Remove GL-specific code from GMs and tests

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
index 3e1ef6c3d9d858a39bbb5f9f4652062738c1dab2..5a3c014413a1ac0ac4ae67af39806e123d1001de 100644
--- a/src/gpu/GrTest.cpp
+++ b/src/gpu/GrTest.cpp
@@ -13,12 +13,11 @@
 #include "GrResourceCache.h"
 #include "SkString.h"
 
-void GrTestTarget::init(GrContext* ctx, GrDrawTarget* target, const GrGLContext* gl) {
+void GrTestTarget::init(GrContext* ctx, GrDrawTarget* target) {
     SkASSERT(!fContext);
 
     fContext.reset(SkRef(ctx));
     fDrawTarget.reset(SkRef(target));
-    fGLContext.reset(SkRef(gl));
 }
 
 void GrContext::getTestTarget(GrTestTarget* tar) {
@@ -27,7 +26,7 @@ void GrContext::getTestTarget(GrTestTarget* tar) {
     // then disconnects. This would help prevent test writers from mixing using the returned
     // GrDrawTarget and regular drawing. We could also assert or fail in GrContext drawing methods
     // until ~GrTestTarget().
-    tar->init(this, fDrawingMgr.fDrawTarget, fGpu->glContextForTesting());
+    tar->init(this, fDrawingMgr.fDrawTarget);
 }
 
 ///////////////////////////////////////////////////////////////////////////////
@@ -236,6 +235,11 @@ private:
 
     void didRemoveGpuTraceMarker() override {}
 
+    GrBackendObject createBackendTexture(void* pixels, int w, int h,
+                                         GrPixelConfig config) const override { return 0; }
+    bool isBackendTexture(GrBackendObject id) const override { return false;  }
+    void deleteBackendTexture(GrBackendObject id) const override {}
+
     typedef GrGpu INHERITED;
 };