Improving direction-based selection strategy.

Source/core/editing/FrameSelection.cpp

Index: Source/core/editing/FrameSelection.cpp
diff --git a/Source/core/editing/FrameSelection.cpp b/Source/core/editing/FrameSelection.cpp
index bd543e092efd3523f8d6e061a854a05476e39954..7e09daef0e618b3380f3281811a901912014736d 100644
--- a/Source/core/editing/FrameSelection.cpp
+++ b/Source/core/editing/FrameSelection.cpp
@@ -1938,12 +1938,13 @@ GranularityStrategy* FrameSelection::granularityStrategy()
     return m_granularityStrategy.get();
 }
 
-void FrameSelection::moveRangeSelectionExtent(const VisiblePosition& extentPosition)
+void FrameSelection::moveRangeSelectionExtent(const IntPoint& contentsPoint)
 {
-    if (isNone() || m_selection.visibleBase() == extentPosition)
+    TRACE_EVENT0("blink", "FrameSelection::moveRangeSelectionExtent");
+    if (isNone())
         return;
 
-    VisibleSelection newSelection = granularityStrategy()->updateExtent(extentPosition, selection());
+    VisibleSelection newSelection = granularityStrategy()->updateExtent(contentsPoint, m_frame);
     setSelection(
         newSelection,
         FrameSelection::CloseTyping | FrameSelection::ClearTypingStyle | FrameSelection::DoNotClearStrategy | UserTriggered,