https://bugs.webkit.org/show_bug.cgi?id=125072

Reviewed by Joseph Pecoraro.

Add a new WebInspector.Rect.prototype.pad() method which does not alter
the rectangle it's called and returns a new rect much like .inset(). I've
checked all call sites and there was no reuse of the rectangle that was
padded so this patch won't have any side effects.

* UserInterface/Breakpoint.js:
(WebInspector.Breakpoint.prototype._showEditBreakpointPopover):
* UserInterface/CSSStyleDeclarationTextEditor.js:
* UserInterface/Geometry.js:
(WebInspector.Rect.prototype.pad):
* UserInterface/LayerTreeSidebarPanel.js:
(WebInspector.LayerTreeSidebarPanel.prototype._updatePopoverForSelectedNode):
* UserInterface/SourceCodeTextEditor.js:
(WebInspector.SourceCodeTextEditor.prototype._showPopover):
* UserInterface/TimelineDataGrid.js:
(WebInspector.TimelineDataGrid.prototype._updatePopoverForSelectedNode):


git-svn-id: http://svn.webkit.org/repository/webkit/trunk@159946 268f45cc-cd09-0410-ab3c-d52691b4dbfc