Bug 1794974: Part 5: Add code that requests new cache domains to remote accessibles, r=Jamie

This revision adds code everywhere necessary to request cache domains. These
requests are a response to assistive technology queries. The revision also adds
asserts and other safety mechanisms to ensure that we have the right information
before responding. If an AT requests something that Gecko doesn't have an answer
for, we return a default value and hope they'll ask again once we have the info.

Differential Revision: https://phabricator.services.mozilla.com/D220039

Author: Nathan LaPre

accessible/base/CachedTableAccessible.cpp

@@ -277,6 +277,9 @@ TableAccessible* CachedTableCellAccessible::Table() const {
 
 uint32_t CachedTableCellAccessible::ColExtent() const {
   if (RemoteAccessible* remoteAcc = mAcc->AsRemote()) {
+    if (RequestDomainsIfInactive(CacheDomain::Table)) {
+      return 1;
+    }
     if (remoteAcc->mCachedFields) {
       if (auto colSpan = remoteAcc->mCachedFields->GetAttribute<int32_t>(
               CacheKey::ColSpan)) {
@@ -300,6 +303,9 @@ uint32_t CachedTableCellAccessible::ColExtent() const {
 
 uint32_t CachedTableCellAccessible::RowExtent() const {
   if (RemoteAccessible* remoteAcc = mAcc->AsRemote()) {
+    if (RequestDomainsIfInactive(CacheDomain::Table)) {
+      return 1;
+    }
     if (remoteAcc->mCachedFields) {
       if (auto rowSpan = remoteAcc->mCachedFields->GetAttribute<int32_t>(
               CacheKey::RowSpan)) {
@@ -323,6 +329,9 @@ uint32_t CachedTableCellAccessible::RowExtent() const {
 
 UniquePtr<AccIterable> CachedTableCellAccessible::GetExplicitHeadersIterator() {
   if (RemoteAccessible* remoteAcc = mAcc->AsRemote()) {
+    if (RequestDomainsIfInactive(CacheDomain::Table)) {
+      return nullptr;
+    }
     if (remoteAcc->mCachedFields) {
       if (auto headers =
               remoteAcc->mCachedFields->GetAttribute<nsTArray<uint64_t>>(
@@ -342,6 +351,9 @@ void CachedTableCellAccessible::ColHeaderCells(nsTArray<Accessible*>* aCells) {
   if (!table) {
     return;
   }
+  if (mAcc->IsRemote() && RequestDomainsIfInactive(CacheDomain::Table)) {
+    return;
+  }
   if (auto iter = GetExplicitHeadersIterator()) {
     while (Accessible* header = iter->Next()) {
       role headerRole = header->Role();

accessible/base/TextLeafRange.cpp

@@ -1490,6 +1490,9 @@ void TextLeafPoint::AddTextOffsetAttributes(AccAttributes* aAttrs) const {
 
   RemoteAccessible* acc = mAcc->AsRemote();
   MOZ_ASSERT(acc);
+  if (RequestDomainsIfInactive(CacheDomain::TextOffsetAttributes)) {
+    return;
+  }
   if (!acc->mCachedFields) {
     return;
   }
@@ -1603,6 +1606,9 @@ TextLeafPoint TextLeafPoint::FindTextOffsetAttributeSameAcc(
 
   RemoteAccessible* acc = mAcc->AsRemote();
   MOZ_ASSERT(acc);
+  if (RequestDomainsIfInactive(CacheDomain::TextOffsetAttributes)) {
+    return TextLeafPoint();
+  }
   if (!acc->mCachedFields) {
     return TextLeafPoint();
   }
@@ -1962,6 +1968,9 @@ LayoutDeviceIntRect TextLeafPoint::CharBounds() {
     return bounds;
   }
 
+  if (RequestDomainsIfInactive(CacheDomain::TextBounds)) {
+    return LayoutDeviceIntRect();
+  }
   RemoteAccessible* remote = mAcc->AsRemote();
   nsRect charBounds = remote->GetCachedCharRect(mOffset);
   if (!charBounds.IsEmpty()) {