Move GraphicsContextTest to platform/ and fix the test environment.

Source/platform/testing/RunAllTests.cpp

 /*
  * Copyright (C) 2013 Google Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions are
  * met:
  *
  *     * Redistributions of source code must retain the above copyright
  * notice, this list of conditions and the following disclaimer.
  *     * Redistributions in binary form must reproduce the above
@@ skipping 12 matching lines @@
  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  * OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  */
 
 #include "config.h"
 
+#include "platform/TestingPlatformSupport.h"
 #include "wtf/CryptographicallyRandomNumber.h"
 #include "wtf/MainThread.h"
 #include "wtf/WTF.h"
 #include <base/test/test_suite.h>
 #include <string.h>
 
 static double CurrentTime()
 {
     return 0.0;
 }
 
 static void AlwaysZeroNumberSource(unsigned char* buf, size_t len)
 {
     memset(buf, '\0', len);
 }
 
 int main(int argc, char** argv)
 {
     WTF::setRandomSource(AlwaysZeroNumberSource);
     WTF::initialize(CurrentTime, 0);
     WTF::initializeMainThread(0);
+
+    WebCore::TestingPlatformSupport::Config platformConfig;
+    WebCore::TestingPlatformSupport platform(platformConfig);
+
     return base::RunUnitTestsUsingBaseTestSuite(argc, argv);
 }