Have GrSurfaceProxys and GrGpuResources draw from the same pool of unique ids

src/gpu/GrSurfaceProxy.cpp

Index: src/gpu/GrSurfaceProxy.cpp
diff --git a/src/gpu/GrSurfaceProxy.cpp b/src/gpu/GrSurfaceProxy.cpp
index b8b5d7510d40f5f9e0e39d1228b24e953019a630..f5c401f6704918beee47fef8a7cd32d70a2ef3aa 100644
--- a/src/gpu/GrSurfaceProxy.cpp
+++ b/src/gpu/GrSurfaceProxy.cpp
@@ -7,13 +7,3 @@
 
 #include "GrSurfaceProxy.h"
 
-#include "SkAtomics.h"
-
-uint32_t GrSurfaceProxy::CreateUniqueID() {
-    static int32_t gUniqueID = SK_InvalidUniqueID;
-    uint32_t id;
-    do {
-        id = static_cast<uint32_t>(sk_atomic_inc(&gUniqueID) + 1);
-    } while (id == SK_InvalidUniqueID);
-    return id;
-}