Merge "Add mock leashes for dimLayer and stage roots for 2 app flex split" into main

        when(mSplitLayout.getDividerLeash()).thenReturn(dividerLeash);

        mRootTask = new TestRunningTaskInfoBuilder().build();

        SurfaceControl rootLeash = new SurfaceControl.Builder().setName("test").build();

        SurfaceControl rootLeash = new SurfaceControl.Builder().setName("splitRoot").build();

        mStageCoordinator.onTaskAppeared(mRootTask, rootLeash);

        mSideStage.mRootTaskInfo = new TestRunningTaskInfoBuilder().build();

        mMainStage.mRootTaskInfo = new TestRunningTaskInfoBuilder().build();

        SurfaceControl mainRootLeash = new SurfaceControl.Builder().setName("mainRoot").build();

        SurfaceControl sideRootLeash = new SurfaceControl.Builder().setName("sideRoot").build();

        mMainStage.mRootLeash = mainRootLeash;

        mSideStage.mRootLeash = sideRootLeash;

        SurfaceControl mainDimLayer = new SurfaceControl.Builder().setName("mainDim").build();

        SurfaceControl sideDimLayer = new SurfaceControl.Builder().setName("sideDim").build();

        mMainStage.mDimLayer = mainDimLayer;

        mSideStage.mDimLayer = sideDimLayer;

        doReturn(mock(SplitDecorManager.class)).when(mMainStage).getSplitDecorManager();

        doReturn(mock(SplitDecorManager.class)).when(mSideStage).getSplitDecorManager();