe this test and the Responses test could be merged? Now that the public
method is more of a one-stop-shop this test seems like it may be redundant.

[dmurph, 2016/05/09 19:55:47]

Done.

   const std::string kBlobUUID = "uuid";
-  const std::string KRefBlobUUID = "refuuid";
-  const std::string kBadBlobUUID = "uuuidBad";
+  const std::string kBlobContentType = "content_type";
+  const std::string kData = "HelloHello2Hello3";
+  const int kDataSize = 17;
+  // Here we test that we receive data responses when we request them.
   BlobTransportController* holder = BlobTransportController::GetInstance();
 
-  BlobConsolidation* consolidation = new BlobConsolidation();
-  consolidation->AddBlobItem(KRefBlobUUID, 10, 10);
+  scoped_refptr<BlobConsolidation> consolidation(new BlobConsolidation());
+  // These items should be combined.
+  consolidation->AddDataItem(CreateData("Hello"));
+  consolidation->AddDataItem(CreateData("Hello2"));
+  consolidation->AddDataItem(CreateData("Hello3"));
+  BlobTransportController::InitiateBlobTransfer(
+      kBlobUUID, kBlobContentType, consolidation, sender_,
+      io_thread_runner_.get(), main_thread_runner_);
+  // Check that we have the 'increase ref' pending task.
+  EXPECT_TRUE(main_thread_runner_->HasPendingTask());
+  // Check that we have the 'store' pending task.
+  EXPECT_TRUE(io_thread_runner_->HasPendingTask());
+  // Check that we've sent the data.
+  std::vector<DataElement> message_descriptions;
+  ExpectRegisterAndStartMessage(kBlobUUID, kBlobContentType,
+                                &message_descriptions);
+  main_thread_runner_->ClearPendingTasks();
 
-  holder->blob_storage_[kBlobUUID] = base::WrapUnique(consolidation);
+  // Check that we got the correct start message.
+  EXPECT_FALSE(holder->IsTransporting(kBlobUUID));
+  io_thread_runner_->RunPendingTasks();
+  EXPECT_TRUE(holder->IsTransporting(kBlobUUID));
+  ASSERT_EQ(1u, message_descriptions.size());
+  EXPECT_EQ(MakeDataElement("HelloHello2Hello3"), message_descriptions[0]);
+  EXPECT_FALSE(main_thread_runner_->HasPendingTask());
 
+  // Now we request the memory.
   std::vector<BlobItemBytesRequest> requests;
   std::vector<base::SharedMemoryHandle> memory_handles;
   std::vector<IPC::PlatformFileForTransit> file_handles;
-  std::vector<storage::BlobItemBytesResponse> output;
-
-  // Error conditions
-  EXPECT_EQ(ResponsesStatus::BLOB_NOT_FOUND,
-            holder->GetResponses(kBadBlobUUID, requests, &memory_handles,
-                                 file_handles, &output));
-  EXPECT_EQ(0u, output.size());
+  requests.push_back(
+      BlobItemBytesRequest::CreateIPCRequest(0, 0, 0, kDataSize));
+  OnMemoryRequest(holder, kBlobUUID, requests, &memory_handles, file_handles);
+
+  std::vector<BlobItemBytesResponse> expected_responses;
+  BlobItemBytesResponse expected(0);
+  expected.inline_data = std::vector<char>(kData.begin(), kData.end());
+  expected_responses.push_back(expected);
+  ExpectMemoryResponses(kBlobUUID, expected_responses);
+  EXPECT_FALSE(main_thread_runner_->HasPendingTask());
+  holder->OnDone(kBlobUUID);
+  EXPECT_TRUE(main_thread_runner_->HasPendingTask());
+  main_thread_runner_->ClearPendingTasks();
 }
 
 }  // namespace content