Create new target to hold gpu test code, enable direct testing of GrEffects in GM.

src/gpu/GrTest.cpp

Index: src/gpu/GrTest.cpp
diff --git a/src/gpu/GrTest.cpp b/src/gpu/GrTest.cpp
new file mode 100644
index 0000000000000000000000000000000000000000..934f089f3d6dce70bc850cbe24c56faeaccc1811
--- /dev/null
+++ b/src/gpu/GrTest.cpp
@@ -0,0 +1,37 @@
+
+/*
+ * Copyright 2013 Google Inc.
+ *
+ * Use of this source code is governed by a BSD-style license that can be
+ * found in the LICENSE file.
+ */
+
+#include "GrTest.h"
+
+#include "GrGpu.h"
+
+void GrTestTarget::init(GrContext* ctx, GrDrawTarget* target) {
+    SkASSERT(!fContext);
+
+    fContext.reset(SkRef(ctx));
+    fDrawTarget.reset(SkRef(target));
+
+    SkNEW_IN_TLAZY(&fASR, GrDrawTarget::AutoStateRestore, (target, GrDrawTarget::kReset_ASRInit));
+    SkNEW_IN_TLAZY(&fACR, GrDrawTarget::AutoClipRestore, (target));
+    SkNEW_IN_TLAZY(&fAGP, GrDrawTarget::AutoGeometryPush, (target));
+}
+
+void GrContext::getTestTarget(GrTestTarget* tar) {
+    this->flush();
+    // We could create a proxy GrDrawTarget that passes through to fGpu until ~GrTextTarget() and
+    // 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, fGpu);
+}
+
+///////////////////////////////////////////////////////////////////////////////
+
+void GrContext::setMaxTextureSizeOverride(int maxTextureSizeOverride) {
+    fMaxTextureSizeOverride = maxTextureSizeOverride;
+}