ozone/wayland: set OsExchangeDataProvider factory.

Enabling ozone_unittests on linux bots revealed some problems
with downcasting. In particular, linux-ubsan-vptr bot started to
fail with the following error message -

./../ui/ozone/platform/wayland/host/wayland_data_drag_controller.cc:515:10: runtime error: downcast of address 0x2ccc00349e00 which does not point to an object of type 'const WaylandExchangeDataProvider'
0x2ccc00349e00: note: object is of type 'ui::OSExchangeDataProviderNonBacked'
 00 00 00 00  28 3b f6 e3 f0 55 00 00  01 00 00 00 00 00 00 00  20 b1 26 00 cc 2c 00 00  28 00 00 00
              ^~~~~~~~~~~~~~~~~~~~~~~
              vptr for 'ui::OSExchangeDataProviderNonBacked'
    #0 0x55f0e331831c in GetOfferedExchangeDataProvider ui/ozone/platform/wayland/host/wayland_data_drag_controller.cc:515:10
    #1 0x55f0e331831c in ui::WaylandDataDragController::StartSession(ui::OSExchangeData const&, int, ui::mojom::DragEventSource) ui/ozone/platform/wayland/host/wayland_data_drag_controller.cc:133:23
    #2 0x55f0e3366bbc in ui::WaylandWindow::StartDrag(ui::OSExchangeData const&, int, ui::mojom::DragEventSource, ui::Cursor, bool, base::OnceCallback<void (ui::mojom::DragOperation)>, ui::WmDragHandler::LocationDelegate*) ui/ozone/platform/wayland/host/wayland_window.cc:227:45
    #3 0x55f0e2b28c32 in ui::WaylandDataDragControllerTest_AsyncNoopStartDrag_Test::TestBody() ui/ozone/platform/wayland/host/wayland_data_drag_controller_unittest.cc:973:28
    #4 0x55f0e2e26ab1 in testing::Test::Run() third_party/googletest/src/googletest/src/gtest.cc:2670:5
    #5 0x55f0e2e28046 in testing::TestInfo::Run() third_party/googletest/src/googletest/src/gtest.cc:2849:11
    #6 0x55f0e2e29beb in testing::TestSuite::Run() third_party/googletest/src/googletest/src/gtest.cc:3008:30
    #7 0x55f0e2e3fafe in testing::internal::UnitTestImpl::RunAllTests() third_party/googletest/src/googletest/src/gtest.cc:5866:44
    #8 0x55f0e2e3e604 in testing::UnitTest::Run() third_party/googletest/src/googletest/src/gtest.cc:5440:10
    #9 0x55f0e34276d1 in RUN_ALL_TESTS third_party/googletest/src/googletest/include/gtest/gtest.h:2284:73
    #10 0x55f0e34276d1 in base::TestSuite::Run() base/test/test_suite.cc:463:16
    #11 0x55f0e342b9dc in Run base/callback.h:145:12
    #12 0x55f0e342b9dc in base::(anonymous namespace)::LaunchUnitTestsInternal(base::OnceCallback<int ()>, unsigned long, int, unsigned long, bool, base::RepeatingCallback<void ()>, base::OnceCallback<void ()>) base/test/launcher/unit_test_launcher.cc:181:38
    #13 0x55f0e342b877 in base::LaunchUnitTests(int, char**, base::OnceCallback<int ()>, unsigned long) base/test/launcher/unit_test_launcher.cc:272:10
    #14 0x55f0e2acc2cc in main mojo/core/test/run_all_unittests.cc:69:10
    #15 0x7ff7560d4082 in __libc_start_main /build/glibc-SzIz7B/glibc-2.31/csu/../csu/libc-start.c:308:16
    #16 0x55f0e2ab4169 in _start (/home/msisov/code/chromium/src/out/asan/ozone_unittests+0xb13169) (BuildId: 77bfee5b71bd92da)

It turned out that WaylandDataDragController was getting a non-backed provider
as a Wayland one wasn't set (it's set during OzonePlatformWayland initialization
in production). As a result, downcasting to WaylandExchangeDataProvider
was illegal in tests. It's unknown why tests didn't fail. Probably,
the result of the WaylandDataDragController::GetOfferedExchangeDataProvider
was never used. And the problem with downcasting was only caught with
this new bot.

Bug: 1358123
Change-Id: I4c8deb16a57b485de1fabd91fdcaab136d5da639
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/3865512
Commit-Queue: Maksim Sisov <msisov@igalia.com>
Reviewed-by: Alexander Dunaev <adunaev@igalia.com>
Cr-Commit-Position: refs/heads/main@{#1041976}

ui/ozone/platform/wayland/test/wayland_drag_drop_test.cc

@@ -25,6 +25,21 @@ using testing::_;
 
 namespace ui {
 
+TestWaylandOSExchangeDataProvideFactory::
+    TestWaylandOSExchangeDataProvideFactory() {
+  SetInstance(this);
+}
+
+TestWaylandOSExchangeDataProvideFactory::
+    ~TestWaylandOSExchangeDataProvideFactory() {
+  SetInstance(nullptr);
+}
+
+std::unique_ptr<OSExchangeDataProvider>
+TestWaylandOSExchangeDataProvideFactory::CreateProvider() {
+  return std::make_unique<WaylandExchangeDataProvider>();
+}
+
 WaylandDragDropTest::WaylandDragDropTest() = default;
 
 WaylandDragDropTest::~WaylandDragDropTest() = default;

ui/ozone/platform/wayland/test/wayland_drag_drop_test.h

@@ -10,6 +10,7 @@
 #include "base/callback_forward.h"
 #include "base/memory/raw_ptr.h"
 #include "testing/gmock/include/gmock/gmock.h"
+#include "ui/base/dragdrop/os_exchange_data_provider_factory_ozone.h"
 #include "ui/ozone/platform/wayland/test/test_data_device.h"
 #include "ui/ozone/platform/wayland/test/test_data_source.h"
 #include "ui/ozone/platform/wayland/test/wayland_test.h"
@@ -27,6 +28,15 @@ namespace ui {
 
 class WaylandWindow;
 
+class TestWaylandOSExchangeDataProvideFactory
+    : public OSExchangeDataProviderFactoryOzone {
+ public:
+  TestWaylandOSExchangeDataProvideFactory();
+  ~TestWaylandOSExchangeDataProvideFactory() override;
+
+  std::unique_ptr<OSExchangeDataProvider> CreateProvider() override;
+};
+
 // Base class for Wayland drag-and-drop tests. Public methods allow test code to
 // emulate dnd-related events from the test compositor and can be used in both
 // data and window dragging test cases.
@@ -100,6 +110,9 @@ class WaylandDragDropTest : public WaylandTest,
   raw_ptr<wl::TestTouch> touch_;
 
   uint32_t current_serial_;
+
+ private:
+  TestWaylandOSExchangeDataProvideFactory os_exchange_factory_;
 };
 
 }  // namespace ui