Mark setInnerHTML as a TrustedHTML sink

This ensures Trusted Types are aware of setInnerHTML as a
powerful sink.

Bug: 1042130
Change-Id: I292acc3081e26aa42f101442fb778635d0c79649
Reviewed-on: https://chromium-review.googlesource.com/c/chromium/src/+/2536082
Auto-Submit: Mason Freed <masonfreed@chromium.org>
Commit-Queue: Joey Arhar <jarhar@chromium.org>
Reviewed-by: Joey Arhar <jarhar@chromium.org>
Cr-Commit-Position: refs/heads/master@{#827179}

third_party/blink/renderer/core/dom/element.idl

@@ -97,7 +97,7 @@ callback ScrollStateCallback = void (ScrollState scrollState);
     [CEReactions, CustomElementCallbacks, RaisesException] void insertAdjacentHTML(DOMString position, HTMLString text);
 
     // Declarative Shadow DOM setInnerHTML/getInnerHTML() functions.
-    [Affects=Nothing, RuntimeEnabled=DeclarativeShadowDOM, RuntimeCallStatsCounter=ElementSetInnerHTML, RaisesException, ImplementedAs=setInnerHTMLWithOptions] void setInnerHTML(DOMString html, optional SetInnerHTMLOptions options = {});
+    [Affects=Nothing, RuntimeEnabled=DeclarativeShadowDOM, RuntimeCallStatsCounter=ElementSetInnerHTML, RaisesException, ImplementedAs=setInnerHTMLWithOptions] void setInnerHTML(HTMLString html, optional SetInnerHTMLOptions options = {});
     [Affects=Nothing, RuntimeEnabled=DeclarativeShadowDOM, RuntimeCallStatsCounter=ElementGetInnerHTML] HTMLString getInnerHTML(optional GetInnerHTMLOptions options = {});
 
     // Pointer Lock

third_party/blink/renderer/core/dom/shadow_root.idl

@@ -38,7 +38,7 @@ interface ShadowRoot : DocumentFragment {
 
     // Declarative Shadow DOM setInnerHTML function.
     // TODO(crbug.com/1147752): Add getInnerHTML() here also.
-    [Affects=Nothing, RuntimeEnabled=DeclarativeShadowDOM, RaisesException, ImplementedAs=setInnerHTMLWithOptions] void setInnerHTML(DOMString html, optional SetInnerHTMLOptions options = {});
+    [Affects=Nothing, RuntimeEnabled=DeclarativeShadowDOM, RaisesException, ImplementedAs=setInnerHTMLWithOptions] void setInnerHTML(HTMLString html, optional SetInnerHTMLOptions options = {});
 };
 
 ShadowRoot includes DocumentOrShadowRoot;