[EFL] Declare TEST_THEME_DIR in a single place.
https://bugs.webkit.org/show_bug.cgi?id=114285

Reviewed by Anders Carlsson.

.:

Instead of adding the `THEME_DIR' preprocessor variable in many
different CMakeList.txt files in the tree, declare it in
OptionsEfl.cmake so that we avoid needlessly duplicating code around.

While here, rename it to `TEST_THEME_DIR', which is the name used our
WebKit2 infrastructure, to better reflect the purpose of this value.

* Source/cmake/OptionsEfl.cmake: Add the TEST_THEME_DIR preprocessor
definition.

Source/WebKit2:

* PlatformEfl.cmake: Remove definition of `TEST_THEME_DIR', which is
now defined in OptionsEfl.cmake.

Tools:

Adapt to the renaming of `THEME_DIR' to `TEST_THEME_DIR'.

* DumpRenderTree/efl/CMakeLists.txt:
* DumpRenderTree/efl/DumpRenderTreeChrome.cpp:
(DumpRenderTreeChrome::createView):
(DumpRenderTreeChrome::createInspectorView):
(DumpRenderTreeChrome::initialize):
(DumpRenderTreeChrome::onDownloadRequest):
* EWebLauncher/CMakeLists.txt:
* EWebLauncher/main.c:
(findThemePath):
* EWebLauncher/url_bar.c:
(url_bar_add):
* MiniBrowser/efl/CMakeLists.txt:
* MiniBrowser/efl/main.c:
(window_create):
* TestWebKitAPI/PlatformEfl.cmake:
* TestWebKitAPI/efl/PlatformWebView.cpp:
(TestWebKitAPI::PlatformWebView::PlatformWebView):
* WebKitTestRunner/PlatformEfl.cmake:
* WebKitTestRunner/efl/PlatformWebViewEfl.cpp:
(WTR::PlatformWebView::PlatformWebView):

git-svn-id: http://svn.webkit.org/repository/webkit/trunk@148025 268f45cc-cd09-0410-ab3c-d52691b4dbfc