Revert of Start on simplifying generateGeometry() overrides

src/gpu/GrDrawTarget.cpp

Index: src/gpu/GrDrawTarget.cpp
diff --git a/src/gpu/GrDrawTarget.cpp b/src/gpu/GrDrawTarget.cpp
index 7ae2c99825109125117da824b5b99e9a52f1b7f3..850309797cf7d7e63b502aaaac2757dc4962e5a4 100644
--- a/src/gpu/GrDrawTarget.cpp
+++ b/src/gpu/GrDrawTarget.cpp
@@ -37,8 +37,16 @@
     fVerticesPerInstance    = di.fVerticesPerInstance;
     fIndicesPerInstance     = di.fIndicesPerInstance;
 
-    fVertexBuffer.reset(di.vertexBuffer());
-    fIndexBuffer.reset(di.indexBuffer());
+    if (di.fDevBounds) {
+        SkASSERT(di.fDevBounds == &di.fDevBoundsStorage);
+        fDevBoundsStorage = di.fDevBoundsStorage;
+        fDevBounds = &fDevBoundsStorage;
+    } else {
+        fDevBounds = NULL;
+    }
+
+    this->setVertexBuffer(di.vertexBuffer());
+    this->setIndexBuffer(di.indexBuffer());
 
     return *this;
 }