Add immediate mode option for gpu configs in dm

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index aafb0b975a5b01f2d0e65b9d167f71d7e7e0d311..4adc3f7b7b770585a34e92729b3efe509c4c60e9 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -288,7 +288,7 @@ void GrContext::initMockContext() {
     SkASSERT(nullptr == fGpu);
     fGpu = new MockGpu(this, options);
     SkASSERT(fGpu);
-    this->initCommon();
+    this->initCommon(options);
 
     // We delete these because we want to test the cache starting with zero resources. Also, none of
     // these objects are required for any of tests that use this context. TODO: make stop allocating