Ensure valid VisiblePosition input for character{Before,After}

third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp

Index: third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp
diff --git a/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp b/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp
index b1aeec7fd9d8236fcd8c1c0089d897830bf0f9da..dd422c7a00ed50d29be7fdb2ea0d494b67ab01dd 100644
--- a/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp
+++ b/third_party/WebKit/Source/core/editing/commands/CompositeEditCommand.cpp
@@ -770,12 +770,15 @@ void CompositeEditCommand::prepareWhitespaceAtPositionForSplit(Position& positio
     // Delete collapsed whitespace so that inserting nbsps doesn't uncollapse it.
     Position upstreamPos = mostBackwardCaretPosition(position);
     deleteInsignificantText(upstreamPos, mostForwardCaretPosition(position));
-    position = mostForwardCaretPosition(upstreamPos);
 
-    VisiblePosition visiblePos = createVisiblePositionDeprecated(position);
+    document().updateStyleAndLayoutIgnorePendingStylesheets();
+    position = mostForwardCaretPosition(upstreamPos);
+    VisiblePosition visiblePos = createVisiblePosition(position);
     VisiblePosition previousVisiblePos = previousPositionOf(visiblePos);
     replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(previousVisiblePos);
-    replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(visiblePos);
+
+    document().updateStyleAndLayoutIgnorePendingStylesheets();
+    replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(createVisiblePosition(position));
 }
 
 void CompositeEditCommand::replaceCollapsibleWhitespaceWithNonBreakingSpaceIfNeeded(const VisiblePosition& visiblePosition)