Bug 1083635. Part 7: Fix UpdateLayerTree to sync-decode images and flush pending notifications. r=mattwoodrow

--HG--
extra : rebase_source : d13f993c4dd1b868f47b6c79b39172bb40b3871c

dom/base/nsDOMWindowUtils.cpp

@@ -275,8 +275,13 @@ NS_IMETHODIMP
 nsDOMWindowUtils::UpdateLayerTree()
 {
   if (nsIPresShell* presShell = GetPresShell()) {
+    presShell->FlushPendingNotifications(Flush_Display);
     nsRefPtr<nsViewManager> vm = presShell->GetViewManager();
-    vm->ProcessPendingUpdates();
+    nsView* view = vm->GetRootView();
+    if (view) {
+      presShell->Paint(view, view->GetBounds(),
+          nsIPresShell::PAINT_LAYERS | nsIPresShell::PAINT_SYNC_DECODE_IMAGES);
+    }
   }
   return NS_OK;
 }

layout/base/nsIPresShell.h

@@ -1424,6 +1424,8 @@ public:
     PAINT_LAYERS = 0x01,
     /* Composite layers to the window. */
     PAINT_COMPOSITE = 0x02,
+    /* Sync-decode images. */
+    PAINT_SYNC_DECODE_IMAGES = 0x04
   };
   virtual void Paint(nsView* aViewToPaint, const nsRegion& aDirtyRegion,
                      uint32_t aFlags) = 0;

layout/base/nsPresShell.cpp

@@ -6270,7 +6270,8 @@ PresShell::Paint(nsView*        aViewToPaint,
       NS_WARNING("Must complete empty transaction when compositing!");
     }
 
-    if (!(frame->GetStateBits() & NS_FRAME_UPDATE_LAYER_TREE) &&
+    if (!(aFlags & PAINT_SYNC_DECODE_IMAGES) &&
+        !(frame->GetStateBits() & NS_FRAME_UPDATE_LAYER_TREE) &&
         !mNextPaintCompressed) {
       NotifySubDocInvalidationFunc computeInvalidFunc =
         presContext->MayHavePaintEventListenerInSubDocument() ? nsPresContext::NotifySubDocInvalidation : 0;
@@ -6323,6 +6324,9 @@ PresShell::Paint(nsView*        aViewToPaint,
   if (!(aFlags & PAINT_COMPOSITE)) {
     flags |= nsLayoutUtils::PAINT_NO_COMPOSITE;
   }
+  if (aFlags & PAINT_SYNC_DECODE_IMAGES) {
+    flags |= nsLayoutUtils::PAINT_SYNC_DECODE_IMAGES;
+  }
   if (mNextPaintCompressed) {
     flags |= nsLayoutUtils::PAINT_COMPRESSED;
     mNextPaintCompressed = false;