cros: Disable two UIPerformanceTests.

TabletModeTransitionTest.EnterExit and HomeScreenTest.DragginPerformance
are failing on Linux ASAN bots. We will probably be removing them
sometime soon but for now, keep the bots happy by disabling.

TBR=xiyuan@chromium.org

Test: none
Bug: 1057864
Change-Id: Ib434d6295289a0795dd25cc15ac6c150b57bde6b
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2083939Reviewed-by: Sammie Quon <sammiequon@chromium.org>
Commit-Queue: Sammie Quon <sammiequon@chromium.org>
Cr-Commit-Position: refs/heads/master@{#746200}

chrome/browser/ui/ash/homescreen_interactive_uitest.cc

@@ -48,7 +48,7 @@ class HomescreenTest : public UIPerformanceTest {
       cmd->RemoveSwitch(wm::switches::kWindowAnimationsDisabled);
   }
   std::vector<std::string> GetUMAHistogramNames() const override {
-      return {"Ash.Homescreen.AnimationSmoothness"};
+    return {"Ash.Homescreen.AnimationSmoothness"};
   }
 };
 
@@ -108,7 +108,8 @@ class HomescreenDragTest : public HomescreenTest {
   base::test::ScopedFeatureList scoped_features_;
 };
 
-IN_PROC_BROWSER_TEST_F(HomescreenDragTest, DraggingPerformance) {
+// TODO(http://crbug.com/1057864): Disabled due to flakiness.
+IN_PROC_BROWSER_TEST_F(HomescreenDragTest, DISABLED_DraggingPerformance) {
   // First show the launcher so we can do drags.
   BrowserView* browser_view = BrowserView::GetBrowserViewForBrowser(browser());
   aura::Window* browser_window = browser_view->GetWidget()->GetNativeWindow();

chrome/browser/ui/ash/tablet_mode_transition_interactive_uitest.cc

@@ -61,7 +61,8 @@ class TabletModeTransitionTest : public UIPerformanceTest {
   DISALLOW_COPY_AND_ASSIGN(TabletModeTransitionTest);
 };
 
-IN_PROC_BROWSER_TEST_F(TabletModeTransitionTest, EnterExit) {
+// TODO(http://crbug.com/1057864): Disabled due to flakiness.
+IN_PROC_BROWSER_TEST_F(TabletModeTransitionTest, DISABLED_EnterExit) {
   // Activate the first window. The top window is the only window which animates
   // and is the one we should check to see if the tablet animation has finished.
   Browser* browser = BrowserList::GetInstance()->GetLastActive();