Partially defer GrSWMaskHelper

This is intended to position the writePixels in GrSWMaskHelper::toTexture for moving to GrSurfaceContext

Change-Id: I6c3d24eb3b1db3b0efc63f7f4f1240a7a00ee88a
Reviewed-on: https://skia-review.googlesource.com/6032
Reviewed-by: Brian Osman <brianosman@google.com>
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 7dd01de..6550342 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -593,6 +593,23 @@
     }
 }
 
+sk_sp<GrSurfaceContext> GrContextPriv::makeDeferredSurfaceContext(const GrSurfaceDesc& dstDesc,
+                                                                  SkBackingFit fit,
+                                                                  SkBudgeted isDstBudgeted) {
+
+    sk_sp<GrSurfaceProxy> proxy = GrSurfaceProxy::MakeDeferred(*fContext->caps(), dstDesc,
+                                                               fit, isDstBudgeted);
+
+    if (proxy->asRenderTargetProxy()) {
+        return this->drawingManager()->makeRenderTargetContext(std::move(proxy), nullptr, nullptr);
+    } else {
+        SkASSERT(proxy->asTextureProxy());
+        return this->drawingManager()->makeTextureContext(std::move(proxy));
+    }
+
+    return nullptr;
+}
+
 ////////////////////////////////////////////////////////////////////////////////
 int GrContext::getRecommendedSampleCount(GrPixelConfig config,
                                          SkScalar dpi) const {
@@ -639,7 +656,7 @@
 }
 
 sk_sp<GrRenderTargetContext> GrContextPriv::makeBackendTextureRenderTargetContext(
-                                                                   const GrBackendTextureDesc& desc, 
+                                                                   const GrBackendTextureDesc& desc,
                                                                    sk_sp<SkColorSpace> colorSpace,
                                                                    const SkSurfaceProps* props,
                                                                    GrWrapOwnership ownership) {