Bug 1758811 - P3: Don't push cache when gecko cache is available. r=Jamie

This requires a little bit of decoupling of dispatching
WINDOW_CONTENT_CHANGED events when the content changes.

Differential Revision: https://phabricator.services.mozilla.com/D140751

accessible/android/AccessibleWrap.cpp

@@ -28,6 +28,7 @@
 
 #include "mozilla/a11y/PDocAccessibleChild.h"
 #include "mozilla/jni/GeckoBundleUtils.h"
+#include "mozilla/StaticPrefs_accessibility.h"
 
 // icu TRUE conflicting with java::sdk::Boolean::TRUE()
 // https://searchfox.org/mozilla-central/rev/ce02064d8afc8673cef83c92896ee873bd35e7ae/intl/icu/source/common/unicode/umachine.h#265
@@ -213,6 +214,9 @@ nsresult AccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
 
       if (state & states::BUSY) {
         sessionAcc->SendWindowStateChangedEvent(accessible);
+        if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
+          sessionAcc->SendWindowContentChangedEvent();
+        }
       }
       break;
     }
@@ -229,6 +233,12 @@ nsresult AccessibleWrap::HandleAccEvent(AccEvent* aEvent) {
                                         event->Priority());
       break;
     }
+    case nsIAccessibleEvent::EVENT_REORDER: {
+      if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
+        sessionAcc->SendWindowContentChangedEvent();
+      }
+      break;
+    }
     default:
       break;
   }

accessible/android/DocAccessibleWrap.cpp

@@ -18,6 +18,7 @@
 #include "TraversalRule.h"
 #include "mozilla/PresShell.h"
 #include "mozilla/a11y/DocAccessiblePlatformExtChild.h"
+#include "mozilla/StaticPrefs_accessibility.h"
 
 using namespace mozilla;
 using namespace mozilla::a11y;
@@ -201,6 +202,9 @@ void DocAccessibleWrap::CacheViewportCallback(nsITimer* aTimer,
 }
 
 void DocAccessibleWrap::CacheViewport(bool aCachePivotBoundaries) {
+  if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
+    return;
+  }
   mCachePivotBoundaries |= aCachePivotBoundaries;
   if (VirtualViewID() == kNoID && !mCacheRefreshTimer) {
     NS_NewTimerWithFuncCallback(getter_AddRefs(mCacheRefreshTimer),
@@ -225,6 +229,10 @@ DocAccessibleWrap* DocAccessibleWrap::GetTopLevelContentDoc(
 }
 
 void DocAccessibleWrap::CacheFocusPath(AccessibleWrap* aAccessible) {
+  if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
+    return;
+  }
+
   mFocusPath.Clear();
   if (IPCAccessibilityActive()) {
     DocAccessibleChild* ipcDoc = IPCDoc();
@@ -263,6 +271,10 @@ void DocAccessibleWrap::CacheFocusPath(AccessibleWrap* aAccessible) {
 }
 
 void DocAccessibleWrap::UpdateFocusPathBounds() {
+  if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
+    return;
+  }
+
   if (!mFocusPath.Count()) {
     return;
   }

accessible/android/Platform.cpp

@@ -10,6 +10,7 @@
 #include "SessionAccessibility.h"
 #include "mozilla/a11y/RemoteAccessible.h"
 #include "mozilla/Components.h"
+#include "mozilla/StaticPrefs_accessibility.h"
 #include "nsIAccessibleEvent.h"
 #include "nsIAccessiblePivot.h"
 #include "nsIStringBundle.h"
@@ -64,6 +65,13 @@ void a11y::ProxyEvent(RemoteAccessible* aTarget, uint32_t aEventType) {
     case nsIAccessibleEvent::EVENT_FOCUS:
       sessionAcc->SendFocusEvent(WrapperFor(aTarget));
       break;
+    case nsIAccessibleEvent::EVENT_REORDER:
+      if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
+        sessionAcc->SendWindowContentChangedEvent();
+      }
+      break;
+    default:
+      break;
   }
 }
 
@@ -96,6 +104,9 @@ void a11y::ProxyStateChangeEvent(RemoteAccessible* aTarget, uint64_t aState,
 
   if (aState & states::BUSY) {
     sessionAcc->SendWindowStateChangedEvent(WrapperFor(aTarget));
+    if (StaticPrefs::accessibility_cache_enabled_AtStartup()) {
+      sessionAcc->SendWindowContentChangedEvent();
+    }
   }
 }
 

accessible/android/SessionAccessibility.cpp

@@ -275,6 +275,7 @@ void SessionAccessibility::SendScrollingEvent(AccessibleWrap* aAccessible,
   mSessionAccessibility->SendEvent(
       java::sdk::AccessibilityEvent::TYPE_VIEW_SCROLLED, virtualViewId,
       aAccessible->AndroidClass(), eventInfo);
+  SendWindowContentChangedEvent();
 }
 
 void SessionAccessibility::SendWindowContentChangedEvent() {
@@ -485,7 +486,6 @@ void SessionAccessibility::UpdateCachedBounds(
   }
 
   mSessionAccessibility->UpdateCachedBounds(infos);
-  SendWindowContentChangedEvent();
 }
 
 void SessionAccessibility::UpdateAccessibleFocusBoundaries(