Enable blink_gc_plugin tests on Windows.

tools/clang/blink_gc_plugin/CMakeLists.txt

Index: tools/clang/blink_gc_plugin/CMakeLists.txt
diff --git a/tools/clang/blink_gc_plugin/CMakeLists.txt b/tools/clang/blink_gc_plugin/CMakeLists.txt
index c934ca0ff76a509b83acd1ea9ef4314f1287bdb2..590a3b7e4ddee49ec0430f5371b78865be324883 100644
--- a/tools/clang/blink_gc_plugin/CMakeLists.txt
+++ b/tools/clang/blink_gc_plugin/CMakeLists.txt
@@ -20,6 +20,12 @@ if(WIN32)
     list(APPEND absolute_sources ${CMAKE_CURRENT_SOURCE_DIR}/${source})
   endforeach()
   set_property(TARGET clang APPEND PROPERTY SOURCES ${absolute_sources})
+
+  cr_add_test(blink_gc_plugin_test

[Nico, 2015/05/14 05:34:19]

nit: If this doesn't pass yet, I'd probably add this in commented out with a "#
TODO: Enable once it passes".

(Dunno if the bots will even go red without that?)

[dcheng, 2015/05/14 05:39:55]

Since this is gated behind --run-tests (which the bots don't pass yet), I think
it's OK to leave this in.

WDYT?

+    python
+    ${CMAKE_CURRENT_SOURCE_DIR}/tests/test.py
+    ${CMAKE_BINARY_DIR}/bin/clang
+    )
 else()
   add_llvm_loadable_module("lib${LIBRARYNAME}" ${plugin_sources})
   add_dependencies("lib${LIBRARYNAME}" clang)