Reduce dependence on GrSurface's origin field

Unfortunately, GrGPU and its ilk are still using the GrSurface's origin a lot. I will clean that up in a second CL.

Change-Id: Iba729440ce8ea8d24bb7f4e5de55ed576a0f176d
Reviewed-on: https://skia-review.googlesource.com/24700
Commit-Queue: Robert Phillips <robertphillips@google.com>
Reviewed-by: Brian Salomon <bsalomon@google.com>
diff --git a/src/gpu/GrBitmapTextureMaker.cpp b/src/gpu/GrBitmapTextureMaker.cpp
index 762b72c..85e791e 100644
--- a/src/gpu/GrBitmapTextureMaker.cpp
+++ b/src/gpu/GrBitmapTextureMaker.cpp
@@ -37,7 +37,8 @@
     sk_sp<GrTextureProxy> proxy;
 
     if (fOriginalKey.isValid()) {
-        proxy = this->context()->resourceProvider()->findProxyByUniqueKey(fOriginalKey);
+        proxy = this->context()->resourceProvider()->findProxyByUniqueKey(
+                                                          fOriginalKey, kTopLeft_GrSurfaceOrigin);
         if (proxy) {
             return proxy;
         }
@@ -50,6 +51,7 @@
                                              dstColorSpace);
     }
     if (proxy && fOriginalKey.isValid()) {
+        SkASSERT(proxy->origin() == kTopLeft_GrSurfaceOrigin);
         this->context()->resourceProvider()->assignUniqueKeyToProxy(fOriginalKey, proxy.get());
         // MDB TODO (caching): this has to play nice with the GrSurfaceProxy's caching
         GrInstallBitmapUniqueKeyInvalidator(fOriginalKey, fBitmap.pixelRef());