Move drag related functionality out of LocalFrame

Move drag related functionality out of LocalFrame

Class DraggedNodeImageBuilder, and functions DeviceSpaceBounds,
CreateDragImageForFrame, NodeImage and DragImageForSelection are currently
implemented in LocalFrame class, but these functions are irrelevant to
LocalFrame, so these functions are moved to appropriate drag related
files.

BUG=727981

[tanvir, 2017-06-13 08:20:03]

Description was changed from

==========
Move drag related functionality out of LocalFrame

Class DraggedNodeImageBuilder, and functions DeviceSpaceBounds,
CreateDragImageForFrame, NodeImage and DragImageForSelection are currently
implemented in LocalFrame class, but these functions are irrelevant to
LocalFrame, so these functions are moved to appropriate drag related
files.

BUG=727981
==========

to

==========
Move drag related functionality out of LocalFrame

Class DraggedNodeImageBuilder, and functions DeviceSpaceBounds,
CreateDragImageForFrame, NodeImage and DragImageForSelection are currently
implemented in LocalFrame class, but these functions are irrelevant to
LocalFrame, so these functions are moved to appropriate drag related
files.

BUG=727981
==========

[tanvir, 2017-06-13 08:20:03]

tanvir.rizvi@samsung.com changed reviewers:
+ xiaochengh@chromium.org

[tanvir, 2017-06-13 08:22:11]

Hi Xiaochengh,
PTAL!!!. 
I have created a new patch for this( reference patch is
https://codereview.chromium.org/2916043002/ .) I will abandon the reference
patch. 
Thanks.

[Shanmuga Pandi, 2017-06-13 08:31:13]

The CQ bit was checked by shanmuga.m@samsung.com to run a CQ dry run

[commit-bot: I haz the power, 2017-06-13 08:31:36]

Dry run: CQ is trying da patch.

Follow status at:
https://chromium-cq-status.appspot.com/v2/patch-status/codereview.chromium.or...

[commit-bot: I haz the power, 2017-06-13 11:05:13]

The CQ bit was unchecked by commit-bot@chromium.org

[commit-bot: I haz the power, 2017-06-13 11:05:14]

Dry run: This issue passed the CQ dry run.

[Xiaocheng, 2017-06-13 17:54:17]

Could you split it into two patches?

Patch 1: Modify the functions in-place (in LocalFrame.cpp), without moving them
to a different file. The reason is that when moving a function from LocalFrame
to, say, DragController, its parameters must be changed. Changing the function
in-place make it easier to compare the code change.

Patch 2: Move the modified functions to other files. This patch is pure code
moving without any change (other than fixing includes and/or forward
declarations).

Thanks!