Hi @xiaochengh, i will take this up and do the required changes. Thanks

Thanks, tanvir.rizvi@. I'm assigning myself as the virtual owner.

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/857d0cf0147891b495e4df5260bb1e51be5e3980

commit 857d0cf0147891b495e4df5260bb1e51be5e3980
Author: tanvir.rizvi <tanvir.rizvi@samsung.com>
Date: Thu Jun 08 07:39:01 2017

Rename CreateDragImage to CreateDragImageForFrame to avoid name conflicts

Rename CreateDragImage to CreateDragImageForFrame to avoid name
conflicts and add TODO for movement of drag related functionality
out of LocalFrame class.
These functionalities are independent of core functionality of
LocalFrame so these can be moved out of LocalFrame.

BUG= 727981 

Review-Url: https://codereview.chromium.org/2924013002
Cr-Commit-Position: refs/heads/master@{#477919}

[modify] https://crrev.com/857d0cf0147891b495e4df5260bb1e51be5e3980/third_party/WebKit/Source/core/frame/LocalFrame.cpp

This is still in progress...

The following revision refers to this bug:
  https://chromium.googlesource.com/chromium/src.git/+/ee841c26ab77ca0aebd65ad839167b2178b7ecde

commit ee841c26ab77ca0aebd65ad839167b2178b7ecde
Author: tanvir.rizvi <tanvir.rizvi@samsung.com>
Date: Wed Jun 21 01:41:55 2017

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

Move class DraggedNodeImageBuilder, DataTransfer::NodeImage(),
DataTransfer::DeviceSpaceBounds(), DataTransfer::CreateDragImageForFrame()
to DataTransfer.cpp.
Move DragController::DragImageForSelection() to DragController.cpp.

BUG= 727981 

Review-Url: https://codereview.chromium.org/2950793002
Cr-Commit-Position: refs/heads/master@{#481067}

[modify] https://crrev.com/ee841c26ab77ca0aebd65ad839167b2178b7ecde/third_party/WebKit/Source/core/clipboard/DataTransfer.cpp
[modify] https://crrev.com/ee841c26ab77ca0aebd65ad839167b2178b7ecde/third_party/WebKit/Source/core/frame/LocalFrame.cpp
[modify] https://crrev.com/ee841c26ab77ca0aebd65ad839167b2178b7ecde/third_party/WebKit/Source/core/page/DragController.cpp

Thanks for the work!