Let DM run unit tests.

tests/Test.h

Index: tests/Test.h
diff --git a/tests/Test.h b/tests/Test.h
index 0a9c306b15963c4d1c611cbd13243f469c0c4edc..4d2cf2b6392349ed0751eb52274d3d219d27b7d9 100644
--- a/tests/Test.h
+++ b/tests/Test.h
@@ -62,9 +62,11 @@ namespace skiatest {
 
         static SkString GetTmpDir();
 
+        static void SetResourcePath(const char*);
         static SkString GetResourcePath();
 
         virtual bool isGPUTest() const { return false; }
+        virtual void setGrContextFactory(GrContextFactory* factory) {}
 
     protected:
         virtual void onGetName(SkString*) = 0;
@@ -79,11 +81,15 @@ namespace skiatest {
 
     class GpuTest : public Test{
     public:
-        GpuTest() : Test() {}
-        static GrContextFactory* GetGrContextFactory();
-        static void DestroyContexts();
+        GpuTest() : Test(), fGrContextFactory(NULL) {}
+
         virtual bool isGPUTest() const { return true; }
-    private:
+        virtual void setGrContextFactory(GrContextFactory* factory) {
+            fGrContextFactory = factory;
+        }
+
+    protected:
+        GrContextFactory* fGrContextFactory;  // Unowned.
     };
 
     typedef SkTRegistry<Test*(*)(void*)> TestRegistry;
@@ -162,7 +168,7 @@ namespace skiatest {
             name->set(#name);                                      \
         }                                                          \
         virtual void onRun(Reporter* r) SK_OVERRIDE {              \
-            name(r, GetGrContextFactory());                        \
+            name(r, fGrContextFactory);                            \
         }                                                          \
     };                                                             \
     static TestRegistry gReg_##name##Class(name##Class::Factory);  \