Update createWrappedRenderTargetProxy with BackendRT to work with lazy proxies.

This change also triggered a bunch of side changes thanks to WrappedProxyTest
fixing/improving how we handle wrapped proxies in genernal.

Bug: skia:
Change-Id: I743a458923cff1c2e947627d0e9154a4c808a668
Reviewed-on: https://skia-review.googlesource.com/108102
Commit-Queue: Greg Daniel <egdaniel@google.com>
Reviewed-by: Chris Dalton <csmartdalton@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
diff --git a/tools/gpu/GrTest.cpp b/tools/gpu/GrTest.cpp
index 06d9b83..c338680 100644
--- a/tools/gpu/GrTest.cpp
+++ b/tools/gpu/GrTest.cpp
@@ -305,6 +305,16 @@
 
 //////////////////////////////////////////////////////////////////////////////
 
+GrPixelConfig GrBackendTexture::testingOnly_getPixelConfig() const {
+    return fConfig;
+}
+
+GrPixelConfig GrBackendRenderTarget::testingOnly_getPixelConfig() const {
+    return fConfig;
+}
+
+//////////////////////////////////////////////////////////////////////////////
+
 #define DRAW_OP_TEST_EXTERN(Op) \
     extern std::unique_ptr<GrDrawOp> Op##__Test(GrPaint&&, SkRandom*, GrContext*, GrFSAAType)
 #define DRAW_OP_TEST_ENTRY(Op) Op##__Test