Add prefix to empty param tests.

googletest will no longer support empty prefix
for parameterized INSTANTIATE_TEST_SUITE_P.
Adding "All" prefix to existing empty prefix test suites.

This CL was uploaded by git cl split.

R=xdai@chromium.org

Bug: 1023677
Change-Id: I2a37dba9dcad0551d09a8d3df6d35403785a3c9c
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/1927054
Auto-Submit: Ilia Samsonov <isamsonov@google.com>
Reviewed-by: Xiaoqian Dai <xdai@chromium.org>
Commit-Queue: Xiaoqian Dai <xdai@chromium.org>
Cr-Commit-Position: refs/heads/master@{#717215}

ash/wm/splitview/split_view_controller_unittest.cc

@@ -4801,11 +4801,11 @@ TEST_P(SplitViewAppDraggingTest, BackdropBoundsDuringDrag) {
   EXPECT_EQ(backdrop_window->bounds(), active_desk_container->bounds());
 }
 
-INSTANTIATE_TEST_SUITE_P(, SplitViewControllerTest, testing::Bool());
-INSTANTIATE_TEST_SUITE_P(, SplitViewTabDraggingTest, testing::Bool());
-INSTANTIATE_TEST_SUITE_P(,
+INSTANTIATE_TEST_SUITE_P(All, SplitViewControllerTest, testing::Bool());
+INSTANTIATE_TEST_SUITE_P(All, SplitViewTabDraggingTest, testing::Bool());
+INSTANTIATE_TEST_SUITE_P(All,
                          SplitViewTabDraggingTestWithClamshellSupport,
                          testing::Bool());
-INSTANTIATE_TEST_SUITE_P(, SplitViewAppDraggingTest, testing::Bool());
+INSTANTIATE_TEST_SUITE_P(All, SplitViewAppDraggingTest, testing::Bool());
 
 }  // namespace ash