Move drag related functions present in LocalFrame.cpp to correct files.

third_party/WebKit/Source/core/page/DragController.cpp

Index: third_party/WebKit/Source/core/page/DragController.cpp
diff --git a/third_party/WebKit/Source/core/page/DragController.cpp b/third_party/WebKit/Source/core/page/DragController.cpp
index f5b309f22885e32fba7350c4a339df37498dde52..06c544bed155ed543989635af499616f2a07917d 100644
--- a/third_party/WebKit/Source/core/page/DragController.cpp
+++ b/third_party/WebKit/Source/core/page/DragController.cpp
@@ -76,6 +76,7 @@
 #include "platform/graphics/BitmapImage.h"
 #include "platform/graphics/Image.h"
 #include "platform/graphics/ImageOrientation.h"
+#include "platform/graphics/paint/PaintRecordBuilder.h"
 #include "platform/loader/fetch/ResourceFetcher.h"
 #include "platform/loader/fetch/ResourceRequest.h"
 #include "platform/weborigin/SecurityOrigin.h"
@@ -1080,6 +1081,29 @@ static std::unique_ptr<DragImage> DragImageForLink(
   return drag_image;
 }
 
+// static
+std::unique_ptr<DragImage> DragController::DragImageForSelection(
+    const LocalFrame& frame,
+    float opacity) {
+  if (!frame.Selection().ComputeVisibleSelectionInDOMTreeDeprecated().IsRange())
+    return nullptr;
+
+  frame.View()->UpdateAllLifecyclePhasesExceptPaint();
+  DCHECK(frame.GetDocument()->IsActive());
+
+  FloatRect painting_rect = FloatRect(frame.Selection().Bounds());
+  GlobalPaintFlags paint_flags =
+      kGlobalPaintSelectionOnly | kGlobalPaintFlattenCompositingLayers;
+
+  PaintRecordBuilder builder(
+      DataTransfer::DeviceSpaceBounds(painting_rect, frame));
+  frame.View()->PaintContents(builder.Context(), paint_flags,
+                              EnclosingIntRect(painting_rect));
+  return DataTransfer::CreateDragImageForFrame(
+      frame, opacity, kDoNotRespectImageOrientation, painting_rect, builder,
+      PropertyTreeState::Root());
+}
+
 bool DragController::StartDrag(LocalFrame* src,
                                const DragState& state,
                                const WebMouseEvent& drag_event,