Web Inspector: Add tests for DOM highlight commands

Web Inspector: Add tests for DOM highlight commands
https://bugs.webkit.org/show_bug.cgi?id=148786

Patch by Joseph Pecoraro <pecoraro@apple.com> on 2015-09-04
Reviewed by Timothy Hatcher.

Source/WebCore:

Tests: inspector/dom/hideHighlight.html
       inspector/dom/highlightFrame.html
       inspector/dom/highlightNode.html
       inspector/dom/highlightQuad.html
       inspector/dom/highlightRect.html

* inspector/InspectorDOMAgent.cpp:
(WebCore::InspectorDOMAgent::highlightNode):
(WebCore::InspectorDOMAgent::highlightFrame):
Include an error if a frame is not found.

* inspector/InspectorOverlay.cpp:
(WebCore::InspectorOverlay::highlightQuad):
Should have been checking the usePageCoordinates state of the incoming
highlight configuration, not the one that will be replaced.

LayoutTests:

* inspector/dom/hideHighlight-expected.txt: Added.
* inspector/dom/hideHighlight.html: Added.
* inspector/dom/highlightFrame-expected.txt: Added.
* inspector/dom/highlightFrame.html: Added.
* inspector/dom/highlightNode-expected.txt: Added.
* inspector/dom/highlightNode.html: Added.
* inspector/dom/highlightQuad-expected.txt: Added.
* inspector/dom/highlightQuad.html: Added.
* inspector/dom/highlightRect-expected.txt: Added.
* inspector/dom/highlightRect.html: Added.
* inspector/dom/highlightSelector-expected.txt:
* inspector/dom/highlightSelector.html:
* inspector/dom/resources/highlight-iframe.html: Renamed from LayoutTests/inspector/dom/resources/highlightSelector-iframe.html.

git-svn-id: https://svn.webkit.org/repository/webkit/trunk@189416 268f45cc-cd09-0410-ab3c-d52691b4dbfc