Always elevate input method above the input target.

        // immediately receive the same treatment, e.g. to be above the dock divider.

        layer = assignAndIncreaseLayerIfNeeded(mReplacingWindow, layer);

        layer = assignAndIncreaseLayerIfNeeded(mPinnedWindow, layer);

        final WindowState inputMethodTarget = mService.mInputMethodTarget;

        // There might be no applications windows yet, so we need to make sure we uplift the input

        // method above the target.

        layer = Math.max(layer,

                inputMethodTarget != null ? inputMethodTarget.mWinAnimator.mAnimLayer + 1 : 0);

        layer = assignAndIncreaseLayerIfNeeded(mImeWindow, layer);

    }