Refactor drawContext/RenderTarget creation

src/gpu/GrContext.cpp

Index: src/gpu/GrContext.cpp
diff --git a/src/gpu/GrContext.cpp b/src/gpu/GrContext.cpp
index 5ebb2e95fbf62c478db804e0e1254827a37e5689..a186bd87bc101f1cf9107ccc1903172adf354622 100644
--- a/src/gpu/GrContext.cpp
+++ b/src/gpu/GrContext.cpp
@@ -615,6 +615,37 @@ sk_sp<GrDrawContext> GrContext::drawContext(sk_sp<GrRenderTarget> rt,
     return fDrawingManager->drawContext(std::move(rt), surfaceProps);
 }
 
+sk_sp<GrDrawContext> GrContext::newDrawContext(BackingFit fit,
+                                               int width, int height,
+                                               GrPixelConfig config,
+                                               int sampleCnt,
+                                               GrSurfaceOrigin origin) {
+    GrSurfaceDesc desc;
+    desc.fFlags = kRenderTarget_GrSurfaceFlag;
+    desc.fOrigin = origin;
+    desc.fWidth = width;
+    desc.fHeight = height;
+    desc.fConfig = config;
+    desc.fSampleCnt = sampleCnt;
+
+    sk_sp<GrTexture> tex;
+    if (kTight_BackingFit == fit) {
+        tex.reset(this->textureProvider()->createTexture(desc, SkBudgeted::kYes));
+    } else {
+        tex.reset(this->textureProvider()->createApproxTexture(desc));
+    }
+    if (!tex) {
+        return nullptr;
+    }
+
+    sk_sp<GrDrawContext> drawContext(this->drawContext(sk_ref_sp(tex->asRenderTarget())));
+    if (!drawContext) {
+        return nullptr;
+    }
+
+    return drawContext;
+}
+
 bool GrContext::abandoned() const {
     ASSERT_SINGLE_OWNER
     return fDrawingManager->abandoned();