Revert "Reduce dependence on GrSurface's origin field"

This reverts commit 467022b1861033d968195687da15270c208279ff.

Reason for revert: GrAHardwareBufferImageGenerator.cpp

Original change's description:
> 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>

TBR=bsalomon@google.com,robertphillips@google.com

Change-Id: I1b3f5c3b82d250ac164beb1d5c83abb6c3c6ab3b
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/25620
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/src/gpu/GrBitmapTextureMaker.cpp b/src/gpu/GrBitmapTextureMaker.cpp
index 85e791e..762b72c 100644
--- a/src/gpu/GrBitmapTextureMaker.cpp
+++ b/src/gpu/GrBitmapTextureMaker.cpp
@@ -37,8 +37,7 @@
     sk_sp<GrTextureProxy> proxy;
 
     if (fOriginalKey.isValid()) {
-        proxy = this->context()->resourceProvider()->findProxyByUniqueKey(
-                                                          fOriginalKey, kTopLeft_GrSurfaceOrigin);
+        proxy = this->context()->resourceProvider()->findProxyByUniqueKey(fOriginalKey);
         if (proxy) {
             return proxy;
         }
@@ -51,7 +50,6 @@
                                              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());