Implement ShadowRoot.delegatesFocus 2/4 (slide focus on mouse click)

LayoutTests/fast/dom/shadow/focus-slide-on-shadow-host-expected.txt

Index: LayoutTests/fast/dom/shadow/focus-slide-on-shadow-host-expected.txt
diff --git a/LayoutTests/fast/dom/shadow/focus-slide-on-shadow-host-expected.txt b/LayoutTests/fast/dom/shadow/focus-slide-on-shadow-host-expected.txt
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index 0000000000000000000000000000000000000000..f1a8a3cfe2a9c62e43abb29ab20fd065322bcd22
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+++ b/LayoutTests/fast/dom/shadow/focus-slide-on-shadow-host-expected.txt
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+Click inside focusable shadow host should focus the host.
+
+On success, you will see a series of "PASS" messages, followed by "TEST COMPLETE".
+
+
+click on inner div should focus shadow host
+PASS innermost active element is shadowHost
+PASS innermost active element is shadowHost/inputA
+PASS innermost active element is shadowHost
+PASS innermost active element is shadowHost
+click on inner div should focus inner focusable (with delegatesFocus = true)
+PASS innermost active element is shadowHost/inputA
+PASS inputA.selectionStart is 0
+PASS inputA.selectionEnd is 9
+PASS innermost active element is shadowHost/inputA
+PASS inputA.selectionStart is 0
+PASS inputA.selectionEnd is 9
+PASS innermost active element is shadowHost/inputA
+PASS innermost active element is shadowHost/inputA
+PASS inputA.selectionStart is 1
+PASS inputA.selectionEnd is 1
+PASS innermost active element is shadowHost/inputB
+PASS innermost active element is shadowHost/inputB
+PASS inputB.selectionStart is 1
+PASS inputB.selectionEnd is 1
+PASS successfullyParsed is true
+
+TEST COMPLETE
+
+