Revert "Remove origin field from GrSurface"

This reverts commit df0e09feacb29290fe94d37f921731b18f2edae0.

Reason for revert: Experimental revert to see if this is blocking the roll


Original change's description:
> Remove origin field from GrSurface
> 
> This mainly consists of rm origin from GrSurface and the wrapBackEnd*
> methods and then re-adding an explicit origin parameter to all the 
> GrGpu methods that need it.
> 
> Change-Id: Iabd79ae98b227b5b9409f3ab5bbcc48af9613c18
> Reviewed-on: https://skia-review.googlesource.com/26363
> Reviewed-by: Brian Salomon <bsalomon@google.com>
> Commit-Queue: Robert Phillips <robertphillips@google.com>

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

Change-Id: Id606aa01e84e2b83be71d833eefca477c1ad0d01
No-Presubmit: true
No-Tree-Checks: true
No-Try: true
Reviewed-on: https://skia-review.googlesource.com/29220
Reviewed-by: Robert Phillips <robertphillips@google.com>
Commit-Queue: Robert Phillips <robertphillips@google.com>
diff --git a/tests/TransferPixelsTest.cpp b/tests/TransferPixelsTest.cpp
index 722707a..daeaada 100755
--- a/tests/TransferPixelsTest.cpp
+++ b/tests/TransferPixelsTest.cpp
@@ -109,7 +109,7 @@
     REPORTER_ASSERT(reporter, result);
 
     memset(dstBuffer.get(), 0xCDCD, size);
-    result = context->getGpu()->readPixels(tex.get(), origin, 0, 0, kTextureWidth, kTextureHeight,
+    result = context->getGpu()->readPixels(tex.get(), 0, 0, kTextureWidth, kTextureHeight,
                                            config, dstBuffer.get(), rowBytes);
     if (result) {
         REPORTER_ASSERT(reporter, does_full_buffer_contain_correct_values(srcBuffer,
@@ -141,7 +141,7 @@
     REPORTER_ASSERT(reporter, result);
 
     memset(dstBuffer.get(), 0xCDCD, size);
-    result = context->getGpu()->readPixels(tex.get(), origin, 0, 0, kTextureWidth, kTextureHeight,
+    result = context->getGpu()->readPixels(tex.get(), 0, 0, kTextureWidth, kTextureHeight,
                                            config, dstBuffer.get(), rowBytes);
     if (result) {
         REPORTER_ASSERT(reporter, does_full_buffer_contain_correct_values(srcBuffer,