Reland "Reland "Have a GrBackendFormat be stored on gpu proxies.""

This is a reland of 2f9a5ea639925f38785f4d3a0af237822007cfd6

Original change's description:
> Reland "Have a GrBackendFormat be stored on gpu proxies."
> 
> This reverts commit 919c9e77c3492af766ff5982acda76ee49da3168.
> 
> Reason for revert: Flutter change has landed and fixed memory issue.
> 
> Original change's description:
> > Revert "Have a GrBackendFormat be stored on gpu proxies."
> >
> > This reverts commit 51b1c12bbc2fa3f8d4faa29ad19c6f3cb34837ce.
> >
> > Reason for revert: reverting till flutter gets to 1.1 to fix build issues.
> >
> > Original change's description:
> > > Have a GrBackendFormat be stored on gpu proxies.
> > >
> > > Bug: skia:
> > > Change-Id: Iaf1fb24ab29a61d44e5fa59a5e0867ed02dcda90
> > > Reviewed-on: https://skia-review.googlesource.com/c/168021
> > > Reviewed-by: Brian Osman <brianosman@google.com>
> > > Commit-Queue: Greg Daniel <egdaniel@google.com>
> >
> > TBR=egdaniel@google.com,bsalomon@google.com,brianosman@google.com
> >
> > Change-Id: I574fdc084ef5994596c51fb0d60423b5dc01b885
> > No-Presubmit: true
> > No-Tree-Checks: true
> > No-Try: true
> > Bug: chromium:903701 chromium:903756
> > Reviewed-on: https://skia-review.googlesource.com/c/169835
> > Commit-Queue: Greg Daniel <egdaniel@google.com>
> > Reviewed-by: Greg Daniel <egdaniel@google.com>
> 
> TBR=egdaniel@google.com,bsalomon@google.com,brianosman@google.com
> 
> Change-Id: Ifd9b6b8e194af9fb9258fa626644e76e6ecf090d
> Bug: chromium:903701 chromium:903756
> Reviewed-on: https://skia-review.googlesource.com/c/170104
> Commit-Queue: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Greg Daniel <egdaniel@google.com>
> Reviewed-by: Brian Osman <brianosman@google.com>

Bug: chromium:903701 chromium:903756
Change-Id: Id1360067d8e928b0a4e1848dae8bc1e7f1994403
Reviewed-on: https://skia-review.googlesource.com/c/171660
Reviewed-by: Greg Daniel <egdaniel@google.com>
Commit-Queue: Greg Daniel <egdaniel@google.com>
diff --git a/src/gpu/vk/GrVkImage.h b/src/gpu/vk/GrVkImage.h
index 7381e63..5240250 100644
--- a/src/gpu/vk/GrVkImage.h
+++ b/src/gpu/vk/GrVkImage.h
@@ -10,6 +10,7 @@
 
 #include "GrVkResource.h"
 
+#include "GrBackendSurface.h"
 #include "GrTypesPriv.h"
 #include "GrVkImageLayout.h"
 #include "SkTypes.h"
@@ -42,6 +43,9 @@
     VkImage image() const { return fInfo.fImage; }
     const GrVkAlloc& alloc() const { return fInfo.fAlloc; }
     VkFormat imageFormat() const { return fInfo.fFormat; }
+    GrBackendFormat getBackendFormat() const {
+        return GrBackendFormat::MakeVk(this->imageFormat());
+    }
     uint32_t mipLevels() const { return fInfo.fLevelCount; }
     const Resource* resource() const { return fResource; }
     bool isLinearTiled() const {